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0.965 eyepiece sizes?

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#1 Bowlerhat

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Posted 08 November 2020 - 05:34 PM

What are some unusual sizes for a 0.965 eyepiece?

 

Usually the common sequence is: 5mm,6mm, 7mm, 9mm, 12.5mm, 20mm, 25mm, 32mm, 40mm

Unusual:  10mm, 12mm, 18mm, 

Rare: 2,8mm, 3mm, 4mm, 8mm, 14mm, 16mm, 23mm, 30mm

 

is this right? what else is there?

 

 


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#2 Bomber Bob

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Posted 08 November 2020 - 05:48 PM

KE 22 (Green Sears / AO Bundle) & SR 4

 

Sears (AO) 6 EP Set S02.jpg

 

spectros (Swiss 1980s): KE 15, KE 10, PL 7.5

 

spectros Eyepiece Set 20160721 S01.jpg

 

No picture (yet) but I have a Vixen OR 4


Edited by Bomber Bob, 08 November 2020 - 05:56 PM.

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#3 CharlieB

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Posted 08 November 2020 - 05:49 PM

My shortest .965" is a 3mm and longest is 50mm.  I have:

 

3,4,5,6,6.5,7,8,9,10,12.5,15,17,18,20,22,24,26,30,40 and 50mm f/l.  I could add a few microscope eyepieces at odd f/l equivalents but I won't.


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#4 TOMDEY

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Posted 08 November 2020 - 06:37 PM

Interesting topic!

 

 "The international standard microscope eyepiece tube diameter is 23 mm or about 0.9 in. Many stereo microscopes use eyepieces with a barrel diameter of 30 mm (1.2 in)"

 

I concocted the graph below from the literature and then added some of my favorites. Note especially the approx practical field stop cut-offs for standard sizes.

 

Another interesting factoid is that microscope eyepieces are designed for a feed coming from the objective of F/16 or slower. That's why they don't perform well on faster telescopes... even an F/10 SCT is apt to stress performance.

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#5 TOMDEY

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Posted 08 November 2020 - 06:38 PM

the graphic >>>

 

~click on~ >>>

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  • 46 EYEPIECE GRAPH absolute field drawtube 11 jpg Tom Dey.jpg

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#6 grif 678

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Posted 08 November 2020 - 06:40 PM

A good .965 barlow eyepiece will give you more options also.


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#7 Bowlerhat

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Posted 08 November 2020 - 07:46 PM

KE 22 (Green Sears / AO Bundle) & SR 4

 

attachicon.gifSears (AO) 6 EP Set S02.jpg

 

spectros (Swiss 1980s): KE 15, KE 10, PL 7.5

 

attachicon.gifspectros Eyepiece Set 20160721 S01.jpg

 

No picture (yet) but I have a Vixen OR 4

JW, which 4mm ortho do you have? I also got one, but there seems to be a lot of variations on this 4mm.

 

30
 
I got this 8mm HM, but Idk who manufactured it though. No marks at all.

 

 

My shortest .965" is a 3mm and longest is 50mm.  I have:

 

3,4,5,6,6.5,7,8,9,10,12.5,15,17,18,20,22,24,26,30,40 and 50mm f/l.  I could add a few microscope eyepieces at odd f/l equivalents but I wont.

Wow, had no idea of 50mm, who manufactured it?

 

I know takahashi has 3mm ortho, is there anyone who made it as well?


Edited by Bowlerhat, 08 November 2020 - 07:51 PM.

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#8 Bowlerhat

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Posted 08 November 2020 - 07:48 PM

A good .965 barlow eyepiece will give you more options also.

Back then they also have zooms and two in one, with goto for example 10-20mm. It is an interesting eyepiece.


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#9 Kasmos

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Posted 08 November 2020 - 08:25 PM

My Soligor came with a 50mm. CharlieB was probably also referring to the one that came with his Soligor.

Soligor EPS.jpg

Mine have no marks, his were marked ASA

CharlieB Soligor EPs.jpg

I believe he found that they were made by a different company using the Asahi name, not the one we associate with Pentax.

