If this CR1 rumour ends up being true, one has to applaud Canon for their innovation. A Canon RF 100mm f/2 IS USM would fill a huge range of purposes for certain photographers (myself included). As several posters have already pointed out, it could make a great portrait lens.
I owned the Canon EF 100mm USM (non L / non-IS) for some years … I was particularly glad with the macro images I got from this lens. However sometime after its release, I upgraded to the newer Canon EF 100mm macro. The main reasons were:
- Improved AF – for non macro work in particular (the non L AF is often not accurate at longer working distances, so it made it much less useful as a portrait / candid event lens)
- IS helps for certain handheld photos (at around 2:1 in particular.. the closer one gets to 1:1 – the more stability of subject and absolutely no camera movement is important)