Thread: HELP! 70-300 af
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Old 28th May 2012
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Ian Ian is offline
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Re: 70-300 af

Right - spotted a problem immediately in the EXIF data - you shot these at the smallest possible aperture (f/22). This means your images are significantly softened by diffraction (try to avoid going beyond f/22) and by reducing the brightness with such a small aperture your shutter speed is only 1/250th. That's good enough for 70mm, but at 300mm I'd be looking for at least 1/500th hand held with IS on and I'd be happier with 1/1000th or even faster if possible. By going back to ISO 100 or 200 you would be able to get more detail and dynamic range, a very acceptable shutter speed at f/8 and the whole image would be more crisp as diffraction softening would have been avoided. I'm pretty sure the shot is in focus, but the problems I have highlighted will have reduced image quality significantly

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