This thread will probably only interest a very tiny percentage of AP members...
If you've got a Canon MP-E 65mm lens, and one of those funny lens hoods Canon makes for it, then you've probably faced the same dilemma that I did... you either have to:
- take the lens hood off each time you use it (time consuming and very tedious, as it mounts via a very fine screw thread), OR
- leave the lens hood on permanently but then you've not got any lens cap to protect the lens from dust (though the lens hood does a good job of protect the glass from knocks)...
After some deft measuring of the lens hood's inside diameter (34mm), I recently ordered a $5 generic lens hood on eBay, which fits perfectly and has solved this tiny but most annoying idiosyncrasy...
Link to where the lens cap can be found on eBay...
http://cgi.ebay.com.au/Normal-Front-...item3cafc1698f
See pictures below... (sorry, a bit more depth of field would have helped in the first picture)