R5 lunar photography with stacked EF extenders

Started Dec 14, 2021 | Discussions thread
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Bigger Contributing Member • Posts: 664
R5 lunar photography with stacked EF extenders
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There was some interest in Stacking RF extenders in an older thread that focused a lot on maximum focus distance. So, I thought I would start a new thread on stacking EF extenders on RF bodies for lunar (and planetary) photography. Here's a sample image taken this evening:

EOS R5 + EF 1.4x iii + EF 2x iii + EF 600mm f/4L IS II; 1680mm @ f/11, MF, ISO 100, 1/20s, 1:1.6 crop in body, 5088 x 3392 uncropped .jpg from .cr2 raw via Lrc.

Based on my testing, the EF600/4 II has resolution to spare with the 2x converter as evidenced by aliasing a Siemens star beyond the Nyquist limit, so it's a good candidate for stacked extenders. Not that this sample is demonstrating any kind of technical excellence, but I think it shows the lens holds up well with stacked extenders. It also shows how the moon fills an APSC frame at 1680mm.

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