Just updated the CHDK scripts page related to my Landscape Bracketing Script, as I've added a new feature to the no-M3 version.
Instead of only allowing you to take an ETTR sky bracket at infinity, the script now allows you to also carry out a simulated ND capture at infinity.
The use case being, say, wishing to have blurred flowing water.
The script allows you to simulate either a 2, 3, 4 or 5 ND filter, ie with 2, 4, 8, 16 or 32 images.
You can read more here:
https://photography.grayheron.net/2021/06/chdk-landscape-bracking-script-latest.html