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<blockquote data-quote="Horoscope Fish" data-source="post: 205592" data-attributes="member: 13090">Came back to look at this thread and found there is EXIF data attached to your shots. This is very helpful information.According to your EXIF data you're using *really* slow shutter speeds, e.g. 1/20, and as Rick M pointed out, if you're going to be looking at focus charts at 100% crops that's just too slow. You could be inducing focus error by manually pressing the shutter button at that shutter speed, not too mention the possibility of mirror slap doing the same. If you want razor-sharp focus, your shutter speed needs to at LEAST equal the focal length of the lens being use (i.e. shutter speed of 1/50 with a 50mm lens) and I prefer it to be a little higher than that. For focus testing on chart I'd want a shutter speed of no less than 1/125 on a tripod using a remote release at the cameras base ISO........</blockquote>

[QUOTE="Horoscope Fish, post: 205592, member: 13090"] Came back to look at this thread and found there is EXIF data attached to your shots. This is very helpful information. According to your EXIF data you're using *really* slow shutter speeds, e.g. 1/20, and as Rick M pointed out, if you're going to be looking at focus charts at 100% crops that's just too slow. You could be inducing focus error by manually pressing the shutter button at that shutter speed, not too mention the possibility of mirror slap doing the same. If you want razor-sharp focus, your shutter speed needs to at LEAST equal the focal length of the lens being use (i.e. shutter speed of 1/50 with a 50mm lens) and I prefer it to be a little higher than that. For focus testing on chart I'd want a shutter speed of no less than 1/125 on a tripod using a remote release at the cameras base ISO. [COLOR="#FFFFFF"].......[/COLOR] [/QUOTE]

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