Need help deciding on a lens

[Lkcphotos31]

I am a sports photographer who currently shoots on a Eos R and an ef to rf adapter that connects to my ef 70-200 f/ 2.8 L IS USM, the first generation of 70-200. My current lens has a foggy not sharp look to it during low light so I am looking for a different lens, I cannot send it in for repair because it is too old and they don't service them anymore. I cannot decide between the rf 70-200 and the ef 70-200. If anyone has any advice let me know! I am also looking at a 24-105 f/4 for the upcoming basketball season so if anyone has strong feelings about this lens please share. 

[wq9nsc]

If your images are sharp during better lighting, the lens isn't the issue.  The "foggy" look in low light is probably a result of a higher ISO and the noise reduction needed to mask the noise artifacts.

I use an EF 70-200 f2.8 IS III now but I still have the 70-200 f2.8 non-IS I bought with my 1D Mark II back in 2005.  I expect I would have to do some serious pixel peeping to see a sharpness difference and I shot plenty of low light sports with the older EF 70-200 before buying my new version.

What are your exposure settings when you get the loss of sharpness?

Rodger

[deebatman316]

@wq9nsc  I do agree with you on this. The EOS R was released in 2018 the image sensor technology has greatly improved in 6 years. The high ISO is likely causing the "foggy" looking images not the lens unless its full of fungus or has optical issues. I could see a very old film era telephoto lens having issues on a new camera. Like my old EF 70-210mm F/4 AFD lens from the beginning of the EOS line.