[rollei_list] Re: Rolleiflex F ground glass
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 31 Mar 2010 23:54:09 -0300
They seem to be original Elias. These focusing screens were designed
and developed 100% in Rollei by Rollei engineers and technicians
during 1957, Prochnow says that if applied the current language to
1957, they would be considered "High-Tech" products at the time, it
combines ground glass and Fresnel lens advantages, the machines to
manufacture these focusing screens were also designed and developed in
F&H, there is a detailed explanation about the process to manufacture
the screens, but German technical terminology is not clear to me,
anyway I understood they worked on a copper plate taken as "Master".
These screens were standard for Rollei TLR cameras with
interchangeable focusing screen from 1958 and it's interesting to note
that the factory had special kits to replace the older models ground
glass with the new screens.
There were three focusing screens for the cameras with interchangeable
focusing screens, the standard with grid but without focusing aid,
other with grid and split circle (my 3.5F has this one and works fine,
I perceive the difference you perceive regarding the 2.8C ground
glass) and another with grid and bigger central circle with
microprisms.
Carlos
2010/3/31 Elias_Roustom <elroustom@xxxxxxxxx>:
> My 3.5 F has a plastic ground "glass" - I've got another with a split circle
> in the middle.
> Were these original? And how many different patterns did Rollei make for
> this series camera, and how many models were they compatible with?
>
> The two screens I have are well worn, but very usable, and they're brighter
> than my 2.8C's original glass.
>
> Elias
>
>
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