Hallo,
my name is Joerg and first I must say I’m am really impressed what you are doing.
My intention is to make flicker free (glitch free) time laps, special in the wadden sea (mudflat, tideland). I´m using the S110 and G1X
http://youtu.be/ZyOeVs3Ha6gI hope my English is not too bad and you can understand me.
What I learned after 50000 shots was:
1) Do not use the automatic exposure of the camera
2) Underexposure can be better corrected in post processing than Overexposure
3) Closed aperture makes bad flicker in time laps
https://www.youtube.com/watch?v=PVnqd4f3KmkWhat I did before:
I always make time laps with open aperture to avoid aperture flicker.
Then I wrote my own Script with a Tv gain control. I got the Tv Value witch the camera calculated after half press and analyzed this value. Then I overwrite the Tv camera value with my Tv value. I tried to keep my Tv value in an area from +- 1/3 Ev of the camera Tv value. When the Tv value from the camera was outside this values, I start a counter. When the value was inside, I set the counter to zero. After a specified counter value, I changed my Tv value in 1/3 Ev steps. Of course, I have to run it with –Ev to avoid Overexposure. I also planned, to use the histogram to avoid Overexposure. This algorithm is very easy and works very well.
What I really miss are long Tv values to smooth the waves. When I close the aperture with my script, the camera always opens the aperture for measure, which makes bad flicker.
No I found your script rawopint, which have for me the advantage, that the camera does not change the aperture. It was not easy to find it with a title like ‘proposal - script shooting hooks’. I have not known was hooks before….
Yesterday a tried to run the script. Well I have not really understand every parameter yet (which effect has a larger meter area), so I run mostly with defaults. I make a Test against the sun. Basically the result was Ok.
The first thing, which I was wondering was, that the script change the ISO after first shoot from ISO 80 to ISO 160. The Tv values where around 1/30s. Any idea?
Then all pictures had too much Overexposure. Ok the default was 3%. That’s already a lot. I analyzed the pictures (values = 255) and find more the 4%. The different was, I take pictures in 16:9. The JPG includes fewer pixels. This is also the reason, why I can’t see the bar in the debug info near the top.
Next time I will run it with 1% Overexposure. But why I can’t set Overexposure to zero? Especially for time laps with the moon it should be a nice option to have no Overexposure and see structures is the moon. I tried it with my script but unfortunately the moon was less than 0.5% of the picture and the normal histogram delivers only steps in 1%.
What would be also nice to have?
ui_shots=0 for endless shoots.
And a safety mode for the auto focuses like:
get_focus_state() == 0 -> set_focus(get_dofinfo().hyp_dist)
This help you really, when you start a night or with fog. I lost a few series because of focus problems.
I’m looking forward to make more tests with your script….
Greets Joerg.
