OK, so I did a test on the 300D with a 50/1.4
<http://www.moosemystic.net/Gallery/300Dexp.jpg>.
Should be pretty self-explanatory.
Top row were taken in Auto Mode, starting with f1.4. I just took a shot,
moved the aperture one notch and took another, etc. Bottom row the same
except I adjusted the little arrow to set "match needle" exposure by
changing the shutter speed. All the speeds are those in the EXIF data
from the camera.
Subject is a poster of a Van Gogh painting, in case you were wondering
what would look so odd in the small size.
Looking at the histograms, best exposure is about f2.8@1/80 and
f2@1/160, iso 800, equivalent exposures found in #3, top row and #2,
bottom row. Looks like 300D weirdness is in the opposite direction from
E-1 weirdness, getting darker with smaller apertures. Obviously it is
not linear, settling at about f2.8-f4 with this lens and light level,
then staying pretty much the same. Getting an idea of what is going on
requires a whole set of exposures, particularly at large apertures. The
first 2 Auto shots are definitely overexposed with some blown out
highlights.
While Auto uses evaluative exposure on the 300D, Manual Mode uses center
weighted, with much more stable results. I could just add 1/3 stop plus
exposure compensation and be good an any aperture.
Light level was moderate, I'll try another lens and/or light level.
Moose
C.H.Ling wrote:
>Just test the E-1 again at center weight average and A mode, with brighter
>scene (ISO200, F4, 1/250s), both 35/2 and 75-150 (at 75mm) got brighter
>image at F16 vs F4. When the target light was lower (ISO 200, F4, 1/13s),
>the images was slightly dimmer at F16 for 75-150 and the 35/2 still gives
>slightly brighter image at F16. It looks more complicated as I have
>expected, I didn't know it is light intensity related although I knew
>different lenses act differently.
>
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