| DavidD |
| Newbie |
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| South Oxfordshire |
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| None Specified |
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| Friday, November 06, 2009 |
| Thursday, November 19, 2009 1:50:17 PM |
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Thanks Mark - I'm not used to IS and you've confirmed what I found today. I experimented with exposures that you can hand hold (eg 1/30th sec or faster) and longer exposures (eg 1/2th or slower) - with all exposures on a tripod with mirror lock up, time delay and electronic shutter release. At hand hold exposures there is no noticeable difference with the IS on or off. With longer exposures the IS ones are blurred and non-IS ones are not. I checked the auto focus using the tools identified on the forum and the lens is spot on. So my softness problems seem to have been a result of slower exposures with IS on and not the lens in itself.
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I too have found the 24-105 on the 5Dmk2 somewhat disappointing - sharp enough centrally (best at f8) but blurring at the edges quite a bit and this sees worse in the far left bottom corner than on the right - I'm going to try the focusing checks suggested. I agree about the sharpness of the OM lenses too.
I've also noticed that on long exposures (with mirror lock up and time delay switched on) I seem to get better results by turning off the image stabilisation. Is this a general stabilisation issue do you think or is it just my set up? Tripod is sturdy enough and there was no wind.
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