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Tamron Vs. Sigma Vs. Camera
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<blockquote data-quote="J-see" data-source="post: 469793" data-attributes="member: 31330"><p>It's about pixel density indeed. If I put a 300mm on my DX or on my FX, the subject travels at the same speed across my sensor but if my DX has 1.5 times the pixel density, I have to shoot it 1.5 times as fast to pixel freeze the shot.</p><p></p><p>If a bird travels 1mm surface area on my sensor during 1 second, I need a shutter of 1 second divided by the pixels my sensor has in that millimeter of surface. </p><p></p><p>For a DX that's (roughly) 6000pix/24mm = 1/250s.</p><p>For a similar MPix FX that's 6000pix/36mm = 1/166s.</p><p></p><p>The only difference between both is that the subject can travel further on the FX sensor.</p><p></p><p>For shake it is the same, each fraction I move during exposure is magnified in relation to pixel density.</p><p></p><p>A D3000 as an example can be shot slower since it has less pixels. 3872/23.6 = 1/164s; almost identical as the 24Mpix FX.</p><p></p><p>It shows that even when there is a general rule of second/(focal length * crop) it really depends on cam vs cam.</p></blockquote><p></p>
[QUOTE="J-see, post: 469793, member: 31330"] It's about pixel density indeed. If I put a 300mm on my DX or on my FX, the subject travels at the same speed across my sensor but if my DX has 1.5 times the pixel density, I have to shoot it 1.5 times as fast to pixel freeze the shot. If a bird travels 1mm surface area on my sensor during 1 second, I need a shutter of 1 second divided by the pixels my sensor has in that millimeter of surface. For a DX that's (roughly) 6000pix/24mm = 1/250s. For a similar MPix FX that's 6000pix/36mm = 1/166s. The only difference between both is that the subject can travel further on the FX sensor. For shake it is the same, each fraction I move during exposure is magnified in relation to pixel density. A D3000 as an example can be shot slower since it has less pixels. 3872/23.6 = 1/164s; almost identical as the 24Mpix FX. It shows that even when there is a general rule of second/(focal length * crop) it really depends on cam vs cam. [/QUOTE]
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Tamron Vs. Sigma Vs. Camera
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