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R7 and CANON MOUNT ADAPTER EF-EOS R 0.71X - Consensus working?

Started 3 weeks ago | Questions thread
Steve Balcombe Forum Pro • Posts: 15,571
Re: Interesting oposite of the 1.4x extender.

Le Kilt wrote:

Steve Balcombe wrote:

Le Kilt wrote:

KevinRA wrote:

I've done some searching - and it appears the Canon MOUNT ADAPTER EF-EOS R 0.71X seems to work fine with the R7 - but very few reviews/reports - one here:

https://www.youtube.com/watch?v=t8mWggxotN8

Appreciate the answer is get the R6 in many instances not this adapter for R7 - but wondering if users out there have more experience of it - good or bad? Functional without issues?

I'd use it with the EF 70-200 f/2.8 II primarily on R7 or R10 - if my R5 had another lens on it and small in the bag.

Interesting adapter, the precise oposite of the more usual 1.4x extender.

If you want ot use full frame EF lenses on an R7, R10 or R50 without getting the extra reach - a 100mm stays just that, not becoming a 160mm field of view.

It doesn't fully compensate for the crop factor. The 100 mm lens becomes an actual 71 mm combination, which then has a 71 x 1.6 = 113.6 mm equivalent FoV. Seems picky I know, but the difference could be important to some.

True, it was designed for the EOS C70 which has a slightly wider 'Super 35mm' sensor than R7's APS-C.

This is true of course. I was curious to know the exact figures so I got the effective sensor size from https://www.canon.co.uk/video-cameras/eos-c70/specifications/. I know there is an issue with the different aspect ratio, but to keep it simple I'll just compare the diagonals, because that's the same as the image circle.

For reference, R7: 26.7 mm

C70 DCI 4K: 29.6 mm

C70 UHD 4K: 28.2 mm

Full frame lens with 0.71x reducer: 43.27 * 0.71 = 30.72 mm

So it still doesn't fully compensate, but it's much closer.

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