Hi fellow CS-ers
Need your expert advice on an issue i realized with my lens. I'm using a 24-70 paired with a 7D
The lens focusing is rather irregular and it gives soft images every once in a while.
Did a quick test.
Here are some examples (all shots on tripod with timer release and focusing point always on center) These are around 79% to 85% crops
1. F2.8 - 1st shot ISO100 70mm
2. F2.8 - 2nd shot ISO100 70mm
3. F4 ISO100 70mm
4. F5.6 ISO100 70mm
5. F8 ISO100 70mm
As you can see, the first F2.8 shot and the second F2.8 shot vary in sharpness significantly. The 2nd was shot only after all the shots from F2.8 - F8 were made. They're just put side by side for ease of comparison.
F4 and F5.6, the shot at F4 seemed sharper. Shouldn't the shot at F5.6 be sharper?
F8 seems fine.
It troubles me as the performance is not consistent and every 3-4 shots, i get 1 OOF
Is this normal ? Should i send it in for servicing/calibration?
Thanks guys appreciate it.