As you know, Canon will soon be announcing the Canon RF 50mm f/1.8 STM lens. This is a small, light and affordable 50mm option for the EOS R system.
You can expect an official announcement from Canon soon.
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That being the case, there is nothing to prevent Canon from following this up with an RF 50mm f/1.8 IS STM Macro for those who would like the matching set of affordable 35/50/85 IS Macro primes.
Well, size. Putting an RF-EF adapter on to a lens that is intended to be small negates some of the smallness benefits that small seekers were hoping to achieve in purchasing a small lens.
Control ring.
A feeling of smugness that you have an RF lens versus the peasants that refuse to let go of their EF arsenal.
That's about it.
I think a kit lens would most likely be some sort of zoom. They're generally intended to be versatile whereas any prime is inherently a bit specialized.
Nevertheless I'm sure plenty of people will want this lens, and that's what matters. For what it's worth, I'm pretty happy for now with my EF f/1.4, and use primes infrequently enough that I can't justify buying another of the same focal length. I won't be in this market, but I know plenty of other people will be. And expanding the range of choices is a good thing whether or not I'm interested in the new option!
If I use my 40 f2,8 Pancake with the EF R Adapter its probably the same size!
If image quality is halfwaht decent, that would be a great little lense for travel, street and general walk around =) =)
I tried the EF50 f/1.8 STM on my R5 last week and it's by far the worst result among all my EF lenses. It gives a focus confirmation, but it is out of focus 90% of the time with moving subjects. On my 7D and M6II it focusses fine, on the RP I sold it was 'OK', but it the R5 hates it. If I didn't have other cameras to try it on I would've said "broken lens" and chucked it in the recycling bin.
So I'm looking forward to be able to buy some of that smugness and retire this peasant EF lens :) I predict that Canon will fix this issue in firmware right after the RF50 STM gets delivered.
I predict something around $200 less than the RF35 since it lacks IS, so it will end up costing $300. For $150 I'd pre-order it the moment it goes live.
Just from an aesthetic point of view, I don't like the way the lens barrel protrudes from the front of the lens as with the RF35. Just me I guess ...