 Posted: Sat Jul 13, 2013 10:09 pm Post subject: |
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dan_ wrote:
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| It says the lens comes with a focusing adapter OTZFO. What is this? |
On the Visoflex system lenses were provided without an integrated focusing helicoid, which may be purchased separately. The OTZFO is the focusing helicoid for the 90mm f/2.8 Elmarit (and other lenses). That is the reason why the lens itself is so short.
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| Also what is Visioflex system? |
Visoflex is a system developed by Leica with the goal to transform the Leica M rangefinder cameras into a kind of SLR cameras. In order to do this a mirror & ground glass adapter, focusing adapters and special lenses (with very long register distance to allow the use of the mirror adapter) were used. Just google for "Visoflex" and you'll find more.
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| On another note, I have seen a lot of posts on this forum about diopter. Where it does look kind of weird to me but I am interested in using it. I don't know which one is good though, any suggestion? |
A diopter is a simple lens, just as glasses lenses. It can be positive or negative. The positive ones, mounted in front of your camera lenses, helps those lenses to focus closer (just like glasses with positive diopter lenses are helping one's longsightedness eyes focus closer and read).
The good ones are not simple lenses but achromatic ones and are more expensive. Leica , Nikon, Canon made quality achromats.
Leica achromatic lenses are called "Elpro" and are very good ones. |
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