[LargeFormat] Apo Gerogons and Graflex RB Cameras

[Jim Hemenway]

Hi Richard:

Thanks for this post. I didn't know about the resulting one stop 
difference at high speeds.

I usually shoot at 125th of a second on the low tension... maybe that's 
why I didn't notice, or know about this.


Jim - http://www.hemenway.com


Richard Knoppow wrote:

<snip>

>   One thing to be aware of is that the shutter curtain speed
> is not constant. Especially at higher tensions it speeds up
> during its run. When a narrow slit is used (for high speeds)
> the difference between the top and bottom of the gate is
> about a full stop. When using larger slits, or lower
> tension, the difference is less. The Super-D has a
> simplified shutter with only two tensions, high and low, and
> fewer speeds. The speeds are accurate in the center of the
> frame. This was belated recognition than most of the speeds
> on the familiar Graflex/Speed Graphic speed chart are
> wishful thinking. Graflex actually used to advertise the
> speed difference as an advantage because it darkened skys in
> landscapes.
> 
>