lens sharpness

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chris-b

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chris
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can lens's go soft?
my 70-300 is seems to have lost its sharpness. even on a tripod with a remote release the shots seem to be a bit soft. dont know if its down to my every decreaseing skill level . if it is the lens can i get it fixed.

cheers
 
It could also be that you are getting more critical of your shots, I know that when I look at shots that I used to think were sharp they seem soft now.
 
Knocks to the lens won't help.
Take any filters off, turn IS off, and perform the 4 corners test using the tripod
Aim at a wall, square on, at a good distance (not minumum), and take a shot. Then rotate the camera 180 degrees and take another shot. Compare the sharpness of the 4 corners. If the issue is due to a knock, then it probably will not be even all over the FOV
 
thanks coldpenguin.
iv been useing a focus chart to test but will try with the wall.
 
If it is one of the focus charts which you put at 45 degrees to the lens, and at a short distance, don't let Hoppy hear you say that!

With my 70-300, I thought I had an issue with the lens. Real world pics just weren't coming out too sharp. And when I used a focus chart, at a small distance, it did seem to be a problem. However, the minimum focusing length for this lens is 1.5m, so I put up a piece of A4 at 10m, and took a shot of that. Came out quite crisp. Must have been my technique that needed improving, not the lens
 
coldpenguin said:
If it is one of the focus charts which you put at 45 degrees to the lens, and at a short distance, don't let Hoppy hear you say that!
Click to expand...

Quite.

And don't start me on your unusual interpretation of the 'four corners test' either :D
 
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