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Great to see the differences! Thanks for the test!

Thanks Patric! That sounds like a possibility. There is no markings on the lens.

Hoping someone can help me identify this lens. Unfortunately these low res pictures are the only thing I have at this moment.
Maybe a Voigtländer 290mm?

249260
249261
249262
249263
249264

Thank you all for your thoughts and help with getting some details on this lens! Very much appreciated.

I've got all the information I need and will give everything some thought!

Thanks for the explanation!

That's what I was thinking. Contemplating building a camera myself and starting off with looking for some glass! Unfortunately the classic Petzfal brass lenses are out of my price range...
Haven't...

Thanks a lot Mark! That's some really useful info!
Looks like it has a smaller image circle then I was hoping for. Would have hoped to use it on 8x10".

I don't really understand the values in the...

Ok thanks, I was wondering if there was a more extensive catalogue from Perkin Elmer

That's the one!
I should have clarified I intend to use it for wetplate photography so not having a shutter, matching camera isn't a dealbreaker for me :)
Thanks for the other manufacturers names!...

That's a behemoth! No it's it's smaller brother:
248543

That would match the era! Any chance you could get me a copy of that catalogue?

Hi,

Is there anyone here that has given a Pacific Optical 18" F4 lens a try?
I struggle finding any information about the lens. It's from a Chicago Aerial KS-87B camera which uses 4.5x4.5" film....