1/3 stop ISOs

[John Sheehy]

So for a 5D it sounds as if one should stick with 100, 200, 400, and if necessary 800 and 1600.
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I've thought about this a little more, and even though I said 1000 shouldn't be too bad, it might make more sense to shoot at 800 (and the 100/200/... group in general), and under-expose to get the same Av and Tv values you might get with the 1/3 stop push.  The only advantage to an extra stage of amplification, I would think, is that highlight headroom is consistent (as compared to the 30D's mathematical pushes); the benefits of using the full RAW number range for the standard headroom are probably mostly imaginary with the amount of noise present.

[Eric Myrvaagnes]

I've thought about this a little more, and even though I said 1000 shouldn't be too bad, it might make more sense to shoot at 800 (and the 100/200/... group in general), and under-expose to get the same Av and Tv values you might get with the 1/3 stop push.  The only advantage to an extra stage of amplification, I would think, is that highlight headroom is consistent (as compared to the 30D's mathematical pushes); the benefits of using the full RAW number range for the standard headroom are probably mostly imaginary with the amount of noise present.
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Thanks, John. That agrees with what I was guessing.

-Eric