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Message: <blockquote data-quote="Roy C" data-source="post: 1426758" data-attributes="member: 18798">Mikfoz, I think you miss the point about 100% crops in this thread - it started by someone asking if a 400mm focal length was going to be adequate as opposed to a 150-500 at the long end. The demo was of birds that are very small in the frame being able to be cropped very heavily so as to make a reasonable web image (thus giving pseudo extra focal length).While your crop is very good it is of a bird that was fairly close (big in the frame to start with). The whole point is that it is reckoned that a 400/5.6 resolves more detail thus you can crop heavier and get away with itBTW I think the 50-500 is a better lens optically than the newer 150-500 and the price would seem to bear this out as the bigma has not got OS and yet is just about the same price.On the subject of price there is not that much difference between a 150-500 and a Canon 400/5.6 Prime especially if the Canon was bought from KersoAt the end of the day, if anyone wants the range of a zoom then the 150-500 is the one to get - it sure beats the pants off a 400/5.6 at he 150-399 range <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>