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<blockquote data-quote="Don Kuykendall_RIP" data-source="post: 494000" data-attributes="member: 6277">If you re shooting &quot;Wide open&quot; which I assume is f1.8 then you have very shallow Depth of Field. This is not going to help your focus. Also with that lens you should be shooting at least 1/80 sec at a minimum.&nbsp; The reciprocal rule is that the shutter speed of your camera should be at least the reciprocal of the effective focal length of the lens.&nbsp; Since you are shooting a crop sensor lens you have to multiply the focal length of your lens (50) time the crop factor (1.5) so that equals 75. so you should be shooting at east 1/75 a second or as close to that as possible.Depending on your skill in shooting then you might be able to go slower but with moving cats I really would try to follow this guideline.&nbsp; Ideal shooting would be to set the camera on f8 at 1/80 (or as close as possible) With the D3100 you are smart to keep it a ISO 800 since noise becomes a factor any higher than that. Your best bet it to get a flash that you can bounce off the ceiling so you can get more light.</blockquote>

[QUOTE="Don Kuykendall_RIP, post: 494000, member: 6277"] If you re shooting "Wide open" which I assume is f1.8 then you have very shallow Depth of Field. This is not going to help your focus. Also with that lens you should be shooting at least 1/80 sec at a minimum. The reciprocal rule is that the shutter speed of your camera should be at least the reciprocal of the effective focal length of the lens. Since you are shooting a crop sensor lens you have to multiply the focal length of your lens (50) time the crop factor (1.5) so that equals 75. so you should be shooting at east 1/75 a second or as close to that as possible. Depending on your skill in shooting then you might be able to go slower but with moving cats I really would try to follow this guideline. Ideal shooting would be to set the camera on f8 at 1/80 (or as close as possible) With the D3100 you are smart to keep it a ISO 800 since noise becomes a factor any higher than that. Your best bet it to get a flash that you can bounce off the ceiling so you can get more light. [/QUOTE]

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