This looks interesting, Please keep us posted.
Gene Johnson
[EMAIL PROTECTED] wrote:
>
> Hah! Glad to see there are some other crazies out there. As I see it, it's
> all got to happen in one smooth, fairly simutaneous motion, or you might as
> well use a view camera. That means mirror up, aperture stopped, and exposure
> with flash, all in less than a second or so.
>
> I, too, thought about using a speed graphic for the back end, till I found a
> series D on ebay cheap eonugh. But it's basically the same back there, so it
> will be relevant.
>
> First problem is flash synch, and that should be easy enough. Enlarge the
> curtain aperture to full frame, and add a contact. Thought about using an
> electic eye (infrared) and even a magnetic tape head, but I think the
> contact is still the best. Worked 50 yrs ago.... Sure, the synched speed
> will be slowww, but maybe we can deal with that later. Motorize it?
>
> Next is mirror slam. On RB's, a spring launches the mirror up with a deciced
> thwack. I'ts a 10 minute operation to reverse that spring to hold the mirror
> down, intead, which means the shutter release actuator (what ever that turns
> out to be) must force the mirror up to release the shutter (that part is
> automatic with RB's). This also cures one of the RB's weaknesses�a tendency
> to develop light leaks around the mirror as the release trigger wears or
> loosens.
>
> Auto aperture: Oh boy. Super D's are outrageously expensive in 4x5, and the
> 3x4's are too tight inside to allow use with long lenses. You'd have to add
> an ungainly extension onto the back. And, as far as I know, you're limited
> to the 4.5 152mm and 5.6 190 Ektars. Nice lenses, but still too short. I
> wanna use nice long barrel lenses I can maybe afford.
>
> Nuff for now. But the rest involves springs, thin wire cables, and sleeved
> piano wire ala model airplane control linkage. I'll keep you posted.
>
> Roger Stevens
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