garyvot
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Rainbow Chaser wrote:
As a used option just because I've heard people rave about it, I also considered Canon EF 50mm f/1.2L USM with an adapter.
Regrettably, the EF 50mm f/1.2L has significant focus shift that is uncorrectable on Canon R bodies. It will render your images out of focus at closer focusing distances between apertures of 1.6-2.8. Beyond that, it feels like it would be out of place on something as petite as an R100.
The RF 45mm f/1.2 suffers from the same issue, but it can be corrected by setting the Exposure Sim setting in the camera to 'Exposure+DOF' (on camera bodies which support this). This allows the camera to acquire focus while stopped down to the shooting aperture. This feature is not present on all Canon bodies, so you would want to investigate that before investing in this lens.
Rainbow Chaser wrote:
I am considering the following STM lenses as a complete bag.
- Canon RF-S 18-150mm f/3.5-6.3 IS
- Canon RF 28mm f/2.8
- Canon RF 50mm f/1.8
I personally dislike slow zooms on crop bodies in the "standard" range, but that's just me (maybe). Thus, I have little interest these types of RF-S lenses.
But I do think Canon's line of full frame STM primes work very well on APS-C cameras, being usefully fast, sharp, often stabilized, and light weight.
IMO, an excellent three-prime lens kit for Canon crop is the RF 16mm f/2.8 STM, RF 24mm f/1.8 IS STM Macro, and RF 50mm f/1.8 STM (25mm, 38mm, and 80mm equivalents). These are all full-frame lenses as a bonus, so if you have a full frame body, they can do double duty. These lenses all have some flaws like LoCA that are magnified on crop, but can be dealt with in post for the most part. I took this kit (along with the 85mm f/2.0 IS STM Macro) with me to Bali when I had my EOS R10.
I'd stick to the 50 STM over the 45, because it is a better match in terms of size/weight, and because you will likely need to stop the 45mm down to f/1.8 anyway for good sharpness on APS-C. (Also, focus shift.)
The RF 28mm is a 45mm equivalent on crop, a focal length which some people may like, but--while optically excellent--it is slowish at f/2.8, which in terms of DOF rendering is equivalent to f/4.5 on a full frame body. I might look at the RF 35mm f/1.8 IS STM Macro for a "normal lens" instead. (Caveat: I'm a people photographer, so this is important to me, but if you mostly shoot landscape, nature and travel photos stopped down, this won't matter.)
If you would consider third party, there also are the Sigma and Tamron RF-S offerings. And Yongnuo also now offers a line of fast RF-S f/1.4 primes that look promising.
Though bulkier than RF-S equivalents, EF-S lenses can also be adapted and work well. Some gems are the 10-22mm or 10-18, 60 Macro, 24mm pancake, 15-85mm, 17-55mm, and 55-250mm f/4-5.6 IS STM (the last, best version of this zoom). (The 24mm pancake is recommended because of its focal length and quality, but I still wish it were an f/2 lens.) The EF-S zooms are generally faster than the equivalent RF-S choices. I used all of these lenses on various Canon crop DSLRs (including the R100's spiritual ancestor the SL1) with good results.
Hope this helps.
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