Ditto. I usually use them on my 600mm also, or at least I used to. I do have the Meike tubes that I frequently use with the 100-500 for wildflowers. Having that extra bit of close focusing distance often does make a difference. Those Meike tubes aren't especially well made, but the lens functions work perfectly. I wouldn't go on a hike carrying the camera with the lens attached to the camera via those ext. tubes, but they are handy. Canon could easily make some tubes built to the same standards as their EF-RF adapters. I would buy those immediately (along with an angle finder!).I suspect that extension tubes were never very popular, and they're likely pretty far down on Canon's priority list for the RF mount. I think they're of even less importance considering that Canon is adding semi-macro capability to many lenses that would have formerly have been used with tubes, e.g the RF 24/1.8, 35/1.8 and 85/2 all go to 0.5x native magnification.
I do have the EF versions of the 12 and 25mm tubes, which I use mainly for closer focus with the 600/4 II. Although I was not inclined to trust a 3rd party tube as the bridge between a $13K lens and a $6-7K body, for what is probably a more typical extension tube use case (increased magnification for standard lenses) a 3rd party option would be fine. There are already several of those for the RF mount, e.g. Vello (12 + 20 set), Kenko (10 + 16 set), Meike (13 + 18 set) and Fotodiox (15 and 35, separate).
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