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Teleconverters RF vs EF

Started 1 month ago | Discussions thread
J.K.T. Contributing Member • Posts: 512
Re: Teleconverters RF vs EF

Abbott Schindler wrote:

If I understand you correctly, you want to try this:

R series camera - RF Extender - RF-EF adapter - EF big white

This is a nonstarter: the RF Extender won't fit into the RF end of the adapter.

It is nonstarter with Canon adapter. Third party adapters can be modified to fit.

The combination works and  1.4x is optically (slightly) better than EF 1.4x III. EF 1.4x II is much worse. What you get is slightly better optics. What you loose is aperture number correction in EXIF and correct working of IBIS - the combination doesn't see the TC, so corrections are based on base lens focal length. With big whites that may not be critical as IBIS is relatively inefficient with those focal lengths.

If you want to use an Extender with an EF big white, you need to do this:

Camera - RF-EF adapter - EF Extender - EF big white.

Yes - this naturally works. As a side note - so does Camera - RF extender - RF-EF adapter - EF extender - EF big white. The combo still doesn't see the RF extender, though.

OTOH, I've tested, and extension tubes work both ways:

Camera - RF-EF adapter - EF extension tube - EF lens

Camera - RF extension tube - RF-EF adapter - EF lens

Those naturally make no difference, but if you try to add an extender to the mix, don't but the extension on camera side of extender.

 J.K.T.'s gear list:J.K.T.'s gear list
Canon EOS 7D Mark II Canon EOS RP Canon EOS R7 Canon EF 135mm F2L USM Canon EF-S 17-55mm f/2.8 IS USM +15 more
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