Help needed with device that Heligon 50/2 is mounted on

[chudy128314]

I bought Heligon 50/2 that is solid mounted on some "device". The device has focusing screen and no moveable parts. What is the purpose of this combo?


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[blotafton]

Strange.

[visualopsins]

My guess: telescope-like, it looks to me like a viewfinder.

[blotafton]

Its like one of those camera man fov visualization divices.

[chudy128314]

When I look through it, it behaves like viewfinder, but the image is upside-down. The device has Kodak logo, and "Made in Germany" inscription, so it's not some home-made thing. I'm really curious about it.

[Gamera]

The Kodak part is a close/macro -focusing device, likely parts of the whole system. I don't know of the Kodak system, but google Contaprox, it was a system for Contax rf-cameras.

If it is not intentionally fixed, the lens should come off.

[chudy128314]

Thanks to your clues I've finally found na answer - http://retinarescue.com/groundglassadapter.html. It helps you to set proper focusing distance. I still can't understand why one should use this .

[philslizzy]

Put the lens on the adapter, focus it, then transfer it back to the camera (taking care not to disturb the focus). Many companies made similar - and almost all of them were better!