skoobey said:
Cool, will get the IS 4.
70-300 is not sharp enough at wider end and I don't need 300mm for anything.
My 70-300L was sharper than my 70-200 f/4 IS at 70mm. Photozone gets same result too.
Even my Tamron 70-300 VC was sharper at 70mm than 70-200 f/4 IS (70mm is the weakest point of the 70-200 f/4 IS), even if that was not the case everywhere else along the range.
70-200 f/4 IS had the least lateral CA at 70mm, but was also, oddly enough, the least sharp of the three for me under ultra careful testing (tripod, remote release, 25' to target, constant indoor lighting, best of 8-12 liveview 10x zoom attemps trials for each lens at each aperture).
70-200 f/4 IS was the sharpest of the three in the middle range of the zoom
70-300L was the sharpest at 185mm and up (although the 70-200 f/4 IS wasn't too far behind 185-200mm, the difference was much more noticeable over 200mm, with the 1.4x TC III on the 70-200 f/4 IS to let it get over 200mm).
Both 70-200 f4 IS and 70-300L are very good optically. Tamron is shockingly close at the edge, but actually it is in the center frame where it doesn't always have quite the same bite and sometmes has more halation and such.
I know TDP shows the 70-300L and Tamron doing badly at 70mm and the 70-300L only doing OK at 200mm and up and the Tamrom doing hideously, but those were not my results, nor those of Photozone and many others. It looks like he dropped his Tamron before testing and I really don't know how he got 70-200 f/4 IS+TC to look better than bare 70-300L. Maybe copy variation. Some say they have the 70-300L do relatively better in comparison to the 70-200 f/4 IS in the mid range and not at the extremes, so that may be copy variation, but it seems much more common the other way, with 70-300L doing relatively better at the extremes and worse mid-range, seems to me about 80% get the latter results and only 20%,if even and probably less, the other result.