At 1:48 PM +1100 2005.01.12, Wayne Harridge wrote:
> ... I found using a 50/1.4 initially that within a certain lighting range
> the timed
>exposure always doubled as I stopped down (expected result), except for f1.4
>to f2
>where the time was less than double (about 1.5 from memory, details are filed
>somewhere @home). This was confirmed using several OM bodies (OM-2N, OM-
>4). I also tested another lens (can't remember which, possibly 100/2.8) with
>the same
>result.
>
Interesting. I noticed a similar effect with a 24/2, taking a couple of
moonlight shots in the
Gawler Ranges National Park (nice place) last month. Elapsed time, going from
f2 to f2.8, was
considerably less than double. This was a 2n on auto, so I thought
auto-exposure had timed out,
but both slides came out fine. Not exactly scientific though -- I was (gulp)
timing by counting
out loud.
regards
Andrew
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