R5 lunar photography with stacked EF extenders

BobKnDP wrote:

Bigger wrote:

(snip)

Aside from optimization for infinity focus, according to this formula, Nyquist limited sampling with a 600/4's 150mm aperture & an R5's 4.38um pixels would be minimum f/16, but oversampling by 2x is common, so f/32, which checks with your recommendation above. We could get a 600/4 up to f/16 with two 2x stacked converters, but as you say, that's probably pushing the limit of diminishing returns, so oversampling at the pixel level is not reasonably feasible with a photo camera & lens. That could be compensated somewhat by oversampling at the image level, i.e. just stacking more images, e.g., shooting 8k video as in the example here.

It's made more complex because the R5 uses a Bayer mosaic, plus some sort of antialiasing filter. I can't guess whether there would be a meaningful increase in resolution at f/32 over f/16.

The AA filter may also reduce the effectiveness of super-resolution techniques (like Drizzle).

Have any well-heeled astrophotographers had their R5s modified? Some might want the anti-IR filter removed (for H-alpha sensitivity, like the Ra), the anti-aliasing filter removed, and the Bayer mask removed (making a high-resolution monochrome camera). I have no idea which of those would be possible. Any would require adding some glass (window) to preserve the focal plane with respect to the camera flange.

Better buy a dedicated thermoelectrically cooled mono camera. Quite popular among enthusiasts because any filter within the sensitivity range can be applied.

Bayer matrix cameras have better resolution than most are aware of because sharpness data is applied from all four pixels in the Bayer matrix.

Diffraction limited resolution is a bit more complicated than just matching the air disk within a single pixel. My 2.4 micron pixel camera is fully diffraction limited at f/15. The ratio is linear so a 4.8 micron pixel camera would be fully diffraction limited at f/30.

Note the term fully diffraction limited.

Diffraction creeps in gradually and its effects are seen long before the system is fully diffraction limited. When fully diffraction limited maximum resolution is reached.