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Equipment Discussions >> Refractors

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evilmedic13
member


Reged: 06/23/12

Loc: Chicago,Il
C6r focuser
      #5941820 - 06/26/13 05:37 PM

Okay, got a new C6r and want to add a new focuser. My only choices for the budget I have are the GSO crayford or WO focuser for synta scopes. As much as I'd love a moonlight or feathertouch, they are out of my range.

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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: C6r focuser new [Re: evilmedic13]
      #5941837 - 06/26/13 05:51 PM

You should at least consider this one: http://aokswiss.ch/d/komp/kasai/crayfort_kasai-borg.html

I have one on my Sky-Watcher 150mm f/8 achro and it's a superb focuser.



Adapters to fit it to the C6R are available from AOKswiss. You can also use the Baader Synta adapter they make for their Steeltrack focuser, it also fits the Kasai focuser and is the one I use on my Sky-Watcher.

http://www.baader-planetarium.de/sektion/s35/s35.htm#2_zoll_refr_zub

It's a very solid focuser. It holds my 2" Baader diagonal and 2" 30mm ES82 eyepiece in vertical without any problems. No need to lock the focuser tube down. Binoviewer with big eyepieces? No problems.


Clear skies!
Thomas, Denmark


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Messyone
sage


Reged: 05/02/12

Loc: Down Under
Re: C6r focuser new [Re: evilmedic13]
      #5941907 - 06/26/13 06:32 PM

I replaced mine with a GSO Linear bearing from Agena Astro. Well worth it, nice and solid very smooth, although the screws holding the steel track needed to be tightened up after a couple of months. Never had any problems with slipping etc. I use ES 100º eyepieces and do lots of binoviewing too.

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Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: C6r focuser new [Re: evilmedic13]
      #5942923 - 06/27/13 11:11 AM

evilmedic13,
I have a C6R & also wasn't happy with the OEM focuser. I replaced it with a GSO but had a very hard time getting it to balance out & stay inside my POD on a G11. I replaced that with the Moonlite and the balance was shifted rearward by 4" which pulled the objective back into the domes perimeter. The operation of both is much much better than the OEM POS. I personally like the Moonlite better as it can be retrofitted for motorized operation, but it ain't cheap.

Clear Dark Skies
Startraffic
39.138274 -77.168898


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KerryR
Carpal Tunnel
*****

Reged: 12/05/07

Loc: SW Michigan
Re: C6r focuser new [Re: Startraffic]
      #5943104 - 06/27/13 01:20 PM

If you're on a limited budget, consider overhauling the existing focuser. Removing the sticky grease and replacing it with something better, along with judicious tuning of screws can yield a very serviceable stock focuser.

Consider saving longer and purchase a collimateable focuser, such as those offered by Moonlite, at a later date. Generally, I've found the GSO focusers quite nice, if not a teeny bit finicky and often requiring cleaning and tuning of the planetary gears inside the focuser. Their greatest weakness, though, is the inability to easily collimate them. Luckily, the C6r's are very tolerant of collimation errors. In my case, the addition of a Chromacor required greater precision.

It's probably worth spending a little time with/on the stock focuser.


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Tommy5
Carpal Tunnel


Reged: 03/28/04

Loc: Chicagoland
Re: C6r focuser new [Re: KerryR]
      #5943492 - 06/27/13 05:33 PM

I bought a fairly cheap helical focuser from Orion for my C6R, works nice, I can get a rough focus from the stock focuser, and then fine tune the image at high mag without much shaking with the helical and a motor focuser will also work for visual observing.

Edited by Tommy5 (06/27/13 05:33 PM)


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Astrojensen
Post Laureate
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Reged: 10/05/08

Loc: Bornholm, Denmark
Re: C6r focuser new [Re: Tommy5]
      #5943513 - 06/27/13 05:47 PM

I don't like motor focusers, but the helical focuser is a nice idea.


