[LargeFormat] Large Format SLR

[philip lambert]

Richard, does your encyclopaedic memory recall such a big reflex camera that
used a range of lenses interchangeably?  My TP quarterplate reflex had a
6inch Triotar built-in and that was that. For interiors quite hopeless.
Philip
----- Original Message ----- 
From: "Richard Knoppow" <dickburk@ix.netcom.com>
To: <largeformat@f32.net>
Sent: Wednesday, February 11, 2004 9:22 PM
Subject: Re: [LargeFormat] Large Format SLR


>
> ----- Original Message ----- 
> From: "Jim Hemenway" <Jim@hemenway.com>
> To: <largeformat@f32.net>
> Sent: Wednesday, February 11, 2004 1:42 AM
> Subject: Re: [LargeFormat] Large Format SLR
>
>
> > Hi Richard:
> >
> >  > The Graflex shutter is very simple but
> >  > is not self capping and is not uniform in exposure.
> >  > This last can be quite noticable at higher speeds
> >  > and especially when the film in the vertical position.
> >
> > What is meant by "self-capping".
> >
> > So far I haven't noticed any non-uniform exposures but
> thanks for the
> > heads-up.  I've only used it for horizontal shots.
> >
> > Jim - http://www.hemenway.com
> >
> >
>    Its an analogy to capping a lens. In a 35mm camera the
> the shutter is composed of two separate curtains. When the
> shutter is re-wound after exposure the two curtains overlap
> a bit so that no light is passed. The Graflex shutter has
> only a single curtain with several slits of varying widths
> in it. When rewinding the shutter the slit is pulled back
> over the film plane. In a Graflex camera the mirror acts as
> an auxilliary shutter blocking out the light path when the
> focal plane shutter is re-wound, but in a Speed Graphic
> there is no mirror, so a dark slide must be in place when
> re-winding the shutter or the film will be exposed. The
> mirror as an auxilliary shutter allows the Graflex to be
> used for strobe photography in the studio. The Series-D and
> Super-D use a method Graflex called "drop shutter" where the
> shutter is set in O (for open) and the mirror set. When the
> shutter is tripped the mirror comes up, tripping the shutter
> (the shutter is actually tripped by the mirror), the flash
> is fired by the contacts at the beginning of the slit, and
> the shutter then closed. The actual exposure time is around
> 1/7th second so it can't be used for flash fill but can be
> used in the studio where the ambient light is low enough to
> prevent exposure.
>   Some more complex FP shutter designs have been used in
> large SLR and press cameras, an example is the shutter in
> the Zeiss Mirroflex. Busch also made a few press cameras
> with a self-capping FP shutter. I have never seen the Busch
> design but it was not the simple Graflex type. Evidently
> Folmer & Schwing used a more elaborate self capping shutter
> in their first cameras but it proved to be unreliable so
> they designed the simple shutter used forever after.
> Whatever this shutter's shortcomings lack of reliability is
> not one of them. They have proven to be extremely reliable
> and long lived.
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@ix.netcom.com
>
>
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