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Zeiss,yes, With old school GPC or built in barlow?

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#1 cavefrog

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Posted 27 September 2013 - 10:40 PM

These are a pair of Zeiss binos purchased a while back. They work in 2 receivers. most of the time only with a barlow in refractors. which has me scratchin" ma noggin a bit. In the 2" nose is a pair of doublets, that I would think would be a GPC or a barlow. but either one of those would make a pair of binos useable in a refractor. but these do not. I still need a barlow or GPC to come to focus in a refractor. except for my 120 "MUTT" that has a removable spacer in the focuser that will bring ANY bino to focus. I finally got this thing apart today (3rd try!) and found that pulling both doublets out and exposing the prisms, that putting it in a big barlow makes it work very nicely. I also tried it with and without a barlow, using only the first doublet. The image was focused? somewhat but terrible. some parts focused and others not. lastly. with both doublets in and using the big barlow, I could come to good focus again, but it makes a huge magnification.

Is anyone familiar with this model? I am leaning towards a built in barlow, and not a GPC, but I still do not understand why it will not come to focus in a refractor without a barlow in place.

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#2 cavefrog

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Posted 27 September 2013 - 10:41 PM

The other end.

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#3 cavefrog

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Posted 27 September 2013 - 10:43 PM

first doublet next to prism

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#4 cavefrog

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Posted 27 September 2013 - 10:46 PM

order of lenses

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#5 cavefrog

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Posted 27 September 2013 - 10:49 PM

If it matters, both doublets have the convex side facing forward (out towards objective).

Theo

#6 cavefrog

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Posted 29 September 2013 - 10:22 PM

nobody has ever seen this?

#7 cavefrog

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Posted 30 September 2013 - 04:47 PM

Well, I tried these in a bino friendly scope that has a removable section for bino use. In two different manners. With the doublets in place, and without. The only difference I can determine is a distance of 1/2" of the focuser.

So why are these mounted in this bino?

#8 cavefrog

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Posted 24 October 2013 - 11:04 PM

Anybody have any answers to this yet?






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