If it works this way, you should be able to find this point just by adjusting the Tv value, starting with one that gives you Av < 8.
I want to understand some basics about ND…How does the cam made exposure measure in AV mode when I set AV=8.0? My understanding was, the cam opens aperture, do the exposure measure and closes only aperture while shooting
If it's using ND, it seems like there should be a light level (or Tv value) where the ND goes in and the Av drops below 8, likeAv = 8, no NDmove to 1 stop brighter lightAv = 4 (- 2 stops), ND in (+3-ish stops)
=press'shoot_half' repeat sleep(10) until get_shooting() sleep(1000) set_nd_filter(1) sleep(1000) set_nd_filter(2) sleep(1000)
Hard to know much based on sound unless you have a way to verify that you can distinguish between the aperture and the ND. On the G7X, I can tell they are different because putting in the ND manually in the UI makes a distinct sound.
=press'shoot_half' repeat sleep(10) until get_shooting() sleep(3000) set_nd_filter(1) sleep(3000) set_nd_filter(2) sleep(3000)
I changed only sleep to 3s from your code. You can see that ND goes in and out. But you see here also three different brightness steps (off,in,out).
In the second part I tried to change the brightness slowly until I hear a sound. But at this time the brightness did not changed on live view. So not sure what that means. May be the cam compensates the ND step immediately when ND goes on and off?
I think this is normal when the camera puts ND on in live view. It's the same on my ND only cameras like elph130, firmware knows the ND value and adjusts the live view exposure at the same time.
But that is different on S110 and G1x . If I switch ND on, the live view goes just dark and got normalized after 1s.
On both elph130 and d10, I noticed that the zoom level seems to change very slightly with/without ND.
align_image_stack -c 24 -i -x -y -a aligned_ *.jpg
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General Help and Assistance on using CHDK stable releases
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General Discussion and Assistance