Originally posted by rawr I'd suggest increasing the shutter speed for those longer focal lengths. 1/100 or so is too slow for critically testing a 200mm, even on a tripod. Plus boost the light level. Or simply use flash for your lens tests.
Thanks for your input RAWR, you're right because I've done more testing and noticed a couple things.
I've been using a flash + continuous lighting and I've increased the distance between lens and target to about 6m.
1- Yep shutter speed is important @200mm even on a tripod, I set to 1/200s and 1/250s
2- Distance between target and lens is also important, previously I was at about 3m and there is a increase in sharpness from 3 to 6m, I tried about 8m and 11m but there was no significant changes comparing to 6m.
I dont have this test picture but it is way better than the images I posted earlier. This lens is truly sharp @/f2,8 from my testing.