[alpal]

Originally Posted by ericwbenson

Hi Allan,
Using the shutter to select good/bad times of seeing/wind was discussed as far as back as 2006 and implemented by Steve Bell around 2009.
IIRC it doesn't really work very well (minor improvement sometimes) as compared to lucky imaging where the improvement can be substantial if the exposure is short enough (milliseconds). Of course the read noise at such short exposures is a real bummer and a 'zero cam' is required

If you have access to the SBIG yahoo groups archive here are some references:

https://groups.yahoo.com/neo/groups/...essages/141713

https://groups.yahoo.com/neo/groups/...essages/208793

https://groups.yahoo.com/neo/groups/...essages/207977

If you can't access them I could possibly copy/paste the text...if that's allowed?

Regards,
EB

Hi Eric,
Thanks - I can't view those links.
I know that lucky imaging is better but of course it only works on bright targets.

I just noticed on my last imaging session that although my PHD dx/dy
guide graph was saying 0.19 rms to 0.25 rms there was an occasional
blip where the guide graph went above one division.
I thought - wouldn't it be nice to watch the line increasing towards
one division & close the shutter for 1 to 3 seconds to not collect that bad data.
Keep the shutter closed until the guide graph had stabilised.

It seems so simple that it must work.

It's possible that I could wire in something - a cable with
a button on the end to close the shutter on my QHY9 & do it manually
as there doesn't seem to be any software that can perform this simple process.

cheers
Allan