Yeah, I thought there were significantly more examples of 75mm focal
length than the newer CV lenses. Summicron, Summilux, Elmar, perhaps
some others.
Andrew Fildes wrote:
>While the M3 had the longest Leica baseline it also had the lowest
>magnification at .92 which negated the advantage to some extent, I
>believe. The Contax (and Kiev) had the longest baseline (had to
>modify your grip to avoid covering the RF window) and the new Voigt
>R3a has a lifesize finder (and it's great).
>Yes, Cos/Voigt make a 75mm but so does Leica which I suspect is more
>of an incentive than rf design. Both the Voigt R2a and R3a have 75mm
>and 90mm framelines.
>I suspect that the long baseline issue was more to do with accurately
>focussing fast lenses like the 50mm f1. I owned a CL for a while and
>it was common knowledge that with its short baseline, using anything
>below an f2 Summicron was a bad idea.
>AndrewF
>
>
>On 29/08/2005, at 9:19 AM, Winsor Crosby wrote:
>
>
>>With rangefinders it is all about the baseline. The M3 had the
>>longest baseline of a line of Leicas with long baselines. The focus
>>breakpoint was 135mm on the M3. Any longer and you would not get an
>>accurate focus. There was never any problem at the wide end since the
>>rangefinder did not vary in length and there was lots of depth of
>>field. That is why all those Olympus small RF cameras had baselines
>>about an inch long. Their little fixed 35mm lenses did not need more.
>>Cameras with shorter rangefinder baselines were limited to shorter
>>lenses. It is why some of these newer Japanese Leica copies have a
>>75mm lens option. They have short baselines.
>>
>>With Leica now you can order models with different viewfinder
>>magnifications which changes the baseline and the frames. So the
>>model that takes the 28 mm WA is going to take a shorter maximum
>>length lens. SLR designers are under no such optical restraints and
>>can design lengths they think their customers will find most
>>desirable. At least that is the way I understand it.
>>
>>
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