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Equipment Discussions >> Refractors

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Denimsky
professor emeritus


Reged: 01/21/07

Loc: BC, Canada
Takahashi focusers
      #5601239 - 01/02/13 01:12 PM

I really hope Takahashi uses Feather Touch focusers or develops a new focusing system.

Their foucusers just aren't same league as their optics.
I had FS-102 and now I have TSA-102. Both focusers have noticeable image shifts. It is OK for visual but it isn't just ideal for imaging. Hack even for visual users should not suffer from the image shifts especially with these high end scopes.

I just read too many focser and CAA problems about TAK. Why does users have to tweak the fouser and CAA out of the box while paying that much money?
Also just see how many people (I included) use a Feather Touch micro focuser on their TAK focusers after paying so much money on their scopes.

At least I wish Takahashi gives us an option to buy their scopes without focusers so that I can save some money and use Feather Touch or Moonlite instead.

I love their scopes (I own three TAKs) but not the focuser.

Edited by Denimsky (01/02/13 01:33 PM)


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Mike Clemens
Frozen to Eyepiece
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Reged: 11/26/05

Loc: Alaska, USA
Re: Takahashi focusers new [Re: Denimsky]
      #5601257 - 01/02/13 01:23 PM

My 2005? FS128 NSV focuser left a lot to be desired. It had field rotation during focusing. That's how I ended up with this: http://www.pbase.com/mclemens1969/image/68846091/original
Fortunately, the NSV had tremendous in-focus so this worked well.


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Denimsky
professor emeritus


Reged: 01/21/07

Loc: BC, Canada
Re: Takahashi focusers new [Re: Mike Clemens]
      #5601274 - 01/02/13 01:37 PM

Quote:

My 2005? FS128 NSV focuser left a lot to be desired. It had field rotation during focusing. That's how I ended up with this: http://www.pbase.com/mclemens1969/image/68846091/original
Fortunately, the NSV had tremendous in-focus so this worked well.




Yes. Why do we have to do these? It is so frustrating.
I don't have much experience Asian focusers (like StellarVue, WO or Synta EON or Esprit ones) but I'm not even confident anymore that TAK 2.7" focusers are better than them. At least I don't see any image shifts from them.

I'm wondering TAK 4" is better but I also read the focuser flexure problem from another FSQ-106ED thread going on right now.

I think it is time to put some pressure on Takahashi (I don't think it will work though).

Edited by Denimsky (01/02/13 01:38 PM)


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Astrojensen
Post Laureate
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Reged: 10/05/08

Loc: Bornholm, Denmark
Re: Takahashi focusers new [Re: Denimsky]
      #5601307 - 01/02/13 02:03 PM

I had a chance to try some Tak scopes at ATT 2012 in Essen, Germany. The focuser on the 4" TSA-102 seemed to be superb, but the 4" focuser on the TOA 150 was, erm, not very impressive at all... The focuser on the FS-60 was also superb, but had very short travel. The focuser on the Sky-Watcher Esprit 150mm f/7 triplet was superb. I was also most impressed with the Astro-Physics rack and pinion focusers I tried.


Clear skies!
Thomas, Denmark


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Aquarist
scholastic sledgehammer


Reged: 08/27/12

Loc: Illinois
Re: Takahashi focusers new [Re: Astrojensen]
      #5601365 - 01/02/13 02:37 PM

I have a TOA 150 coming for which I have already ordered the Feather Touch replacement. Just the cost of doing business I guess, but what a PIA.

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M44
sage
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Reged: 03/24/07

Loc: SoCal.
Re: Takahashi focusers new [Re: Aquarist]
      #5601538 - 01/02/13 04:25 PM

I do agree with 'OP'. When comparing 2.7" focusers of AP and Tak scopes, There is too much gap in the capabilities.

Instead of improving Taks by going for CAA and FT pinion assembly, I would rather purchase a 3" FT focuser to have meaningful improvement.


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RAKing
Postmaster
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Reged: 12/28/07

Loc: West of the D.C. Nebula
Re: Takahashi focusers new [Re: Denimsky]
      #5601781 - 01/02/13 07:19 PM

Quote:

I really hope Takahashi uses Feather Touch focusers or develops a new focusing system.

