[LargeFormat] Shutter speed lengthened by very small apertures

[Jim Hemenway]

Hi Ed:

I've read about it before but I don't think that I've been hurt by it.

I'll let you know if the chromes end up being too light after they've 
been processed.

Jim - http://www.hemenway.com



Edward Meyers wrote:

> With large leaf-shutters when stopped down a lot the actual
> shutter speed becomes longer than set. Shutter speeds on leaf cameras are
> figured at wide open aperture...with small apertures the shutter
> time of opening and closing adds time to the overall setting. Ed
> 
> On Sun, 23 Nov 2003, Jim Hemenway wrote:
> 
> 
>>1/15th at f45 on 11x14 Ektachrome 100 using my 360mm f6.8 Symmar-S today
>>in Boston.... basically Sunny 16 (+ or -).  43F at 10 AM, 51 now.
>>
>>philip lambert wrote:
>>
>>>When I was working for a concrete company in the Middle East I bought a zoom
>>>lens for my camera and the roadtest said best definition was obtained at f8
>>>so I took most of my pictures at f8 on 100  film and the shutter speed
>>>typically was 1/2000.  Today with my Symmar at f16 my Gossen meter suggested
>>>I open the shutter, go and put the kettle on and close the shutter on the
>>>way back..  Definitely a monochrome day.  Colour saturation - what was that?
>>>Philip
>>>
>>>
>>>>a civilized world, closed and boarded up for the Lord's day of rest.
>>>>Unremitting gloom. It was a relief to find myself in Africa and then The
>>>>Middle East.  At least it was sunny on Friday.
>>>>