I just received my d5100 last week and loving it so far. This is my first dslr. I put my older 70-300 on it and was surprised that it metered and autofocused. Some of the shots come out great but others not very sharp. Pretty sure it was the operator and not the equipment. Thinking my next investment will have to be a decent tripod.
Considering the crop factor and length what should my slowest shutter speed be to always get sharp focus when fully zoomed with the 70-300?
Thanks, I just realized in the original post I said it metered and autofocused. It meters but does not autofocus. After reading and playing around some more I think the issue was the automatic ISO adjustment because the light was getting a little low. in the late afternoon.
The Rule of Thumb for a DX body is Minimum Shutter Speed = 1/ 1.5 x focal length Depending on how steady your hands are and how good your handholding technique is you might be able to use a slower shutter speed or require a faster shutter speed.
There are three versions of the 70-300mm listed from best to worst: 1. 70-300mm f/4.5-5.6G ED IF AF-S VR (current) 2. AF 70-300mm f/4-5.6D ED (discontinued) 3. AF 70-300mm f/4.-5.6G (current)
Even though the lens will not AF on your D5100 you can also use the focus indicator in the viewfinder to confirm the focus. Just be sure you are using a single AF point and the active AF point is on your subject.
The first two are optically significantly better than the third. In fact the AF 70-300mm f/4-5.6G is optically the poorest lens in production. This could also be contributing to your issue.