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24-120 F4 focus breathing
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<blockquote data-quote="Geoffc" data-source="post: 216391" data-attributes="member: 8705"><p>Just for clarity, I'm not talking about the effect where the focal length changes based on camera to subject distance, I'm talking about the focus accuracy of a zoom changing based on focal length.</p><p></p><p>Let's say I fine tune the focus at 24mm. Now at 120mm the lens will slightly front or back focus. It also happens the other way round. Or I tune the focus at 1.5m and it is off at 5m.</p><p></p><p>This is most noticeable at wider apertures due to shallow depth of field. On my DX D300s it's fine, mainly because it has greater depth go field. The other day in my studio I ended up using the D300 as I was getting better focus accuracy on my grand kids. It's still I fantastic camera when you feed it with light.</p><p></p><p>Using live view I can alway get good focus so the lens is capable at all distances and focal lengths.</p><p></p><p>I am quite fussy about sharpness so some people may not notice.</p></blockquote><p></p>
[QUOTE="Geoffc, post: 216391, member: 8705"] Just for clarity, I'm not talking about the effect where the focal length changes based on camera to subject distance, I'm talking about the focus accuracy of a zoom changing based on focal length. Let's say I fine tune the focus at 24mm. Now at 120mm the lens will slightly front or back focus. It also happens the other way round. Or I tune the focus at 1.5m and it is off at 5m. This is most noticeable at wider apertures due to shallow depth of field. On my DX D300s it's fine, mainly because it has greater depth go field. The other day in my studio I ended up using the D300 as I was getting better focus accuracy on my grand kids. It's still I fantastic camera when you feed it with light. Using live view I can alway get good focus so the lens is capable at all distances and focal lengths. I am quite fussy about sharpness so some people may not notice. [/QUOTE]
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24-120 F4 focus breathing
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