 

Chucks Soligor EPS.jpg

Chucks Soligor also came with a 50mm but his scope is likely a unmarked Towa

 

Also, besides the 18mm Kellner, Celestron once offered a 16mm Vixen Kellner.


Edited by Kasmos, 08 November 2020 - 08:28 PM.

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#10 Garyth64

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Posted 08 November 2020 - 09:06 PM

I have a H23mm eyepiece.  I don't remember where I got it.


Edited by Garyth64, 08 November 2020 - 09:08 PM.

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#11 Kasmos

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Posted 09 November 2020 - 04:10 AM

I have a H23mm eyepiece.  I don't remember where I got it.

Didn't they come with some of the Tasco 7TEs?

 

I have one and a 4mm that is from a Tasco 19T

23mm+Diagonal-4mm.jpg

The included diagonal is different and heavier than any .965" I've ever seen.

Note the large knurled barrel.


Edited by Kasmos, 09 November 2020 - 04:11 AM.

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#12 Garyth64

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Posted 09 November 2020 - 08:56 AM

Maybe there's a difference in eyepieces that came with the early 7TE scopes, and the later 7TE-2 and/or 7TE-5 models.

 

The original eyepieces that came with my 7TE-2 are domed-topped, HM6mm, HM12.5mm, and a H20mm.  The H23mm may have been on the early 7TE scopes like you said.


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#13 Paul Sweeney

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Posted 09 November 2020 - 10:53 AM

My Apollo 60/910 came with a 35mm. Nice eyepiece.
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#14 steve t

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Posted 09 November 2020 - 11:53 AM

This is a neat thread, I've always wondered if Zeiss ever made a .965" Kellner style eyepiece?



#15 Terra Nova

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Posted 09 November 2020 - 12:06 PM

In 0.965” orthos, I have 4, 5, and 6mm Unitron, 4 and 5mm Tani, and 6, 7 and 9mm Vixen. I sold my set of CZJ 0.965” orthos. BTW, I really like my 7 and 9mm Unitron Symmetricals.


Edited by Terra Nova, 09 November 2020 - 02:16 PM.

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#16 vahe

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Posted 09 November 2020 - 01:28 PM

It took me only 16 years to assemble these, Pentax SMC Orthos, in pairs, 6mm, 7mm, 9mm, 12mm & 18mm, and all came from used market, all were clean with no internal dust specs in them.

Pentax offered 5mm as well in this series but I decided not to get those due to short eye relief and also too much power with my long focus refractor.

I used 6mm extensively for the Red planet this past month, at 290x in binoviewer, just spectacular views.

I also used the 18mm for the Red planet with my Mak, at 277x the views were even more detailed, but the 16mm ZAO stole the show at 312x.

.

Vahe

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#17 CharlieB

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Posted 09 November 2020 - 01:29 PM

I guess I will add the microscope equivalents that I have after all.  These are mostly Zeiss and Nikon.  The 5x Zeiss is very similar to the ASA H 50mm with that same soda straw effect.  I have a full compliment of the B&L Hyperplanes, but they are not of the same optical quality as the Zeiss & Nikon - at least when used in a telescope.  The best of these is the Nikon 33x - truly exceptional eyepiece.

 

These give a nice selection of magnifications, albeit with a fairy narrow view.  The higher power microscope eyepieces are much more difficult to find, but the 20x and lower are readily found and can be very reasonably priced.

 

5x - 50mm

7.5x - 33.3mm

8x - 31.3mm
10x - 25.0mm
12.5x - 20.0mm
15x - 16.7mm
17x - 14.7mm
20x - 12.5mm
25x - 10mm
30x - 8.3mm
33x - 7.6mm


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#18 DeWayne

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Posted 09 November 2020 - 02:14 PM

I also have that 23mm Huygens.   Very solid lens, especially in a long refractor.   I like to use my when I do solar eyepiece projection.  Like most Huygens I've used,  it has to kept very clean because the lens design tends to emphasize any dirt or specs.  Of course, that also guarantees I'll see more  "sunspots"... lol.gif


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#19 Terra Nova

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Posted 09 November 2020 - 02:17 PM

I also have that 23mm Huygens.   Very solid lens, especially in a long refractor.   I like to use my when I do solar eyepiece projection.  Like most Huygens I've used,  it has to kept very clean because the lens design tends to emphasize any dirt or specs.  Of course, that also guarantees I'll see more  "sunspots"... lol.gif

i have a nice set of 20, 12.5, 9, and 6mm RAO Huygens 0.965” eyepieces that I like.


