Twenty years ago, I figured out this extreme test to measure how fast the
28/2.8 really was. I was not fully aware of the possible light falloff of
the T-32.
The story began when I observed that when I opened the 28/2.8 one stop from
22 to 4, speed moved up one stop faster (or in manual clicking the speed
ring towards faster speeds to keep the needle of my OM-2 centered) -
*except* when opening up from f4 to f2.8.
In that full stop opening, meter showed only a half stop rise. Yes, no
matter how much troubleshooting I did.
Now I have another OM-2n, and the 28/2.8 behaves the same. It behaves like
this since I bought it new. Does anyone have the same experience? What about
the 24/2.8?
This can't be explained by light falloff at full aperture... and I didn't
notice anything wrong in it.
Perhaps I should examine it again, don't know. Suggestions?
Thanks Chuck for your wise test and conclusions.
Fernando.
> From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
> Subject: [OM] The (well almost) definitive word on T-32 coverage
>
> Fernando's
> results may also be a bit more extreme since, being outside, there were
> no walls or ceiling to recycle any of the stray light back into the image.
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