Their foucusers just aren't same league as their optics.
I had FS-102 and now I have TSA-102. Both focusers have noticeable image shifts. It is OK for visual but it isn't just ideal for imaging. Hack even for visual users should not suffer from the image shifts especially with these high end scopes.

I just read too many focser and CAA problems about TAK. Why does users have to tweak the fouser and CAA out of the box while paying that much money?
Also just see how many people (I included) use a Feather Touch micro focuser on their TAK focusers after paying so much money on their scopes.

At least I wish Takahashi gives us an option to buy their scopes without focusers so that I can save some money and use Feather Touch or Moonlite instead.

I love their scopes (I own three TAKs) but not the focuser.




Yup - been there done that.

I also love Tak optics, but not their focusers. I talked to the guys at TNR and they said I could send the scope back to them for shimming, but I felt like I was using an SCT and sent my money to Starlight for a new FT3545. When I sold the scope, I kept the FeatherTouch and used it on my new scope.

Cheers,

Ron


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Pete-LH
sage
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Reged: 03/25/09

Loc: Wilmington, DE
Re: Takahashi focusers new [Re: Denimsky]
      #5601866 - 01/02/13 08:07 PM

Donghun,
I am almost glad to read this with a misery loves company slant to it.
I have an FS-102. I had read other reviews that describe it as buttery smooth and that is true if you relieve the tension. But at that tension it will not hold a 2" lens like the 35mm Panoptic. I have almost reached a compromised tension but in cold temperatures there is enough dimensional change that it will slip. I tried the FT 2 speed but FT does not supply a pinion and uses the Tak pinon which is a very soft metal and is not usually true. So this causes and uneven movement. I finally went back to the original focuser and use it with tension that will hold a 2" lens but it is not buttery smooth.
I am contemplating buyiing the complete feather touch unit because I love the optics.
NOTE: I think the tight tension is what causes the image shift.

ALSO NOTE: I do not have enough in focus on my FS-102 to handle the two focuser solution shown above.


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Svezda
scholastic sledgehammer


Reged: 06/01/07

Loc: Texas
Re: Takahashi focusers new [Re: Pete-LH]
      #5601946 - 01/02/13 08:52 PM

I have a 1995 FS-102 and the focuser looks and feels great...if you don't have an eyepiece heavier than, say, a 16NT5 + a diagonal in there...otherwise it slips down when the scope is aimed over, say, 35-45 degrees up (unless you tighten it up so much that you can't easily focus). These focusers look really high quality but the fact is that they will slip with heavier eyepieces with a diagonal. I wish we could get a special 'Tak look-alike' FeatherTouch model to replace them since I like the Tak looks and I don't think the FT is a good match aesthetically with Tak scopes.

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johnnyha
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Takahashi focusers new [Re: Svezda]
      #5601978 - 01/02/13 09:16 PM Attachment (95 downloads)

When I switched out my Tak focuser for an FT3545, I got lucky because Starlight Instruments had a special "shorty" adapter sitting around that they had made for a TOA130. It turns out the adapter was so short that the drawtube had to be sawed off an inch to prevent it hitting the last baffle of the TOA! After measuting the inside of my FS152 I realized the last baffle was inset at least 6" so I would have no problems. I have installed the FT3545 on my FS152 with this shorty adapter and could not be happier. Even with a standard "non-bino" tube I am able to reach focus with my MKV binos at 1X with 1/2" to spare... and with the long 4.5" drawtube I am also able to reach focus at 2.6X without adding an extension.

The focuser mechanically is perfect, a HUGE improvement over the stock Tak 4" focuse especially due to the ability to rotate the entire thing. It also has a beautiful finderscope holder that I have installed my Tak 7x50 finder into, and the finder rotates with the focuser. No image shift, no slop, this is one precision instrument. All for the same price of a 21mm Ethos.


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johnnyha
Postmaster
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Takahashi focusers new [Re: johnnyha]
      #5601984 - 01/02/13 09:21 PM Attachment (100 downloads)

Closer view...

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Pete-LH
sage
*****

Reged: 03/25/09

Loc: Wilmington, DE
Re: Takahashi focusers new [Re: johnnyha]
      #5602353 - 01/03/13 04:37 AM

Has anyone tried or know of someone who tried upgrading an FS-102 with a Baader SteelTrack Focuser?

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johne
sage
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Reged: 11/10/06

Loc: Prescott, AZ.
Re: Takahashi focusers new [Re: Astrojensen]
      #5602422 - 01/03/13 06:55 AM

Quote:

... but the 4" focuser on the TOA 150 was, erm, not very impressive at all...




Agreed. Not good at all. I replaced mine with a Feathertouch 3.5" dual-speed FTF3545B-A and the MicroTouch focusing kit. The conversion process, once I got the stock Tak focuser off (What a bear that was!), took only a few minutes. Yes, it was an expensive option to change it out, but what a difference the change made.


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Aquarist
scholastic sledgehammer


Reged: 08/27/12

Loc: Illinois
Re: Takahashi focusers new [Re: johne]
      #5602445 - 01/03/13 07:22 AM

Quote:

Quote:

... but the 4" focuser on the TOA 150 was, erm, not very impressive at all...




Agreed. Not good at all. I replaced mine with a Feathertouch 3.5" dual-speed FTF3545B-A and the MicroTouch focusing kit. The conversion process, once I got the stock Tak focuser off (What a bear that was!), took only a few minutes. Yes, it was an expensive option to change it out, but what a difference the change made.




Why was getting the stock Tak focuser off such a bear? Any tips about making that easier?


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johne
sage
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Reged: 11/10/06

Loc: Prescott, AZ.
Re: Takahashi focusers new [Re: Aquarist]
      #5602509 - 01/03/13 08:34 AM

Quote:

Why was getting the stock Tak focuser off such a bear? Any tips about making that easier?




According to Fred at Texas Nautical Instruments (TNR), it should not have been difficult. However, I bought my TOA150 used and who know what was done to it.

Fred suggested that I use a small-ish propane torch (like the small flame, refilable, hobby type torches) to warm the part of the focuser that screws onto the OTA. It worked like a charm and I don't see any permanent discoloration on the old focuser as a result of the warming.


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Aquarist
scholastic sledgehammer


Reged: 08/27/12

Loc: Illinois
Re: Takahashi focusers new [Re: johne]
      #5602617 - 01/03/13 09:47 AM

Quote:

Quote:

Why was getting the stock Tak focuser off such a bear? Any tips about making that easier?




According to Fred at Texas Nautical Instruments (TNR), it should not have been difficult. However, I bought my TOA150 used and who know what was done to it.

Fred suggested that I use a small-ish propane torch (like the small flame, refilable, hobby type torches) to warm the part of the focuser that screws onto the OTA. It worked like a charm and I don't see any permanent discoloration on the old focuser as a result of the warming.




thanks much! Never heard of that problem, but I like the solution.


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johnnyha
Postmaster
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Takahashi focusers new [Re: Aquarist]
      #5602801 - 01/03/13 11:39 AM

I got my stock focuser off my FS152 with a leather belt.

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payner
scholastic sledgehammer
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Reged: 03/22/07

Loc: Bluegrass Region, Kentucky
Re: Takahashi focusers new [Re: johnnyha]
      #5602965 - 01/03/13 01:02 PM

I have a new TSA-120 and had it out for first light last night. I used a 21 mm ethos and was very pleased with the Tak focused; it has the 7:1 micro-focuser. I have a FT on my FS-152 and honestly the two are comparable in my estimation.

Best
Randy


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ryderc1
sage
*****

Reged: 04/15/06

Re: Takahashi focusers new [Re: Aquarist]
      #5603196 - 01/03/13 03:11 PM

I assume you loosened the tiny set screw on the outer flange of the Tak focuser housing before removing the focuser?


Quote:

Quote:

Quote:

... but the 4" focuser on the TOA 150 was, erm, not very impressive at all...