Clear skies!
Thomas, Denmark


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Scott BeithAdministrator
SRF
*****

Reged: 11/26/03

Loc: Frederick, MD
Re: C6r focuser new [Re: evilmedic13]
      #5943869 - 06/27/13 09:52 PM

Quote:

Okay, got a new C6r and want to add a new focuser. My only choices for the budget I have are the GSO crayford or WO focuser for synta scopes. As much as I'd love a moonlight or feathertouch, they are out of my range.




Any chance of reworking your stock one for a temp fix, saving your pennies a bit longer, then getting a Moonlite?
I had the single speed Moonlite on my previously owned CR150 (C6R) and it completely transformed the scope.
If you plan on keeping the scope long term - it is worth saving for.


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tomharri
sage
*****

Reged: 09/19/08

Loc: USA
Re: C6r focuser new [Re: Scott Beith]
      #5943880 - 06/27/13 10:00 PM Attachment (25 downloads)

The William Optics bolts right on, no adapter needed.

The GSO Steeltrack.....ONLY 2" FOCUS TRAVEL !!!


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evilmedic13
member


Reged: 06/23/12

Loc: Chicago,Il
Re: C6r focuser new [Re: tomharri]
      #5944399 - 06/28/13 08:40 AM

Thanks Tom. Any need for extension tubes?

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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: C6r focuser new [Re: evilmedic13]
      #5944417 - 06/28/13 09:05 AM

There shouldn't be. I had a 2" WO focuser on my 150mm S-W for a while and didn't need any extension tubes when observing normally with a 2" diagonal. The WO focuser (which was borrowed from my WO72ED Megrez) was very nice, but a tad too long for me, as I couldn't reach focus with my binoviewer without barlow, which is why I changed to the Kasai crayford, since it's 30mm's shorter. The poor Megrez also wanted its focuser back.


Clear skies!
Thomas, Denmark


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tomharri
sage
*****

Reged: 09/19/08

Loc: USA
Re: C6r focuser new [Re: Astrojensen]
      #5950963 - 07/02/13 09:24 AM

I use 1.25" diagonals and every eyepiece has come to focus at the mid range of travel.

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spongebob@55
scholastic sledgehammer
*****

Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: C6r focuser new [Re: Scott Beith]
      #6040499 - 08/22/13 05:27 PM

Quote:

Quote:

Okay, got a new C6r and want to add a new focuser. My only choices for the budget I have are the GSO crayford or WO focuser for synta scopes. As much as I'd love a moonlight or feathertouch, they are out of my range.




Any chance of reworking your stock one for a temp fix, saving your pennies a bit longer, then getting a Moonlite?
I had the single speed Moonlite on my previously owned CR150 (C6R) and it completely transformed the scope.
If you plan on keeping the scope long term - it is worth saving for.



Scott,
Can you define what you mean by your comment, 'it completely transformed the scope'..... how did it transform it? I'm considering buying a new/used C6-R and am just trying to get all the information I can on it and any possible changes/upgrades (eek)
Thanks
Bob


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Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: C6r focuser new [Re: spongebob@55]
      #6044124 - 08/24/13 07:33 PM

Bob,
When I changed over to the 2spd Moonlite my C6r was also "transformed". Before the change, the OEM focusser wouldn't hold focus, had image shift, & had horrible backlash. The R&P system was really bad. The screws didn't have enough material to hold onto to keep the rack in place. I even tried epoxy to fix it, but it couldn't hold the 2 different materials. Since the Moonlite the focusing is buttery smooth, zero image shift, holds focus, and unexpectedly, the balance was shifted by 3-4in, bringing the objective inside of the perimeter of my 8ft POD. I liked the GSO that I had originally replaced the OEM with but to me, the focus always felt like it had sand in it. I eventually found & solved a slightly overtightened planetary bearing issue with it, & repurposed it onto an 90mmf4 IOptron I'm using as a guidescope.
I would like to say that for any OEM to make a piece of equipment of the quality of this (it IS a nice OTA, warts & all) and then to put a POS like that focusser is disgraceful. If a Newb were to buy this & try to use it they probably get discouraged or PO'ed because it couldn't perform to the hype, maybe even quit & they would be right. The optics are fairly decent for the aperture if you don't push the mag on bright objects there is (to my eyes) little CA seen in fast scopes. Even better would be to be able to columnate it. In quantity good quality components become inexpensive, and will let the observer grow without the equipment standing in the way.

