Quote:
Originally Posted by doubice
Gunnar,
Before you start disassembling your Summicron - a few tidbits of information on the 35mm Summicron and f:2.8/35mm Summaron 'goggled' lenses.
They all focus to 70cm, even with the M3's rangefinder, which was only designed to focus to 1 meter. The goggles change the optical properties of the M3's finder to do this. To compensate for this, the rangefinder cam and internal focusing helicoid of all 'goggled' lenses are cut at a different angle - the lens will thus not couple to the rangefinder properly when the goggles are removed.
You might be able to 'guess focus' the lens but, on the examples that I tried, even the focusing scale sometimes did not match the actual distance once the goggles were removed.
You will of course not encounter this problem on any of the 'non-goggled' convertible (M to LTM) lenses. This is because their rangefinder cam and focusing helicoid are cut to work with all Thread Mount and M camera's rangefinders.
Hope it makes sense....
All the best,
Jan
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Jan, how does that work with the original 35/3.5 Summaron for the M3, some of those had removable goggles so they would also work on the M2. Do they have the 'normal' cam and are thus not able to focus to 70cm on the M3?
Gerry