Since I have been using the Canon Rf 800mm f/11, I wanted to compare it to my older Sigma lens.  I bought the Sigma 50-500mm F/4.5-6.3 Apo Dg Os Hsm several years ago.  It was sharp and pretty fast for the time.  Of course, a year later, Sigma started introducing its Art lenses and ultimately replaced this lens with the Sigma 60-600mm f/4.5-6.3 DG OS HSM in both a Sport & Contemporary versions.  I have continued to use the lens with my Canon 7D Mark I & II.  But, how would it work with the new Canon R5?

Using the Canon Mount Adapter EF-EOS R, the Sigma 50-500mm provided similar performs to the Canon EF mount cameras.  The above photo was taken hand-held at 413mm, F/6.3, 1/1600 and ISO12800.  Yes, 12800 ISO!  Why? Not sure. The R5 set the ISO.  I was focusing on the shutter speed and didn’t look at the ISO until later. 

Eye Tracking was spotty with the R5. Sometimes it would work, but it mostly fell back on the AF Selection.  But, it did provide a sharp focus.

Here are some additional photos: