kuvvy
Well-known
Just got hold of an Isco Gottingen Tele-Westanar 135mm f3.5 that looks kind of interesting to play with. Its got 15 blades and I thought I'd like to try it on my Oly EM5 or OM1 but I'm not sure what mount it is. I know that some are in Exa, Edixa fit and M42 but this doesnt seem to be either. There is a thin ring at the rear which looks to be threaded and is the diameter of the lens, about 49mm. This looks more like a locking ring, perhaps to hold a mount.
Anyway, I have faith in you guys having the answer, no pressure then
Paul
Anyway, I have faith in you guys having the answer, no pressure then
Paul
Jack Conrad
Well-known
T-mount ?..............
kuvvy
Well-known
Nope it isnt T2 either, but thanks for the suggestion Jack.
Dwig
Well-known
T-mount would be 44mm with a finer pitch thread (0.75mm ?) than that of M42. It wouldn't be near 49mm.
@kuvvy: I would suggest setting the lens to infinity and throwing an image of the sun or some very distant object onto a light surface and measuring the distance from the image to the rear face of the lens. Given that measurement, you could consult one of the web pages that list the register distance (flange focal distance) of various mounts. It may be, though, that the rear mounting flange is missing. Since the lens was sold in both Exakta and M42 mounts it would have been engineered so that most of the lens would be identical in either mount with only the flange and auto-diaphram linkage changed. Knowing the measurement would give an idea if parts have been removed.
kuvvy
Well-known
I think there is a bit missing. Here are shots of the lens (not my pix)
http://www.ebay.co.uk/itm/Isco-Gott...90?pt=LH_DefaultDomain_77&hash=item58c6c6674e
chrishayton
Well-known
The lens in the photos appears to be Exakta Paul. Bring it in tomorrow. Interesting if its bayonet and not Exakta