Re: [Rollei] 1/500" with pre-F Rollei TLR?

[Richard Knoppow <dickburk >]

At 02:50 PM 06/26/2002 -0500, you wrote:
>Hi Ruggers!
>
>I have a Rollei 2.8E (type 1) from 1956 and the manual states that if you
>want to use the 1/500 shutter speed, you must select it before tensioning
>the shutter (eg. advancing the film). What I haven't been able to find out
>is what happens if you do not heed this advice. Do you damage the shutter or
>will it simply not access the 1/500 speed, therefore -I should think-
>shooting at 1/250?
>
>Thanks for any insight you might provide.
>
>--Jorge.
>
>
  Are you sure this is an E?. I thought they all had late type
Synchro-Compur shutters, maybe not. 
  In any case, older type Compur shutters have an auxilliary booster spring
for the highest speed. This spring is compressed by the speed ajusting cam.
If the shutter is cocked first the amount of force which must be applied to
the spring is excessive. It may even push the end of the spring under the
cam very effectivly jamming the shutter. No great damage is done but the
shutter must be disassembled part way to un-jam it. 
 If you have a shutter with the booster sping you can feel it when setting
to the highest speed. There is also longer travel of the speed setting ring
(or dial on Rolleis) in going from the next to highest speed to the highest. 
  Later shutters use a single spiral clock motor type spring, which is
always under a fair amount of tension (pre-loading). This is the motor
arrangement used for Hasselblad shutters, which must be left cocked. Speed
changes can be made at will on these shutters, regardless of whether they
are cocked or not. It also does not matter where they are left cocked for
long periods of time, they are designed for just that. 
  There is no exta tension when going to the highest speed nor any extra
travel.  
- ----
Richard Knoppow
Los Angeles, CA, USA
dickburk  

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