10-08-2012, 06:06 PM
I've been testing this lens to see if it's as sharp as tests report it to be. But I'm not getting this sharpness.
I've checked focus with live view, and I think I have it at its sharpest position, but it's hard to be sure, due to the enormous depth of field (hyperfocal distance is 3.32 meters, focus is from 1.66 meters <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />).
The test here at Photozone says it's sharp from 2.8 on the Canon EOS 50D, I have the Pentax K-5 and it's only 1 megapixle more or so, so it shouldn't be much softer at 100%.
Is there something wrong with it, or am I doing something very wrong? I've tried other focus distances, but it's not getting better.
Here are some images, the start from f/2.8, then f/4 and so on:
- https://www.dropbox.com/sh/xlhylu0iqgpfqnv/5943ecQMDd
They look OK from F/4 and up I think, but isn't f/2.8 supposed to be sharper? I have tested several times, there's no better than this at f/2.8.
I've checked focus with live view, and I think I have it at its sharpest position, but it's hard to be sure, due to the enormous depth of field (hyperfocal distance is 3.32 meters, focus is from 1.66 meters <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />).The test here at Photozone says it's sharp from 2.8 on the Canon EOS 50D, I have the Pentax K-5 and it's only 1 megapixle more or so, so it shouldn't be much softer at 100%.
Is there something wrong with it, or am I doing something very wrong? I've tried other focus distances, but it's not getting better.
Here are some images, the start from f/2.8, then f/4 and so on:
- https://www.dropbox.com/sh/xlhylu0iqgpfqnv/5943ecQMDd
They look OK from F/4 and up I think, but isn't f/2.8 supposed to be sharper? I have tested several times, there's no better than this at f/2.8.