Clear Dark Skies
Startraffic
39.138274 -77.168898


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spongebob@55
scholastic sledgehammer
*****

Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: C6r focuser new [Re: Startraffic]
      #6044985 - 08/25/13 11:10 AM

Quote:

Bob,
When I changed over to the 2spd Moonlite my C6r was also "transformed". Before the change, the OEM focusser wouldn't hold focus, had image shift, & had horrible backlash. The R&P system was really bad. The screws didn't have enough material to hold onto to keep the rack in place. I even tried epoxy to fix it, but it couldn't hold the 2 different materials. Since the Moonlite the focusing is buttery smooth, zero image shift, holds focus, and unexpectedly, the balance was shifted by 3-4in, bringing the objective inside of the perimeter of my 8ft POD. I liked the GSO that I had originally replaced the OEM with but to me, the focus always felt like it had sand in it. I eventually found & solved a slightly overtightened planetary bearing issue with it, & repurposed it onto an 90mmf4 IOptron I'm using as a guidescope.
I would like to say that for any OEM to make a piece of equipment of the quality of this (it IS a nice OTA, warts & all) and then to put a POS like that focusser is disgraceful. If a Newb were to buy this & try to use it they probably get discouraged or PO'ed because it couldn't perform to the hype, maybe even quit & they would be right. The optics are fairly decent for the aperture if you don't push the mag on bright objects there is (to my eyes) little CA seen in fast scopes. Even better would be to be able to columnate it. In quantity good quality components become inexpensive, and will let the observer grow without the equipment standing in the way.

Clear Dark Skies
Startraffic
39.138274 -77.168898





Hi John, I've got to say that post is one of the best detailed answers I've gotten on CN. And the graemlin use is great, too!
I've seen posts where people were happy with the stock, but recently, most people really say how much they like a replacement, and your detail is much appreciated. When I finally get a C6-R, I'll definitely test the stock one, and knowing me, go for an upgrade. I put a moonlite onto my 180mm Mak, and it really helps the focusing, the EP/diagonal rotation and its so darn smoooooth!
Regards,
Bob


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: C6r focuser new [Re: spongebob@55]
      #6045195 - 08/25/13 01:29 PM Attachment (15 downloads)

I put an AP focuser on mine. You can find them on Astromart used for ?$150? sometimes.

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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: C6r focuser new [Re: Mike Clemens]
      #6045199 - 08/25/13 01:30 PM Attachment (16 downloads)

It had a wonderful balance point afterwards. (Better than this with diagonal/eyepiece).

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Pete-LH
sage
*****

Reged: 03/25/09

Loc: Wilmington, DE
Re: C6r focuser new [Re: Mike Clemens]
      #6047013 - 08/26/13 01:31 PM

Mike,
I have been tempted to do this. Can you comment on the flange design you made/had made for the OTA tube?


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: C6r focuser new [Re: Pete-LH]
      #6047235 - 08/26/13 03:48 PM Attachment (6 downloads)

I had it made by aeroquest machining in Palmer, Alaska. Jim did an excellent job. It was a very lightweight adapter. The AP thread spec is on their website and it just slip fits into the tube.

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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: C6r focuser new [Re: Mike Clemens]
      #6047761 - 08/26/13 09:33 PM Attachment (6 downloads)

My 150mm Saxon ( Synta ) that my nephew is using in NZ has just fitted one to it , these are a very nice focuser once you set the tension via the 2 tiny allen head screws up under the body , takes 2 miniutes .
Brian.


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