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#20 Bowlerhat

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Posted 09 November 2020 - 05:40 PM

I tried finding the image of Goto 12.5-25mm. I wonder if there's more of this size.

 

goto kogaku 2-in-1
 
Dossier
 
goto kogaku 2-in-1 dossier

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#21 Bomber Bob

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Posted 09 November 2020 - 06:03 PM

JW, which 4mm ortho do you have? I also got one, but there seems to be a lot of variations on this 4mm.

 

Mercy!  I'll have to dig it out.  IIRC, it came with my 1976 C5 Astro, but I think it's from the 1980s, based on the style & cosmetics.  Very short black cap. (V) on the chrome barrel...

 

CharlieB got me hooked on using high-quality microscope eyepieces -- especially for doubles, open clusters, and planetary.  Smaller fields, but usually very flat.  My very pretty machined & brushed aluminum B&L 25mm WF stays in my most-used accessory case.  Gotta test the 2 B&L's that I got recently in that Kludge-Fest box of stuff...

 

BIF:  Before I got my spectros 10-pc set from Xavier, these Meade Series 2 Orthos were my best .965" high-power eyepieces:

 

Meade S2 OR (3) Set S01.jpg

 

They're really just 1.25" Tani EPs threaded onto a reducing bushing...  Sweet Views (but they are Tani, after all).


Edited by Bomber Bob, 09 November 2020 - 06:06 PM.

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#22 Bowlerhat

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Posted 09 November 2020 - 06:06 PM

JW, which 4mm ortho do you have? I also got one, but there seems to be a lot of variations on this 4mm.

 

Mercy!  I'll have to dig it out.  IIRC, it came with my 1976 C5 Astro, but I think it's from the 1980s, based on the style & cosmetics.  Very short black cap. (V) on the chrome barrel...

 

CharlieB got me hooked on using high-quality microscope eyepieces -- especially for doubles, open clusters, and planetary.  Smaller fields, but usually very flat.  My very pretty machined & brushed aluminum B&L 25mm WF stays in my most-used accessory case.  Gotta test the 2 B&L's that I got recently in that Kludge-Fest box of stuff...

I've seen many recommendation for zeiss ones, maybe I'll try it someday..



#23 Astrobril

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Posted 17 November 2020 - 09:29 AM

I also have a H23mm. I got it with my first scope in September 1977 - a Tasco 9S. It was intended to be used in the Tasco 6621 6-18mm zoom eyepiece (circle T). I never liked the zoom eyepiece, too long to be used and as I recall, the views were so-so. The 23mm itself, however, is quite good.

DSC_0500.JPG


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#24 Bomber Bob

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Posted 17 November 2020 - 01:33 PM

I've seen many recommendation for zeiss ones, maybe I'll try it someday..

I have only 3 vintage Zeiss .965" eyepieces.  I don't use them much, as my spectros set is parfocal and just as good optically.  Unfortunately, it's next to impossible to find spectros eyepieces:  The company was acquired by Haag-Streit AG almost 30 years ago, and now they just make lenses & prisms -- no complete systems.  H-S AG seems to be primarily a medical instruments company...  When they do pop up, it tends to be on the German eBay.  Much easier to find CZJ accessories.

 

The only .965" eyepieces I've owned that came close to the CZJ & spectros were the GOTO set bundled with my Model 452.  But, I haven't used any vintage Nippon-Kogaku (Nikon), though it's said that GOTO used Nikon glass, FWIW...



#25 The_Vagabond

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Posted 17 November 2020 - 01:56 PM

Great thread. Going to follow this. Also, great graph up there. 




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