R5 lunar photography with stacked EF extenders

Started Dec 14, 2021 | Discussions thread
OP Bigger Contributing Member • Posts: 664
Re: R5 lunar photography with stacked EF extenders

Leeuw wrote:

Canon’s 2x ii extender can be stacked with the type iii extenders. Having 2x ii, 2x iii and 1,4x iii gives me several options to combine with my EF 600 f/4 II and R5.
This thread inspires me to start some experiments. For instance how would the 2x + 2x double stack perform. Maybe a bridge too far but why not give it a try.

What I have found from my terrestrial testing is that the EF 600 f/4 II definitely benefits from a 2x converter, even on a 5DsR with 4um pixels. The added 1.4x seems to help a little, especially on an R5, but I don't think there is any resolution left to get beyond that with ~4um pixels. The 2x + 2x might help with an R6 or other ~6um pixel camera, though.

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