Agreed. Not good at all. I replaced mine with a Feathertouch 3.5" dual-speed FTF3545B-A and the MicroTouch focusing kit. The conversion process, once I got the stock Tak focuser off (What a bear that was!), took only a few minutes. Yes, it was an expensive option to change it out, but what a difference the change made.




Why was getting the stock Tak focuser off such a bear? Any tips about making that easier?




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Mike Clemens
Frozen to Eyepiece
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Reged: 11/26/05

Loc: Alaska, USA
Re: Takahashi focusers new [Re: johnnyha]
      #5603227 - 01/03/13 03:24 PM

That's a dream setup!

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Smack
super member


Reged: 07/24/09

Re: Takahashi focusers new [Re: Mike Clemens]
      #5603568 - 01/03/13 07:25 PM

I have a TSA-102 with the Feather Touch pinion retrofit and a CAA. I image with this setup (SBIG ST-8300M with filterwheel, various and sundry extensions and a TS-OAG9 and Orion SSAG on the back end). I've not noticed any sag with this setup.

Regards,

Steve


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CounterWeight
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Reged: 10/05/08

Loc: Palo alto, CA.
Re: Takahashi focusers new [Re: Smack]
      #5604199 - 01/04/13 07:50 AM

i take a wait and see approach. i was plenty happy with the small focuser on my TOA130(s) version, held my ep's and SSPv2 for imaging just fine. There was at same time a larger focuser version for more $$ that I've no experience with. I've now had 3 diiferent FS Tak's and I've been happy with the focusers - 2 had the 10:1 mod but I'm unsure it's really reqired - no imaging but very happy with them for visual. I agree too that it's not just great optics that make a great imaging scope, the focuser is equally critical in all respects.

My TEC has the FT3545 and it's my reference point for a great focuser.

This frequent focuser questions I see... interesting to me and I'm wondering if I am understanding correctly - it's only an issue when not locking the focuser using moto focus setups? Not if the focuser is locked? I've been dreaming of getting an FSQ-106 or 85 - for imaging who doesn't? but i'd like to be clear on if it's an issue ONLY when using motorized focus, and that the user available adjustments aren't sufficient.

Thanks.


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etsleds
sage
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Reged: 11/14/09

Re: Takahashi focusers new [Re: johnnyha]
      #5606034 - 01/05/13 05:11 AM

Boy oh boy she's looking prettier than ever. Hope you're having a great time with great views!

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Pete-LH
sage
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Reged: 03/25/09

Loc: Wilmington, DE
Re: Takahashi focusers new [Re: CounterWeight]
      #5606087 - 01/05/13 07:35 AM

My issue is just with visual/manual focusing. I can adjust the focus tension with the bottom plate so that it is smooth. But (especially) when I observe in cold weather and I have a heavy lens in like a 35mm 2" Panoptic, the focus tube will slip when observing towards Zenith. I can adjust the tension to overcome this, but then at high magnification the image will shift when fine tuning the focuser.
Probably I have just not found that optimum yet and the issue is with my ineptitude. It's not a big enough problem that I don't enjoy using my FS-102. Just looking for that perfect place.


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johnnyha
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Takahashi focusers new [Re: etsleds]
      #5606579 - 01/05/13 01:02 PM

Quote:

Boy oh boy she's looking prettier than ever. Hope you're having a great time with great views!



Yes I am Andrew! Happy New Year!


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tomcody
Pooh-Bah
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Reged: 07/06/08

Loc: Titusville, Florida
Re: Takahashi focusers new [Re: Pete-LH]
      #5610630 - 01/07/13 05:51 PM

Quote:

My issue is just with visual/manual focusing. I can adjust the focus tension with the bottom plate so that it is smooth. But (especially) when I observe in cold weather and I have a heavy lens in like a 35mm 2" Panoptic, the focus tube will slip when observing towards Zenith. I can adjust the tension to overcome this, but then at high magnification the image will shift when fine tuning the focuser.
Probably I have just not found that optimum yet and the issue is with my ineptitude. It's not a big enough problem that I don't enjoy using my FS-102. Just looking for that perfect place.



