burkphoto wrote:
Exactly what you might expect... Most of the charts of most of the lenses I've seen have graphs that are shaped very similarly. The highest, flattest part of the graph is usually a sweet spot that's two to four f/stops wide. The DLA is usually about the same on all lenses used with a given sensor. There are notable exceptions, but most lenses perform predictably the same way (although the overall height of the entire graph varies a lot, depending on the quality of the lens!).
I really like being able to test MY lenses (rather than relying on a published graph) - that way you KNOW the performance and if you get a bad copy right up front and the fact that it correlates very nicely with actual results. My 135 f2L plus a Canon 1.4x MKII TC (~190mm) looks noticeably sharper wide open than my 70-200 f2.8L at 200mm f2.8, and the tests show exactly that.