Maybe someone could identify this lens?

[computterman]

hello, i just got this lens (no engraved inscription) : front lens is approx.10cm diameter, it supposedly covers 12x20", there is an iris from f/4.5 to f/32
despite my researches I can't find any information about it, if someone could help

252279252281252280

thanx

[Jody_S]

If I had to guess, I would say it's a 16in telephoto lens for a WW2 aerial camera. I very much doubt it covers 12x20in, it was probably made to use on 5" wide roll film.

[computterman]

Do you think this is this kind of lens :

https://www.ebay.co.uk/itm/225831225428

[Dan Fromm]

No. The eBay seller posts strange listings. His lens has typical aerial lens stigmata: radial pins for attaching a spring-loaded filter holder and a filter holder, with red filter, that attaches to them.

The OP's lens lacks the pins, might be a lens for an aerial camera but the odds are against.

[computterman]

If I had to guess, I would say it's a 16in telephoto lens for a WW2 aerial camera. I very much doubt it covers 12x20in, it was probably made to use on 5" wide roll film.

yes it's a 16", i just measured the front lens exactly (93mm) and multiply by f/4.5 =16"

the image circle seems to be greater than 21x29,7cm, i'll take exact measures soon but i effectively doubt it covers 12x20", but sure, it covers more than 8x10"

[Jody_S]

No. The eBay seller posts strange listings. His lens has typical aerial lens stigmata: radial pins for attaching a spring-loaded filter holder and a filter holder, with red filter, that attaches to them.

The OP's lens lacks the pins, might be a lens for an aerial camera but the odds are against.

Some aerial cameras used filters (and especially heaters) on the camera itself, not the lens.

[Dan Fromm]

Some aerial cameras used filters (and especially heaters) on the camera itself, not the lens.

Please name one.

[Jody_S]

I don't remember which camera show I saw it at, but I saw pieces of one with a filter (shield?) with rear-window defrost style lines mounted to the camera cone, not the lens proper. I didn't buy it since I could not conceive of what one might do with such a thing other than put it on a shelf and dust it occasionally. Perhaps I lack imagination.

I would imagine any front-facing gun camera would find such an arrangement useful. Easier to clean or replace that than to touch the lens itself. But for all I know the thing I saw wasn't even from an aerial camera, it might have been some industrial thing.

[Dan Fromm]

Jody, thanks for jogging my memory. You prompted me to take out my Uran-27. It is an aerial camera lens, usually fitted to the AFA-39 camera. No filter threads, no radial pins. Here https://www.wikidata.org/wiki/Q127605195#/media/File:Russian_AFA_39_aerial_camera_with_URAN_lens_-_27;_2.5_-_10cm;_used_on_MIG17F;_MIG-19;_MIG-21;_Mil_Mi-8;_and_others.jpg is a photo of an AFA-39 with one fitted. The defrosting wires are very visible in the photo. How the heater is attached isn't clear.

Gun cameras (mainly shot 35 mm film) and reconnaissance cameras (6x6 and larger) are very different.

In my defense, in post #4 above, which you quoted in your post #6 above, I wrote "typical aerial lens stigmata." I don't think typical means all.

Cheers,

Dan

[Jody_S]

Thanks for making me doubt my own memory. I may not always remember the name of the street I live on, but by golly I can remember weird cameras.

[computterman]

I stripped the crumbling black paint and i discovered thos is a Dallmeyer 17" f4.5 Telephoto, i can see it's a petzval
but i found nothing about it on google

253148
253149