I sometimes open my EF 100mm completely to f=2.8 to get an extremely short DoF. This can produce nice effects when shooting flowers/plants, if you want a more artistic, painting-like character. Of course, many macro motifs require an as big as possible DoF (or focus stacking), so in most settings a less fast lens would be all you need.Who knows? But if you think about it, offering a macro lens in even f/2.8 is ridiculous. No rational shooter uses f/2.8 for their depth of field when using it for close-up shooting. Having f/1.8 is just as useless as f/2.8 for real macro shooting. On the other hand, in the same way the 100L macro makes a decent portrait lens when shot at f/2.8, I would think a 35 macro would be a nice general-purpose lens with an option to shoot at f/1.8.
Of course, I'm not just making guesses, I'm guessing at rumors... so I'm happy to be corrected once anyone knows an actual answer.
I personally also think that such a fast wide angle lens isn't anything I'd really need.
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