absplastic wrote in post #12697628
Looking at my EF-S 60mm f/2.8, I can see that the rear element does not extend backwards enough to warrant the EF-S mount for reasons of preventing physical glass-to-mirror collision. I should be able to use this on my D60 (or a 10D, 20D
, D30, 30D
, etc.. if I had one of those as a backup body), but it won't fit without some warranty-voiding machining.
Well, it will fit on the 20D and 30D anyway, as those can take the EF-S lenses. There aren't a lot of the older bodies still in use (relatively speaking) as they are now about 8 years old or older and many will have succumbed to faults which weren't worth fixing due to the age of the body. I would also imagine that there were far fewer made than later crop bodies, as earlier digital cameras were much more expensive than modern ones. Many users will have bought a range of lenses before EF-S came along, others will have bought more modern bodies as upgrades and the older bodies are just backups and will have the original lenses bought for it anyway.
Yes, I can see your point, and I am sure that there will be some users who would like to be able to use crop lenses on those old bodies. However, if they were to make them as a third type of lens, EF-C as you suggest, it would cause confusion amongst new users, some of whom already have trouble coping with the differences between EF and EF-S.
The numbers involved probably just don't make it worth while for canon, also if they were to be made with an EF mount but labelled EF-C, they might clear the mirror on the 10D etc., but will they clear it on a 5D? The reason for a physically different mount, is to stop people putting them on FF cameras by mistake and causing damage. Simply sticking an EF-C label on it won't stop everybody (I've seen posts from people who have bought Canon FD lenses and wondered why they won't fit their DSLR).