All of my EF and even my EF-S lenses work better on my EOS R5 than they did on my EOS 80D. I even use a 45 year old Minolta lens from a film camera. The EF-S lenses put the R5 into crop mode which has a few less pixels than the EOS 80D. I do not have any RF lenses.
Auto focus seems different to me on mirrorless than on DSLR.
The hawk was on a tree near my house this morning getting the first sun as it began to illuminate the treetops. It was cold here last night, so feathers were a fluffed a little. The EF 2x III extender also works well on the R5. The 1.6x crop of the R5 makes it easier to focus on far away small birds. I set white balance to "daylight". Eye focus found the hawk eye among the branches. I reduced the image to 75% and reduced the JPEG quality to 94 to make it small enough to upload here.
I was not able to use the same auto focus settings on the R5 as on my EOS 80D. The first few days were frustrating as I learned.
This is how the eye looks at 100%.
@Betjothomwrote:"Thank you for sharing your experience. The more I read the more I’m leaning towards a mirrorless. Thank you for posting the beautiful red-shouldered hawk photo as well. Birds are my passion."
"The learning curve will be a challenge."
I didn't find that at all going from the 5D mark IV to the R5 and R6, but my setup would probably be considered simplistic by some 🙂
We are birders first, but also flowers and insects. I hope you can swing for the R5 or R6 mark II and hopefully when you get some RF glass it can be L. When I was using the 5D mark IV, I used L glass, but my wife needs light weight, so she uses non L. The RF 100-400 is outstanding on the R6 and she gets really good results with that combo.
Here are some examples of small birds taken with the R5 and EF 100-400mm L II at 40'+/-. If you know warblers, you know most are 3-4" beak to tail. The spider was taken with the same lens at near minimum focus distance, zoomed to 400mm. That is one of the reasons I love the EF 100-400mm L II, its close focusing distance.
Newton
