[rollei_list] Re: Rolleiflex F ground glass
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 1 Apr 2010 00:32:13 -0300
I forgot to clarify that the factory kits for the older models with
fixed viewfinder hood were to repair a damaged ground glass, they were
not sold independently, the kit included two washers to compensate the
screen thickness.
My 2.8C ground glass still shows a good image, but it is brighter in
the central area than on the edges, the 3.5F focusing screen shows an
image with uniform bright from the centre to the edges, however
keeping the ease of use to find the best focusing point quickly like
the ground glass.
Carlos
2010/3/31 CarlosMFreaza <cmfreaza@xxxxxxxxx>:
> 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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