Canon R7 R7 + Speed booster + f/11

[dougsmit]

Since the R7 has come out we have seen reports of people using the 0.71x Speed Booster to turn a full frame lens into a faster cropper and we have seen people happy that the 'reach' of their long telephoto, especially the lower priced f/11 models, was increased by the 1.6x crop factor. What I have not seen is a report of someone trying the Speed Booster on an f/11 turning it into an f/8. Those of us who shoot distant birds in less than the brightest light might be willing to settle for only 600mm if we could get that extra stop of exposure. Some of my photos would have been improved if I had to crop less. Others would have preferred to get a lower ISO or faster shutter. Has anyone tried this?

 

[Jake Shoots Birds]

So I've only been with Canon a year and all my equipment is mirrorless with an RF mount. This morning is the first time I've heard of it (YouTube recommended video) and now I'm seeing this. What I don't seem to be able to find is a strict RF mount speed adapter, only one built in to an EF to RF converter. Can anyone point me to one?

 

[ctitanic]

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Taken with a vitrox speed booster.