umphotography wrote in post #18773204
Well if this does not convince you that the EOS R does TC's well.....Nothing will
AF-wise, f/16 in the viewfinder is a great thing. It's one of the R's drool factors for me, but not enough to make me bite right now.
Optically, however, there is nothing special happening here, on the camera's end. The lens and TCs, the lack of mirror slap (possible in Live View with DSLRs), the shadow-casting sharp off-center light on the moon, the clear earth atmosphere, and the photographer's technique and tripod give most of the capture's value.
The camera's pixels are fairly large to begin with, and nardes downsized to 50%, making the results like they came from a crop from a 7.5MP-native FF sensor (with a half-strength AA filter and reduced Bayer effect), which would be hard pressed to show moderate optical softness. The larger your real pixels (or virtual ones through downsampling or binning), the less pixel-level sharpness drops when you introduce another 1.4x worth of teleconversion. That is not a quality of the bigger pixels; it is the flip side of the fact that large pixels hide fine optical details more. If adding another 1.4x makes the 80D look a bit less pixel-sharp, but not the R (with half the pixel density of the 80D), then the 80D is not failing; it is succeeding better in capturing everything the lens throws at it, which only happens completely with very soft neighbor-pixel contrast. Pixel sharpness at 100% in RAW captures is a sign that your Pixels are too big, and throwing details away.
Anyway, as we move towards good AF (and good manual-focus aids) at high open f-numbers, maybe we'll start seeing some serious TCs stronger than 2x, or lenses like 800/11. Things could get interesting in the magnification vs auto-focus department. The moon fills the height of a FF sensor at about 2640mm.