[Steve]

I know the question about which replacement lens hood to use on the very popular Canon 17-40L lens when fitted to a 1.6x crop factor body has been raised in the past but I have today stumbled across a piece written by David Burren, a Australian photographer that has researched this and a few other combinations. Below is an except from his findings but please have a look at the full article as it includes a table of lenses, lens hoods and what works with what…all very useful.

snip...you can replace the EW-83E hood with a hood designed for the EF 24mm f/1.4L USM lens. There are two versions of this hood: the EW-83D and the newer EW-83DII.

The hood is quite a bit longer than the EW-83E. On the D30/D60/10D/20D/350D no vignetting can be seen, the cut-outs in the side allow room for you to manipulate a polariser with your fingertip (incidentally I do the same thing with the EW-78BII hood on the 28-135mm IS lens), and when the hood is reversed it fits neatly into a lens pouch.

The inside of the EW-83D hood is not "flocked" as the EW-83E is (flocking is a felt-like surface that reduces reflections). I haven't yet noticed any problem caused by this though. Apparently the EW-83DII hood does have a better internal coating.

I have emailed him to ask for permission to copy the whole article here, including the pictures but until I receive a reply here is the link to it on his site.

http://burren.cx/photo/ew83d.html