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Bought another nice pair of plossls for BV.

eyepieces
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#1 25585

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Posted 22 August 2019 - 10:18 AM

A pair of TAL (Russian) 25mm plossls. These are the model BillP liked in his review https://www.cloudyni...er-plössl-r2844 .

 

They have bluish coatings as opposed to my other pair (originally adapted for Zeiss Diascopes), which had yellowish coatings.

 

I also have a very early TAL 25mm, also yellowish from the USSR era.

 

But the new pair are very bright and clear, barrel top eye lens mounting giving better eye comfort than any other 25mm plossl or Masuyamas I have tried. My CZJ 25s are nearly as good. 

 

Internal blacking is dense matt, no internal reflections or refractions. The newer 25s have rubber eyecups. Full FoV rolled back when wearing glasses, just right for my eye sockets without.

 

Getting ready for the Maxview II bino viewer next month......

 

Image not of mine but its just like mine. 

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Edited by 25585, 22 August 2019 - 10:28 AM.

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#2 Scott99

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Posted 22 August 2019 - 12:47 PM

interesting - did you buy these new?  It looks like they're available new here....

 

http://www.talteleop.../eyepieces.html



#3 John Huntley

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Posted 22 August 2019 - 02:46 PM

I've owned a few of those over the years.

 

With the eye lens right at the top of the optics housing they should suit you quite well.

 

Worth checking the field stop diameter - they varied through the years that the eyepieces were produced by TAL. I suspect that eye cup is a later addition by a previous owner - I did just the same to a couple that I owned - yours might be one of my old ones in fact !

 

Hop you did not paiy too much for them - I sold my last for just £15.00 !

 

The later versions of the TAL 100 achromat refractor changed coating colour as well, from deep purple to the greenish hue that Skywatcher achromats have.


Edited by John Huntley, 22 August 2019 - 02:51 PM.

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#4 25585

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Posted 22 August 2019 - 07:53 PM

Git them from Paralla selling on ebay UK. One one-owned vgc, the other new. Much more than  £15 each!  John, your buyer got a bargain!

 

The earlier symmetrical is sold by Microglobe. I am unsure of CN's TOS policy on links to anywhere with prices nowadays, but Google-able enough. 



#5 25585

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Posted 03 September 2019 - 12:36 AM

Specifications for the TAL plossls. Interesting to note the lens shapes of plossls at the top.  

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#6 25585

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Posted 03 September 2019 - 12:48 AM

Looking at the diagram below, comparing the TAL with "improved" and standard, TALs have more curving-out outer lenses. I assume this gives them, and particuarly the 25mm, better eye relief than others. 

 

With TV 40mm plossls, the 25mm TALs are the comfiest plossls to use. 

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  • image004 (1).jpg

Edited by 25585, 03 September 2019 - 12:53 AM.



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