Pete,
Are you using this method to adjust your focuser:
1. loosen the pinion pressure on the rack
2. loosen the glue on the three small allen screws located along the top of the focuser with acetone ( I use a drop of nail polish remover on a toothpick)
3. tighten those three screws , center first, then front then back until the focuser tube feels right
4. adjust the tension on the pinion
Done
Note this works best if the focuser tube has been removed, old grease cleaned and a very thin coat of new grease applied.
Rex
P.S. Anyone know what grease Takahashi uses?


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tomcody
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Reged: 07/06/08

Loc: Titusville, Florida
Re: Takahashi focusers new [Re: Denimsky]
      #5610717 - 01/07/13 06:52 PM

I beleive that Tak focusers reqiure fairly frequent adjustments to stay tight and precise. They are designed to be adjustable and this is a plus for them.
The OP mentioned CAA adustments and from my experiance those are mostly due to the grease in them either drying out and getting stiff or spreading and leaving play in the CAA.
The one issue that I see with the design Takahashi uses is that the focuser housing is thick cast material and the focuser tube is thin, probably extruded material and the mass and density differences between the two allow changes in temperature to affect clearances.
Rex


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tomcody
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Reged: 07/06/08

Loc: Titusville, Florida
Re: Takahashi focusers new [Re: tomcody]
      #5720374 - 03/08/13 11:56 AM Attachment (52 downloads)

For anyone interested, Starlight has just come up with a one piece adapter for the TSA102/FS102 and the FT3035 focuser. And there may be more new adapters coming (at Neaf? ) .
I just got my 3035 and adapter for the FS012 and will post soon as to comparative lengths and weights of the two. For a quick synopsis, the FT is al lot shorter given that it has a rotator built in (don't need the Tak CAA) and the FT 2" nosepiece adapter is about 15mm shorter than the Tak version. All this matters on the FS102 if you bino, not so much on the TSA102 as it has 30mm more in-focus than the FS. More to come.
Rex


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Gardner
scholastic sledgehammer
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Reged: 01/19/04

Loc: New Hampshire
Re: Takahashi focusers new [Re: tomcody]
      #5721078 - 03/08/13 07:29 PM

My FSQ-106N had a small amount of shift to it, it tended to rotate about 1-2 millimeters with a change of direction. The Tak fine focus accessory helped a little, I could focus slowly with the fine knob and not see any shift.

I admit I was a bit disappointed in the focuser given that the optics were so darn good.

Going to the F-T might cost a bundle, but the Tak-specific spacers and adapters don't come cheap either.


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andysea
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Reged: 09/03/10

Loc: Seattle, WA
Re: Takahashi focusers new [Re: Gardner]
      #5721120 - 03/08/13 08:17 PM

I have the TOA130NS with the 2.7" focuser 2010 S/N. I'm definitely not happy with the stock focuser. I can adjust it and remove the slop but it will be very tight to turn. If I make it smooth then I have slop and image shift.
I also have the FSQ105EDX III and its 4" focuser is way better. Very solid, no slop and very smooth to adjust with no image shift.
I think eventually I will have to replace the TOA's focuser with either a Moonlite or a feathertouch. I am leaning towards the Moonlite because they have a focuser with the takahashi thread size drawtube so that I will be able to use all my accessories.


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tomcody
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Reged: 07/06/08

Loc: Titusville, Florida
Re: Takahashi focusers new [Re: andysea]
      #5721181 - 03/08/13 08:51 PM

The FT3035 has a 72mm end cap available so you can use Tak adapters.

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tomcody
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Reged: 07/06/08

Loc: Titusville, Florida
Re: Takahashi focusers new [Re: tomcody]
      #5722000 - 03/09/13 10:46 AM

As an addendum to my post above, here is a more complete description of adjusting the Tak 2.7" focuser:

To adjust it properly, you must first remove the cover from the rack and pinion. by unscrewing the small flat chrome screw on the bottom of the focuser (use a bent paper clip in the shape of a U or a pair of sharp tipped tweezers as a spanner wrench to loosen that chrome screw. Then remove the cover over the rack gears and LOOSEN the two screws that tighten the tension clearance on the gears ( you will need a small #3 Phillips head screw driver, get the clearance loose and sloppy, but still able to turn the focuser knobs and move the focuser in and out.

