I recently acquired a 1D Mark IV for development of FoCal, and have been getting used to it as a camera. I do love macro, and up to now I’ve preferred the 7D over the 5Dmk2 as the greater pixel density gives better magnification and although the image quality is not quite up to the 5Dmk2 this crop factor magnification at 1:1 was very useful.
However, I was never happy using the 7D above about ISO400 when cropping close to 1:1, which was always a bit limiting. The 1D Mark IV on the other hand is stunningly good, producing croppable decent quality images up to ISO3200, even 6400 if careful about the content! I hardly ever use a tripod for macro so this high ISO capability gives me the opportunity to capture things in lower light than I’ve been used to – meaning I can now start to use natural light much more without having to resort to diffused flash to light subjects.
Anyway… here are some examples of shots I’ve taken over the last week or so – all with the 1DmkIV, and quite a few at around ISO1600-3200. See if you can spot the high ISO ones