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Teleconverters RF vs EF

Started 1 month ago | Discussions thread
SafariBob
SafariBob Veteran Member • Posts: 3,852
Re: Teleconverters RF vs EF

But one strange anomaly still exists (and this was pointed out by one person in this thread). By design, a RF tele won't fit on a EF2RF adapter. But yet the RF 600F4 and RF 400F2.8 lenses violate this design by allowing a RF tele to fit on the back of the (built in) EF2RF adapters on those 2 lenses. This tells us that Canon modified the EF2RF adapter that they welded onto the RF 600F4 and RF 400F2.8 lenses.

don’t understand what this means.

I think your original questions show correct understanding, but I am not sure your conclusion is correct. Look into extension rings

 SafariBob's gear list:SafariBob's gear list
Sony RX1 Sony a7R II Sony a7R IV Canon EF 400mm f/2.8L IS USM Sony 70-400mm F4-5.6 G SSM +3 more
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