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Message: <blockquote data-quote="Dave Williams" data-source="post: 1501299" data-attributes="member: 53820">But if budget is part of the equation then not having to buy a new body is a big saving. If he has the money for a body as well I would invest in a D300 before a 40 or 50D which is not only  a superb body it saves other lenses that might also need replacing ?I understand that anyone who has committed themselves to Canon equipment might think that it is the best route but in the last couple of years Nikon can more than match when it comes to top end equipment. OK, as yet Nikon don't have the middle of the range 400 f5.6 but once you start looking at 300mm f2.8's you have moved into a new league of prices and options. From here on you are probably only looking at 4,5 and 600mm f2.8-f4 lenses ( OK you might even consider a 800mm but that is very very specialised) so really there is little to choose between the two manufacturers other than current prices, the equipment you already own that might need replacing and your appraisal of which company will prove the better in the long term and as for the latter, it's any one's guess.PS To stick with the original thread, the 300f2.8 is a brilliant walkabout lens. It's very aircraft friendly too for foreign travel.When you first pick one up it seems pretty huge but very soon it shrinks and replying to the usual comments which are either "how much does it magnify" or "you've got a big one" become tedious !</blockquote>