Re: Finding camera leaks

[P3D Greg Erker <erker@xxxxxxxxxxxxxx>]

George wrote:

>The advantage of being able to _see_ the leak is that you know if your
>attempts to fix it worked or not.  No need to try film again.

  I think the film test may be more sensitive than a bulb inside
the body.  John B told be about trying the bulb test on his
Sputnik and failing to find the light leak(s).

  My response was that unless you had a very bright bulb it
won't reproduce the "camera leaking while out in the sun for
an hour" test. What fraction of the sun's light has to leak
into your camera to partially fog 100 speed film (not fogged
totally clear) in an hour. Is it 0.1% 0.01% or even less?

  And could your eyes see that small fraction of light leaking
out of your camera, coming from a small bulb (even a 2W
halogen)?

  I don't know for sure, but I think the film test (with 400
speed or higher) is a more sensitive test. The bulb in the
camera test is fine for bad leaks.

My opinion only - Greg E.



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