[rollei_list] Re: Rollei CTH Christmas gift

  • From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Sat, 25 Dec 2010 15:09:59 -0300

Jerry:
         That is a bad and little image from a disappeared Italian web
page about rare Rollei products I tried to improve something adding a
duotone effect, I found it ten years ago and I agree it could give the
idea you described,  however according the Prochnow description in the
Rollei Report IV (page 53-1002) it worked fine with very high
precision, the book shows photographs about the complete system and
the camera with the tripod head in different positions on a dedicated
Rollei tripod legs, one of them shows a TLR almost touching the floor
taking a photograph with auxiliary lenses about a little object on the
floor, the set looks very solid and very firm,  these features were
some of the reasons this circular tripod head was very expensive to
manufacture.

Carlos


2010/12/25 Jerry Lehrer <glehrer@xxxxxxxxxx>:
> Carlos,
>
> Looks a bit shakey to me.  Flexible, that is.  Not rigid enough.  Or how
> else can i
> say it.
>
> To forestall any back comments, my profession is structural analysis.
>
> Jerr
>
>
> On 12/25/2010 3:21 AM, CarlosMFreaza wrote:
>>
>> In 1957 F&H Rollei developed an interesting circular tripod head for
>> the TLR, it was made to have a level instrument high precision and was
>> better from this point of view than others tripod heads using
>> different means like ball heads (f.e.); it had three main functions
>> that could be used combined or separately, one was to offer a system
>> for a perfect parallax correction for close-ups and
>> macro/microphotography similar regarding the Mamiya Paramender someway
>> but more complex (the Paramender is an accesory for the tripod head,
>> the Rollei device was a tripod head directly), the system had
>> different plates according the taking lens-viewing lens combo, this
>> lens plate slid within a frontal fixed lens plate to change from the
>> viewing lens to the taking lens via a lever, in other words the taking
>> lens was placed in the viewing lens place after it was focused (you
>> could do fine focusing again if necessary in the lenses new position
>> BTW, knowing the taking lens had the right framing), the camera also
>> slid on a rail smoothly for a more precise focusing with close-ups and
>> macro auxiliary lenses specially. Using a dedicated tripod legs, the
>> circular tripod head could rotate very much for reproduction work and
>> it could also be used to take up to 10 pano frames having the circular
>> tripod head a special 6º movement to help for the task. Since the TLR
>> could be slid on a graduated rail, you could find the very exact exit
>> pupil for each camera and lens combo.
>>
>> The production prototype was excellent and some samples were made in
>> 1957, but it was very expensive to manufacture, Rollei decided to
>> abort the project, at the end of the day the Heidosmat Rolleinars
>> offered a good parallax correction in general except for some slight
>> perspective distortion perceptible for certain situations and F&H
>> already manufactured the RPH from decades ago; this circular tripod
>> head was a good accesory Rollei did not manufacture for the market.
>>
>>
>> http://dobleobjetivo.blogspot.com/2010/12/rollei-circular-tripod-head-1957.html
>>
>>
>
>
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