[rollei_list] Re: Prochnow's Rollei Report II 2008 third rev ed.
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 26 Oct 2010 16:37:33 -0300
2010/10/26 Emmanuel Bigler <Emmanuel.Bigler@xxxxxxxx>:
>
> 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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