(WHY? The three screws along the top of the focuser adjust the play in the focuser tube by pressing the tube against the bottom of the focuser housing, if you do not loosen the pinion gear shaft, you are just pressing the focuser tube against the pinion gear, not the bottom of the focuser housing).

NOW adjust the three small allen hex screws along the top of the focuser (use a tiny drop of acetone to loosen the glue holding them) they take a 1.5mm allen wrench. Adjust the three screws while turning the focuser knob in and out until all slop in the focuser tube is removed and the tube still slides in and out without binding. (Start with the middle screw, then the front screw, then back screw).
Now go back and tighten the two phillips screws on the rack until you do not feel any slop when reversing direction of the focuser knob AND the rack moves smoothly without binding, (DO not over tighten this adjustment as it will cause rough movement and binding of the gears, also slop will only be felt as looseness or back lash in the gears and not hurt the scope movement, so a little loose is beter than too tight).
Replace the cover and screw and you are done.

EDIT: A few more points, the glue used to secure the three screws along the top of the focuser will re-dry in about an hour (if you don't use too much acetone to loosen them, if the stay loose? just use a drop of clear nail polish to re-secure them.
Let me know how this works for you?
Rex

Edited by tomcody (03/09/13 06:07 PM)


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andysea
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Reged: 09/03/10

Loc: Seattle, WA
Re: Takahashi focusers new [Re: tomcody]
      #5722511 - 03/09/13 03:44 PM

Thanks for the very complete explanation! I am going to try it this afternoon.
I will also look into the Feathertouch. If it comes with the Tak adapter that might be the way to go.

Andy


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andysea
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Reged: 09/03/10

Loc: Seattle, WA
Re: Takahashi focusers new [Re: tomcody]
      #5737488 - 03/16/13 10:23 PM

Rex,
I followed your procedure and adjusted the focuser. It's a lot better now! I am waiting for a focusing motor. Once I get it installed I will be able to test it and see if the focuser is adequate for imaging. I actually don't detect any slop and it's smooth to turn. There is no play in the rack and pinion. Since I had it taken apart I also regreased it:)

Andy


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timps
sage


Reged: 02/24/13

Re: Takahashi focusers new [Re: tomcody]
      #5738034 - 03/17/13 05:22 AM

A handy thing to know but one shouldn't have to go to these lengths after paying $6K - $7K on a premium instrument. It should be faultless. After all, Takahashi claim their instruments are quality.

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chboss
professor emeritus


Reged: 03/24/08

Loc: Zurich Switzerland
Re: Takahashi focusers new [Re: timps]
      #5738245 - 03/17/13 09:22 AM

There will always be some tolerances.... even with high quality manufacturers some QC mishaps will happen or the focuser may develop some play when in constant use. As long as the focuser is adjustable to fix the problem I see no real issue.

Show me a car that is faultless after a few years of use and they tend to cost you a lot of money....

best regards
Chris


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Stellarfire
Pooh-Bah


Reged: 07/10/11

Loc: Switzerland
Re: Takahashi focusers new [Re: chboss]
      #5738499 - 03/17/13 12:20 PM

Quote:

There will always be some tolerances.... even with high quality manufacturers some QC mishaps will happen or the focuser may develop some play when in constant use. As long as the focuser is adjustable to fix the problem I see no real issue.

best regards
Chris





Fully agreed.

But Takahashi should improve the tech manual situation. A lot of international Tak customers out there would be grateful to see written detailed step-by-step instructions in English language.

Stephan


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tomcody
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Re: Takahashi focusers new [Re: Stellarfire]
      #5738612 - 03/17/13 01:24 PM

Quote:

Quote:

There will always be some tolerances.... even with high quality manufacturers some QC mishaps will happen or the focuser may develop some play when in constant use. As long as the focuser is adjustable to fix the problem I see no real issue.

best regards
Chris





Fully agreed.

