[LargeFormat] infrared-safe bellows?
Fri May 21 19:58:01 2004
At 15:23 21/05/2004 -0400, Michael Sullivan wrote:
>I was testing a Betterlight large format digital back with my Linhof
>Standard and discovered that the bellows is not infrared "safe".
>Other than wrapping the camera in some infrared-safe fabric every time I
>take a picture, I was wondering if there were some pliable coating that
>could be applied to the bellows itself?
Unfortunately some synthetic bellows materials allow infrared light to pass
through as you have discovered. I'm surprised that the Linhof bellows
behave in this way. You could carry out a quick sanity check using a
camcorder with a low light setting - many of the Sony camcorders have this
option. The setting removes the wide band infrared blocking filter from the
light path. Simply use a Wratten 87C or similar on the front of the
camcorder and set up as for a pinhole test. This will let you know if it is
the bellows that really are at fault.
If the bellows are the culprit then the easiest solution is to have Camera
Bellows UK to make up an infrared light tight set of bellows for your
camera. They probably made the bellows you already have fitted as they are
reputed to supply the factory.
A cheaper option would be to use silver foil (the cooking variety) wrapped
around the bellows - easy to wrap with a bit of clear tape to hold in place
and throw away after use.
There is a link to camera Bellows at http://www.f32,net/links.html