What I learned from Gollywop -- and what I wonder

Started Mar 26, 2013 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: What I learned from Gollywop -- and what I wonder

bowportes wrote:

Anders W wrote:

Based on the few G5 RAWs I have looked at, it doesn't look as though it clips the read-noise distribution at the black level, as does the GH2. If that observation is correct, you could do it by simply shooting a series of black frames (capped lens, dark room, shortest shutter speed, smallest aperture), one at each ISO including the intermediate ones. You then open the files in RawDigger, move the black level backwards to zero, and observe the standard deviations, which in this case should reflect pure read-noise. This is what I did to see how the E-M5 behaved with regard to the intermediate ISOs. See here:


3. Are there any ISOs to be avoided?

See above.

There's been so much emphasis upon the "rules" with the EM5 that I'd like to know what changes with the G5 and the EPL5.

I would guess, but don't know for sure, that the E-PL5 behaves just as the E-M5 in this regard.

Anders, These are the data. What G5-specific "rules" can you give me based upon them?  I'd also be in your general observations about the G5 based upon the data.

Good work! My advice based on the pattern would be pretty much GH2-like: Stick to the 160, 320, 640, 1250 series. The pattern suggests that the ISOs between these are based on digital scaling like on the GH2 (though other types of test shots would be needed to confirm that such is the case) or some secondary amplification that doesn't reduce read noise. Inbetween the four ISOs in the series I gave you, the read noise (as measured in electrons) is pretty much constant. The only difference compared to the GH2 appears to be that they have added at least one more real ISO (1250). Beyond 1250, not much happens that makes it worthwhile to go higher.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
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