[rollei_list] Re: Lens cap SIZE for 3.5 Xenotar Rolleiflex..."Kegelrad Differential"
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 13 Jul 2006 13:25:28 +0000 (GMT)
The "Kegelrad Differential" or "Bevel wheel";this
little "bulb" with small gears and contacts was an
ingenious solution developed by Rollei engineers and
technicians that allowed to manufacture the 2.8F
camera because Rollei could use the traditional linear
Synchro Compur shutter for the model maintaining the
coupled lightmeter used for the 3.5F first and second
model provided with the new and big Differential
"planetary" Synchro Compur that did not have room in
the 2.8F body.
The Kegelrad does the same work that the planetary
shutter but using a minimal space, you can see it in
one of the Todd's site technical diagrams, the
Kegelrad has the first part number from the right in
the diagram, 17400.04.0:
http://www.rollei-gallery.net/-todd/image-50569.html
All the best
Carlos
--- Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
escribió:
> According Prochnow it was necessary to obtain more
> room for the new Differential ("planetary") Synchro
> Compur shutter size used for the first 3.5F and then
> the distance between objectives was increased from
> 42
> to 45mm like for the 2.8 cameras. Afterwards Rollei
> used again the old linear Synchro Compur because
> there
> was no room for the "planetary" shutter in the 2.8
> cameras due to the lens size and then they developed
> the small "Kegelrad Differential" to couple the
> lightmeter for the F model replacing that big
> shutter
> (this shutter had big gears for the same purpose, to
> couple the lightmeter with the camera f stops and
> shutters speeds). The Kegelrad was used for the 2.8F
> and the 3.5F, however the 45 mm objectives distance
> was maintened for the 3.5F and the 3.5E3.
> Todd has an interesting diagram and explanation
> about
> the planetary shutter:
> http://www.rollei-gallery.net/-todd/image-50568.html
>
> All the best
> Carlos
> --- John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
> escribió:
>
> > This measurement is critical for the Mutars too.
> The
> > information is in Claus Prochnow's Rollei Reports
> > but you require serial numbers. The later cameras
> > had the larger pitch. I cannot remember what the
> > reason was for increasing the dimension.
> >
> > John
> >
> > -----Original Message-----
> > From: rollei_list-bounce@xxxxxxxxxxxxx
> > [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On
> Behalf
> > Of Carlos Manuel Freaza
> > Sent: 12 July 2006 22:31
> > To: rollei_list@xxxxxxxxxxxxx
> > Subject: [rollei_list] Re: Lens cap SIZE for 3.5
> > Xenotar Rolleiflex
> >
> >
> > If you have a Xenotar 3.5/75 it only could be a
> Bay
> > II, however for the lens caps is necessary to know
> > the objectives distance from viewing and taking
> lens
> > from center to center, the distance could be 42 or
> > 45mm and you need the right lens caps according
> this
> > distance, If you write your camera model and
> serial
> > or at least the serial number I could know the
> > distance between
> > objectives.-
> > Carlos
> >
> > --- Jeffery Smith <jls@xxxxxxxxxx> escribió:
> >
> > > Well, I guess my next question is "What size
> lens
> > cap fits on a 3.5
> > > Xenotar?" As Richard pointed out, I need to
> know
> > if it is a Bay I,
> > > Bay 2, Bay 3, or other. Help!
> > >
> > > Jeffery
> > >
> > >
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