Hello!
Is the front element of Aero Ektar (cemented doublet and spaced lens) producing any image?
Thanks.
Hello!
Is the front element of Aero Ektar (cemented doublet and spaced lens) producing any image?
Thanks.
Take off the rear element and try to focus the front and then you will have your answer.
Thanks, it works!!!
If serious, I have no Aero Ektar, just going to buy it. So need to know how the front element works. As I understand this is a tele lens, so the rear group should be a negative and front group should be a solo lens. But may be I'm wrong.
Not a tele lens. A more or less symmetrical double Gauss type. Why do you think it is a tele?
Oh, and by the way, the 7"/2.5 Aero Ektar's flange focal distance is a bit shorter than focal length. This is normal for double Gauss types, which are often a bit telephoto. But tele lenses in the conventional sense they are not.
Thanks! I found Aero Ektar description and scheme. It's really close to double gauss.
can anyone who has a ektar 2.5 let me know if the lens is meant to have a rear element? as mine doesnt seem to have one.. (i havent tested it yet still waiting on a jolo board to come). thanks
definitely has a rear cell behind the aperture, yes.
The rear element on the 7"/2.5 will show a little bit of yellow/brown coloring. The rear glass contains radioactive thorium, and will be about 2-3 millirem on contact. Store it away from the kids.
thanks for all your responses! - so you guys actually have this lens? thank you all again for letting me know.
i purchased the lens from ebay and they never said anything about this on the listing..so that pisses me off! it for my graflex i even have a jolo mount in the post. though it was bit odd as i have never seen a lens without a rear element expositing the aperture blades. hmm! dammit.
that scares me it doesnt have the rear element on also.. exposing more radiation!? gahhh - scared (dont have anything to test it either - thats stay far away as possible from me).
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