Photons Missing In Action

Started Nov 24, 2009 | Discussions thread
OP Marianne Oelund Veteran Member • Posts: 7,749
I do not need to make that assumption

mmullen wrote:

And please don't assume that a shutter that is 5% slow at 1/250th second will also be 5% slow at 1/125th second or at 1/500th of a second. Due to the nature of focal plane shutters it doesn't work that way.

I am making no assumptions. I have measured the shutter speeds, and their error is far less than the aperture-dependent exposure variations I have found.

You may find the shutter speed measurements here:

If you suspect that shutter speed is a significant factor in the aperture-accuracy measurements, you are in for a surprise.

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