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Macro on DX or FX
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<blockquote data-quote="Geoffc" data-source="post: 149599" data-attributes="member: 8705"><p>I'm normally OK at this sort of thing but my brain isn't working today so here goes. My wife has a 90mm macro that she use on her D300. If she fills the frame with whatever she is shooting it will be a 12mp image with associated resolution. If I put this DX lens on my D800 or a D7000 for that matter and take the same picture, the subject is now a 16mp image approx. The latter gives better resolution.</p><p></p><p>I got it into my head that if I buy a 105 Nikkor FX Macro I can then fill my 36mp frame with the same image give or take the difference between 90 and 105mm. I'm now thinking this is not the case as a 1:1 image is x mm wide on the sensor regardless of the sensor size. Therefore if I photograph something small I will have a lot of space around it on FX compared to DX. For example, if I take a picture of something 23mm wide it will fill a DX frame but leave lots of space around an FX frame. If I shoot something 35mm wide I will fill my FX frame but cannot fit it on my DX frame at 1:1.</p><p></p><p>Shall I just have a lie down?</p></blockquote><p></p>
[QUOTE="Geoffc, post: 149599, member: 8705"] I'm normally OK at this sort of thing but my brain isn't working today so here goes. My wife has a 90mm macro that she use on her D300. If she fills the frame with whatever she is shooting it will be a 12mp image with associated resolution. If I put this DX lens on my D800 or a D7000 for that matter and take the same picture, the subject is now a 16mp image approx. The latter gives better resolution. I got it into my head that if I buy a 105 Nikkor FX Macro I can then fill my 36mp frame with the same image give or take the difference between 90 and 105mm. I'm now thinking this is not the case as a 1:1 image is x mm wide on the sensor regardless of the sensor size. Therefore if I photograph something small I will have a lot of space around it on FX compared to DX. For example, if I take a picture of something 23mm wide it will fill a DX frame but leave lots of space around an FX frame. If I shoot something 35mm wide I will fill my FX frame but cannot fit it on my DX frame at 1:1. Shall I just have a lie down? [/QUOTE]
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