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RF 400, or EF 400 with adapter?

Started Jul 11, 2021 | Discussions thread
Vladyslav Kosulin Senior Member • Posts: 2,362
Re: RF 400, or EF 400 with adapter?

EF 400 2.8 and RF 400 2.8 are same price new.
If you switched to MILC, then RF 400 is obvious choice unless you already have EF 400 or can get it used for, say, 8K or less.
They are optically identical, and most specs are the same.
RF has 0.5 stop better IS, not sure EF with adapter can claim this 0.5 improvement as well.
RF 400 is compatible with RF 1.4 and 2.0 extenders. EF 400 with EF-RF adapter can use EF 1.4 and 2.0 extenders (not sure if this combo affects the AF speed). 
RF has focus distance window removed.

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Vlad

 Vladyslav Kosulin's gear list:Vladyslav Kosulin's gear list
Canon EOS R5 Canon EF 100mm F2.8L Macro IS USM Canon EF 16-35mm F2.8L III USM Canon RF 15-35mm F2.8L IS USM Canon RF 24-70mm F2.8L IS USM +4 more
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