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New Tak Eyepieces (cheap)

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#1 charlesgeiger

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Posted 07 October 2019 - 03:21 PM

I don't think anyone has these yet but I was wondering if these are really Tak quality?  Looks like they have the old UO type orthos and ramsdens.  Maybe made by same manufacturer as the originals?  The cheapest are $44.00 and that does seem below anything Tak would have made in the past.

Charlie



#2 nicoledoula

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Posted 07 October 2019 - 03:30 PM

Looks like you forgot to link to the eyepieces in question.


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#3 paul m schofield

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Posted 07 October 2019 - 03:50 PM

Go to the refractors forum. There is more information on the Starbase 80 topic.


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#4 CeleNoptic

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Posted 07 October 2019 - 04:01 PM

https://www.takahash...rands/starbase/

 

They call them "Starbase Or", 20, 18, 14, 9 and 6mm.

 

P.S. Here is the link to the Refractors forum but also not much info so far, just first  impressions.


Edited by CeleNoptic, 07 October 2019 - 04:09 PM.


#5 siriusandthepup

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Posted 07 October 2019 - 04:44 PM

I'll bet that they are not made in Japan.

 

I would love to hear different!



#6 markb

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Posted 07 October 2019 - 05:30 PM

Any relationship to the Baader BGOs and BCOs?

Love to see a comparison to both.

#7 Kunama

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Posted 07 October 2019 - 05:37 PM

They are from the same supplier that provides the Starbase 80, from Hanamaki, Japan, see them on Scopetown.jp for about $34. https://scopetown.co...08449/list.html

 

Seems that the only people calling these eyepieces and the Starbase 80  as being "Takahashi" are the USA dealers looking to improve their sales... C'est la vie....

 

Personally I would prefer the original F15 version of the scope: https://scopetown.co...P/HSDX8120.html


Edited by Kunama, 07 October 2019 - 05:42 PM.

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#8 CeleNoptic

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Posted 07 October 2019 - 08:52 PM

Any relationship to the Baader BGOs and BCOs?

Love to see a comparison to both.

 

Hmm... new Tak Abbe Orthos cost $100 more. The used BCOs are slightly above and the used BGOs are 2x+, so what do you expect?wink.gif


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#9 eros312

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Posted 07 October 2019 - 09:12 PM

They are from the same supplier that provides the Starbase 80, from Hanamaki, Japan, see them on Scopetown.jp for about $34. https://scopetown.co...08449/list.html

 

Seems that the only people calling these eyepieces and the Starbase 80  as being "Takahashi" are the USA dealers looking to improve their sales... C'est la vie....

 

Personally I would prefer the original F15 version of the scope: https://scopetown.co...P/HSDX8120.html

And if you scroll down on the first link you'll see that they aren't Abbe orthoscopics. That's why they're cheap. Abbe's need to be hand made, hence the high cost. See here https://scopetown.co.../entries/1.html


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#10 eros312

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Posted 07 October 2019 - 09:20 PM

I'll bet that they are not made in Japan.

 

I would love to hear different!

They are Japanese made. See the Scopetown link above. 


Edited by eros312, 07 October 2019 - 09:21 PM.

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#11 astro42

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Posted 07 October 2019 - 09:56 PM

Where can you purchase these?



#12 desertlens

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Posted 08 October 2019 - 12:07 AM

Where can you purchase these?

Here:

https://www.landseas...r&min=0&max=900



#13 nicknacknock

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Posted 08 October 2019 - 06:03 AM

Where can you purchase these?

Or here from Astronomics. The 5% CN member discount doesn't hurt at all wink.gif


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#14 lylver

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Posted 08 October 2019 - 07:33 AM

I was searching for some comfortable eyepiece, in fact with eye relief but I didn't find my prefered one so : I abandonned.

But still know the smallest fl I used comfortably was a edmund optics 12.5mm ortho-HD.

 

Here I see the ortho have the truncated volcano like top, like the RKE. For the short fl. the eye lens seems more near the surface, interesting.

I guess the 9mm to have enough eye relief and eye positionning capability, better perhaps than the 8mm RKE. I'll see if I brush the eye lens. wink.gif

 

The kellner too are not conventionnal : the 25mm has 18 mm eye relief instead of around 12mm. They may have modified the formula, this is interesting.

