So we haven't heard from the OP again yet. Lenses. For Volleyball and other sports the 70-200mm f/2.8 is tough to beat IMO. Pricey, but an amazing lens. 50mm on an APS-C could work at ebiggs points out, but on a full-frame the 70-200mm would be my choice. On APS-C maybe the Sigma 16-300 could be another good budget-friendly choice. I've gotten some good soccer shots with that.
For night sky pics it's harder to get wide on the APS-C, and full-frame does much better there. The Rokinon ebiggs mentioned is a favorite. I use my RF15-35mm f/2.8 there with some success.
Blurry on an R50 would translate to blurry on an R10 IMO. They are essentially the same camera with just a few different firmware and control differences. Blurry might be due to depending upon the camera settings and not being right for the situation. If you're shooting action you should set the shutter speed to capture it and maybe set ISO to auto and then aperture to get the lighting right. If you're shooting in a dark situation you could get some noise.
I'd say get the best lenses you can for your situation and go as cheap as you can on a camera. For your situation I'd consider a used RP to get into full-frame. In this forum (including myself) I think sometimes we get over-enamored of the so much better AF, etc. that Canon keeps whetting our appetites with. If you're starting out the RP is all the camera you really need to take some great photos. Sure, if you can afford to get better, get better.
I enjoy my R6Mark II and would pick it over the new R8 MarkII for the $100 difference personally for photography. I enjoy my R50V and would probably pick a R50 over the R10 and put the $320 price difference into lenses. I notice they are both out of stock on the Canon site.
The Canon RF 24-105mm f/4-7.1 IS STM is a great budget lens to consider. The Rokinon ($380), a RF 24-105mm ($460) and the R5 ($680) (or used RP at about the same price point) could provide barrels of fun for less than the price of the R8MarkII body alone. Sigma 16-300mm @$700 would be a way to get wider range at more $$.
That said, the "blurry" R50 shot and success with the phone camera indicate to me that we also need to deal with expectations of a dedicated camera doing the same "magic" that phone cameras do. They do not. Dedicated cameras still require learning the basics of photography and applying them to get the shot one can often get automagically with a phone camera.
>> Owns/Owned both Canon EOS mirrorless full-frame and APS-C cameras and associated RF, RF-S and EF adapted lenses - inventory tends to change on short notice. Same for flashes, tripods, bags, straps, etc.
Plus>> Canon imagePROGRAF PRO-1100 Printer. My photos are edited using no Adobe products.
>>The opinions and assistance are my own. Please don't blame Canon for any mistakes on my part.
