[rollei_list] Re: Prochnow's Rollei Report II 2008 third rev ed.
- From: Emmanuel Bigler <Emmanuel.Bigler@xxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 26 Oct 2010 16:06:05 +0200
CarlosMFreaza a écrit :
Emmanuel:............;
The info about the new cameras is basic as you wrote, however he
quotes the 2.8GX chapter in the Report 4 for details about these
cameras. It looks like the FT "new focusing mechanism" became an urban
myth; during lasts days of Rollei Fototechnik was developed an FT
prototype with a complete new focusing mechanism, the model was ready
to production but RF suspended it because the new machinery cost was
very expensive.
Carlos
I am happy that you received the 3-rd edition of Claus Prochnow's
report volume 2.
Regarding the tele rollei :
The new 4,0FT must have a different focusing mechanism since the
closest focusing distance is now 1.3 metre.
The old R-TLR tele had a closest focusing distance of 2.6 metre,
almost exactly what you would extrapolate by keeping the same amount
of travel of the front panel for a 80 mm focusing at 0.9 metre (the
minimum distance increasses like the square of the focal length,
.9*(135/80)^2 is about 2.6 metre)
The amount of travel required to focus from infinity down to 1.3 metre
for a 135mm lens is 14 mm, this is almost twice the actual value of
the standard R-TLR.
So either it is a different cam with 14 mm of travel, or another
different focusing system, but it cannot be exactly the same cam as
used on a standard (and tele) R-TLR.
--
Emmanuel
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