[pure-silver] Re: old rollei over exposing
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 18 Feb 2005 16:56:30 -0800
The shutter on the EVS and later is MUCH nicer. too bad the cameras are such
a pain to work on. The MX is just so simple (for a Rolleiflex)
----- Original Message -----
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, February 18, 2005 12:29 PM
Subject: [pure-silver] Re: old rollei over exposing
>
> ----- Original Message -----
> From: "Jim Brick" <jim@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, February 18, 2005 9:23 AM
> Subject: [pure-silver] Re: old rollei over exposing
>
>
> > At 10:59 PM 2/17/2005,>
> >>Okay, WHAT manufucturers generally recommend? Point us to
> >>a source or three. Show us they recommend leaving it
> >>cocked, or show us they
> >>recommend NOT leaving it cocked.
> >
> >
> > OK... take Hasselblad for instance. It is not that they
> > tell you one way or
> > the other, they simply do not provide you with a way of
> > uncocking a lens
> > shutter. The ONLY way to mount or unmount a lens from a
> > Hasselblad is, if
> > the shutter is cocked. Hasselblad provides no way of
> > uncocking a shutter
> > when it is off of the camera. Yes, you can do it, but
> > Hasselblad tells you
> > that if you should accidentally uncock a lens shutter
> > while the lens is off
> > of the camera, you should cock it again using a coin and
> > provided coin
> > slot. Even focal plane shuttered Hasselblads (I have two)
> > operate this way
> > as they can use shuttered and non-shuttered lenses. The
> > focal plane
> > shutters as well as the lens shutters, stay cocked.
> >
> > ALL stored Hasselblad shutters, whether in original boxes
> > awaiting sales or
> > in a photographers bag, or in great grandfathers closet
> > awaiting the
> > eventual grandson finding it... are cocked.
> >
> > You simply do not have uncocked Hasselblad shutters laying
> > around. After
> > exposing a frame, you ALWAYS wind the camera which cocks
> > the shutter and
> > advances the film. Not doing this can be a problem. a.)
> > you cannot remove
> > the lens in order to use another, and b.) If you change
> > backs, you risk a
> > double exposure on the removed back and a skipped exposure
> > on the new back.
> >
> > The first Compur shuttered Hasselblad 500c appeared in
> > 1957. Hasselblad
> > lens shutters, from that day on, have remained in the
> > cocked state as the
> > norm. Yes, some ne'er-do-wells have, undoubtedly, using a
> > toothpick,
> > tripped all of their Hasselblad lens shutters thinking
> > they were doing
> > their shutters a favor. Based upon the way the system was
> > designed, I
> > believe they were not.
> >
> > IMHO,
> >
> > :-)
> >
> > Jim
> >
> BTW, the type of spring used in the old "dial set" Compur
> is similar to that used in the latest (as used on Hassy and
> Rollei) version. That is both use a flat spiral spring like
> a clock motor. These are always partially tensioned. Later
> Compurs, of the "rim set" variety, up to the EVS shutters,
> used coil springs. Actually, these are also partially
> tensioned all the time. The idea probably is to minimise the
> difference in available drive force as the shutter is
> operated.
> Middle age Compurs of the Compur Rapid type have an
> additional booster spring for the highest speed. This is
> compressed by the speed dial and accounts for the long
> travel between the next to highest speed and the highest
> speed and for the force needed to get there. Its probably a
> good idea not to leave this spring tensioned all the time
> although it may not make any difference. The reason these
> shutters should not be put into the highest speed position
> (usually 1/400th or 1/500th) is that the force needed to
> compress this spring while the shutter is cocked may force
> it under the speed ring jamming the shutter. It could also
> wear the ring and spring if done often.
> Its probably OK to go from the highest speed to a lower
> one.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
============================================================================
=================================
> To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you
subscribed,) and unsubscribe from there.
>
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
