Luminous Landscape Forum
Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: kozure_ookami on June 07, 2007, 11:46:05 am
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Hi,
I've recently purchased a 24-105L that I wanted to replace my 17-85EFs.
The EFs served me well, but I was never quite happy with it when zooming in at large apertures.
I took some tests shots, but the results are a bit puzzling to me:
- at 24mm the L is better than the EFs (the text on the BIC pen is clearer)
- at 70mm the EFs is better (the text on the L box is barely readable in the L shot)
Here are the tests (my server was pretty unstable this morning, so if the links do not work please copy/paste them in your browser). All shots were taken from tripod, time release, at f5.6. The camera is a Rebel XT. Center focus on the 'Canon' corner of the L box.
At 24mm:
<a href="http://brunovais.xhost.ro/Tests/24-105L_MG_2274-01.jpg">L at 24mm</a>
<a href="http://brunovais.xhost.ro/Tests/17-85_MG_2278-01.jpg">EFs at 24mm</a>
At 70mm:
<a href="http://brunovais.xhost.ro/Tests/24-105Lzoom_MG_2277-01.jpg">L at 70mm</a>
<a href="http://brunovais.xhost.ro/Tests/17-85zoom_MG_2281-01.jpg">EFs at 70mm</a>
Is this normal? I thought the L would win hands down. The colors are indeed better, but the focus is not what I expected.
thanks for your help
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In looking at your samples - it seems to my eye that the focus is different in each shot for the 70mm samples. That's why the text on the L box is blurry. It's beyond the focal plane.
I'd try the same shots with a ruler instead of the lens boxes to be sure exactly where the focus point is...
jdv
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In looking at your samples - it seems to my eye that the focus is different in each shot for the 70mm samples. That's why the text on the L box is blurry. It's beyond the focal plane.
I'd try the same shots with a ruler instead of the lens boxes to be sure exactly where the focus point is...
jdv
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That's absolutely right. The nearest corner of the EF 17-85mm box is sharper in the 24-105 shot at 70mm. The focussing is not the same for both shots.
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Hi,
I've recently purchased a 24-105L that I wanted to replace my 17-85EFs.
The EFs served me well, but I was never quite happy with it when zooming in at large apertures.
I took some tests shots, but the results are a bit puzzling to me:
- at 24mm the L is better than the EFs (the text on the BIC pen is clearer)
- at 70mm the EFs is better (the text on the L box is barely readable in the L shot)
Here are the tests (my server was pretty unstable this morning, so if the links do not work please copy/paste them in your browser). All shots were taken from tripod, time release, at f5.6. The camera is a Rebel XT. Center focus on the 'Canon' corner of the L box.
At 24mm:
<a href="http://brunovais.xhost.ro/Tests/24-105L_MG_2274-01.jpg">L at 24mm</a>
<a href="http://brunovais.xhost.ro/Tests/17-85_MG_2278-01.jpg">EFs at 24mm</a>
At 70mm:
<a href="http://brunovais.xhost.ro/Tests/24-105Lzoom_MG_2277-01.jpg">L at 70mm</a>
<a href="http://brunovais.xhost.ro/Tests/17-85zoom_MG_2281-01.jpg">EFs at 70mm</a>
Is this normal? I thought the L would win hands down. The colors are indeed better, but the focus is not what I expected.
thanks for your help
[a href=\"index.php?act=findpost&pid=121627\"][{POST_SNAPBACK}][/a]
You say you're shooting on a tripod - in that case, did you switch OFF the image stabilisation on the 24-105 lens? I'm not sure which version of IS that lens has, but with some versions of IS you are advised by Canon to switch IS off when using a tripod, other wise you'll get _worse_ results.
HTH
Alan