I have no doubt about behaviour when Takahashi writes this is a Kellner, it will behave at least as a Kellner, so not bad at f/10 ... or with a barlow.

They are also good eyepiece to match CVD (Chromatische Vergrosserung Differenz) of achromats from f/10 to f/16, making a final good color correction we used in microscopy before 1980.

 

With Takahashi brand, I am sure of a level of quality.

Maybe the formula is simpler glass (weight less) than the Abbe version so no short f/D (like f/7) with them. I will try with 70/900 or 90/1000 refractors and a f/8 mak newt.

 

----

Forget about one important availability : 14mm ortho is not common. It is in the Starbase 80 pack so should not be bad !


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#15 sg6

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Posted 08 October 2019 - 11:09 AM

Spec says 4 elements in 2 groups.

Sounds a lot like plossl's at least in basic configuration, may not be symetrical, but does a plossl have to be symetrical and throw in that Orthoscopic just means an image in correct and normal proportions and is not a given design or configuration then an Ortho could be almost any decent/good eyepiece.

 

An Abbe Ortho was a specific design/configuration from Abbe.

 

Still a few in a case will look impressive.

No one sells them here bawling.gif bawling.gif bawling.gif



#16 Astrojensen

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Posted 08 October 2019 - 11:45 AM

They are indeed of a plössl-like design. Nothing wrong with that, mind you, it's all in the execution.

 

 

Clear skies!
Thomas, Denmark


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#17 lylver

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Posted 08 October 2019 - 02:41 PM

They are indeed of a plössl-like design. Nothing wrong with that, mind you, it's all in the execution.

 

 

Clear skies!
Thomas, Denmark

Yes in the scope site I take from Kunama, they write Or. / PL

opl.jpg

If this is the design sketch this could cost much.

 

But; if this is cheap to build for a complex formula, it may be an evolution of the "Taylor symetric cheap plössl" that was good due to glass choice.

The two doublets were made with equi-convex crown and flat plano-concave flint.

 

I image this as this.

Equiconvex are easy to control at short fl., so the two crown are easy to figure well : goal is null spherical aberration with source at 2fl of the lens.

Plano-concave too are easy for the flat part and then easy to match to the convex with newton ring before cementing. Flat and same radius are easy to check with this.

Then, before end, controling and finish figuring the sky concave lens. first the surface to adjust the cemented part with newton rings.

Finish is done by adjusting the eyepiece chromatism, figuring/controling the last surface.

Not bad at all to reach high optical quality. But the glass formula may be hard to find.

Maybe searching the base formula "Abbe duplet" could help.

--------------------

Not Abbe duplet, more true plossl with 2 glass only.


Edited by lylver, 08 October 2019 - 06:10 PM.
switched topic

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#18 25585

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Posted 08 October 2019 - 04:56 PM

Spec says 4 elements in 2 groups.

Sounds a lot like plossl's at least in basic configuration, may not be symetrical, but does a plossl have to be symetrical and throw in that Orthoscopic just means an image in correct and normal proportions and is not a given design or configuration then an Ortho could be almost any decent/good eyepiece.

 

An Abbe Ortho was a specific design/configuration from Abbe.

 

Still a few in a case will look impressive.

No one sells them here bawling.gif bawling.gif bawling.gif

Teleskop Express sells Fujiyama Orthoscopics.  



#19 SandyHouTex

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Posted 09 October 2019 - 11:00 AM

I'll bet that they are not made in Japan.

 

I would love to hear different!

They are made in Japan.



#20 Kunama

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Posted 10 October 2019 - 03:33 AM

They are indeed made in Japan, but unlike the real Takahashi eyepieces, these with their safety groove may not work nicely in Tak eyepiece clamps....

 

All Tak eyepieces have smooth barrels and work well with the nylon rings in their clamps, safety grooves mean that you have to tighten the clamp several turns more.... 


Edited by Kunama, 10 October 2019 - 05:10 AM.

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#21 Nakedgun

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Posted 10 October 2019 - 11:22 PM

"safety" groove, indeed!

They should be abolished, altogether.


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