Talk:Canon EF 100mm lens
The optical formula did not change between incarnations.
I've heard this several times, but not from a definitive source; this is why I put a cite needed tag in the article. It makes sense that a different type of focus motor shouldn't affect the optics, and that Canon ( or anyone else ) wouldn't invest R&D in developing a new optical formula if it isn't needed. Between this and having been told a few times ( at a pro camera store, online ), it passes my level of "probably true." Still, it needs a citation, and if anybody else feels like this doesn't pass the threshold, Wikipedia says to act bold and remove it.
Hopefully somebody has access to diagrams of the glass in both lenses, or can settle this somehow? ForrestCroce 03:37, 20 December 2006 (UTC)
The optical formulae of the two 100mm f/2.8 macro lenses are completely different. The old (non-USM) one extends while focusing and has 10 elements in 9 groups; the new (USM) one uses internal focusing and has 12 elements in 8 groups. Proof:
more illustrative photo?
hooray for squirrels photographed with macro lenses!
on the right , Should be Yes/No given the new lens
Macro vs. non-macro 100mm lenses - this page either needs to be overhauled, or a non-macro page needs to be added
There appears to be only one page for EF 100mm lenses, and it's this one, which only deals with the macro lenses and pretends the 100/2 USM does not exist. Yet the links to the 100mm lens (both from the 85/1.8 page and from the Canon EF/EF-S lens listings) have separate links to 100mm and 100mm macro - both of which land on this page, whose title doesn't say it's only about macro lenses.
Can someone with access to suitable information, sample photos, etc. of the 100/2 perhaps resolve this? I don't have the resources I need for it.