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The question is wrong.. But the answer to right question ("What is the scale of 600mm lens") would be:
600mm lens has a scale of 1.96arcsec/pixel (if pixel size is 5.7um)
Or. it will have the field of view 53.7x35,8 arc min with 400D (I think this is the same as 40D)
Edit:
This crop factor business is here only because the DSLR's sensors are usually smaller than SLR film size, and people want to compare things....
So any given lens on 35mm camera obviously will have (1.6x in case od 22x14mm sensor) wider field of view, compared with DSLR's with smaller sensors.
Last edited by bojan; 14-06-2008 at 05:06 PM.
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