Originally posted by SpartanWarrior when the Kr came out it was a FF beater by all in Pentax forums and it only scored low light ISO 755, how much better can the K-5 be? maybe a little but it isn't going to get to the 5D II level of 1815 sorry.
Not all, not me. I always pointed out that low light performance of FF is out of reach. After all, it's because at the same f-stop and same FoV, FF
lenses have twice the surface. How should this change?
However, as far as DR is concerned, the gap may be closing though (until the next batch of FF sensors emerges).
Originally posted by SpartanWarrior Ya I know that but not in half, I am so sure ISO 6400 in the 5D II is actually half of that, which is the most stupidest thing I have ever heard.
There is an ISO standard for ISO sensitivy (what a surprise
), it is ISO Standard 12232.
However -- and Kodak stated that quite clearly in some paper regarding their film speeds -- it is not mandatory when labelling a recording media's sensitivity. It's more a synchronization means between camera and exposure meter.
Kodak recommends a testing procedure which would give the professional media (film intended for professional or studio use or larger format) a higher iso label, for added headroom in the highlights.
Looking at the sensitivity curve for Canon's FF and APSC cameras, Canon seems to do the same. Just add extra headroom in the highlights for FF (shift iso) because there is extra headroom in the shadows too. The only thing they miss to do is revert the correction at higher iso (where the shadow headroom (footroom?) disappears). BTW, Canon duplicates their low iso sensitivity (73) as both ISO 100 and ISO 50