But Takahashi should improve the tech manual situation. A lot of international Tak customers out there would be grateful to see written detailed step-by-step instructions in English language.

Stephan



While I agree that better manuals would be nice, they may be at odds with keeping the importers/repairs stations in business, I am sure that adjustments and collimations generate a lot of the business for the repair stations and without that, I doubt that warrantee work alone would keep them open.
Rex


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andysea
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Re: Takahashi focusers new [Re: timps]
      #5739377 - 03/17/13 06:45 PM

Quote:

A handy thing to know but one shouldn't have to go to these lengths after paying $6K - $7K on a premium instrument. It should be faultless. After all, Takahashi claim their instruments are quality.




I tend to agree with this statement. Plus the focuser is not the same quality as my Moonlite. It does not use bearings like my Moonlite and it's not as smooth. I suspect that there will always be a small amount of flex. Perhaps not detectable by wiggling the drawtube but most likely detectable by a CCD.
I am going to use it for a while as is and then decide whether or not to upgrade. I have to add that my TOA is a 2010 model, was upgraded to current production by TNR but I doubt that they also adjusted the focuser. Perhaps it went a little off with use. Even tho it's only been used a handful of times.


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chboss
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Reged: 03/24/08

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Re: Takahashi focusers new [Re: Stellarfire]
      #5740081 - 03/18/13 04:32 AM

Quote:

But Takahashi should improve the tech manual situation. A lot of international Tak customers out there would be grateful to see written detailed step-by-step instructions in English language.




You have a valid point regarding the documentation. It is a general weakness of Japanese companies since they mostly focus on their local market. Sometimes they just do not have english speaking staff to translate the manuals..... the result is sub par documentation unless one of the international distributors takes things in its own hands.
This is unfortunately not an isolated issue for telescopes but a general thing I observe....

best regards
Chris


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somfawa
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Re: Takahashi focusers new [Re: chboss]
      #5826550 - 04/27/13 03:27 PM Attachment (31 downloads)

I had the same sideways slop with my NSV. I traded up from an older FS102 which had zero slop and which wasn't particularly set tight. The NSV would slop even with the 3 screws done up to a point where the tube would hardly move. This is actually bad for the gears in my opinion and should be avoided. Anyway, on investigating the mechanics of the rack and pinion I wasn't surprised there was sideways movement due to the teeth on the rack being angled (helical design): the pinion pushes the rack in the direction of the angle. I was now surprised my older Tak didn't have the issue.
On taking it apart and having a look at ways of fixing it I decided a couple of plastic guides wedged between the rack and those two sliders/pressure points in the housing would maybe work. They would stop any sideways movements of the rack but allow it to move in and out. The focuser housing has an internal diameter of 80mm so I found an 80mm plastic drainpipe and set about making a couple of small guides. It took 3 attempts but I finally got it right and now my focuser has zero slop. And I don't have to tighten it down hard.

It wasn't easy as the plastic was 0.5mm too thick and had to be ground down with a dremel - the aim was to not have it dragging on the drawtube surface, just the rack. I originally expected to glue them in place but in the end there was no need as they just sit tight within the housing doing their job. Worth it but difficult.

The holes in the guides are to accommodate a raised section in the focuser, but this actually helps to keep the guides in place without glue. That was another task for the dremel.


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The Ardent
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Re: Takahashi focusers new [Re: somfawa]
      #5827534 - 04/27/13 11:53 PM

I just picked up a FS-78 and want to replace the focuser. It works but has the slippage under load. I also want the fine focus. Feathertouch or Moonlite?

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Gary BEAL
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Reged: 05/10/03

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Re: Takahashi focusers new [Re: The Ardent]
      #5827626 - 04/28/13 01:18 AM

I have a Feather Touch 2025 on my FS-78, partly because the bog standard wasn't good enough to me (plus it had a slightly bent pinion shaft), but mainly as I want motor focus for solar. I got an adaptor made in HK, simple as.
Having said that, my "nephew" Ron at Moonlite "may" have a ready made screw on adaptor, ask him. Starlight didn't have anything plug/screw and play.
Gary


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