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03-22-2012, 12:03 PM   #16
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OK, a very quick test (daylight's gone here again) - K-7 with Ee-S screen, DA 50-200mm (happened to be on the camera), just about flat (+/- 2 levels) in the centre between f4 and f16 at 63 odd, with EV comp set to zero. Since I would normally use +2/3EV comp with this screen and this lens, that would give about 93, which is in the right ballpark. Auto exposure over the whole frame in Silkypix 5 shifts all of these by some +1.7EV to about 130, from experience I know that Silkypix tends to be a bit on the bright side. Can't be ars*d to do a more precise test at the moment.

03-22-2012, 02:22 PM   #17
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QuoteOriginally posted by kh1234567890 Quote
OK, a very quick test (daylight's gone here again) - K-7 with Ee-S screen, DA 50-200mm (happened to be on the camera), just about flat (+/- 2 levels) in the centre between f4 and f16 at 63 odd, with EV comp set to zero. Since I would normally use +2/3EV comp with this screen and this lens, that would give about 93, which is in the right ballpark. Auto exposure over the whole frame in Silkypix 5 shifts all of these by some +1.7EV to about 130, from experience I know that Silkypix tends to be a bit on the bright side. Can't be ars*d to do a more precise test at the moment.
Is this silky pix or just the correct jpeg factors being applied to a raw image?

Really need to do this in jpeg. Also when you say flat by +/-2you mean grey scale out of a range of 256 ? Also yes a shift of 2/3 stop would be about greyscale 30 in this range, but. You approach 25 it starts getting nonlinear
03-22-2012, 04:45 PM   #18
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Basically all that you see is how bad the viewfinder metering really is.

Metering in liveview on the K-7 I consistently get the right edge of the histogram at 120 at 0EV (75 at -1EV and 175 at +1EV) with either spot or cw. With viewfinder metering it could be anything, depending on the screen, aperture, lens, day of the week etc. You can either calibrate vf against lv for every screen/aperture/lens combination or just take a rough guess, shoot RAW and fix it later.

Things have not really progressed much here, the only SLR that I'd ever had that could meter well was the OM-2 which was metering off the shutter curtain and film reflection. Viewfinder metering is cr*p by design.
03-22-2012, 04:57 PM   #19
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I'll need to look at my K7 and some lenses. It is surprising to me, but I will check. It might actually be the lens

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