Solar Ha April 26th

[Space Cowboy]

First time I've had the Coronado PST out under a cloudless sky without dodging the clouds! Just a shame those magnificent proms have gone!

2 versions of the same shot taken with colour QHY5L-II again using the drift method to capture the whole disk without needing a mosaic.

[Freddie]

Nice shots Stuart. The first has pretty good even illumination for a PST. As you say, shame some of the recent features have now gone.

[sologuitarist61]

Well done - great images

[Space Cowboy]

Cheers Freddie! Thanks Richard!

[michael.h.f.wilkinson]

Good catches. I do wonder if the etalon was slightly off band (tuning can be tricky).

[Pete Presland]

Thats come out pretty well with some detail. What is the "drift method?"

[Space Cowboy]

Thanks Michael are you referring to the lack of contrast on the right hand side? I've noticed this on all my images. How do you go about tuning its something I know nothing about?

Pete I can get about 90% of the disk on screen in one shot so I shift the image with the hand control during capture and then select "expand" in AS!2 so it stacks the whole disk.

[Pete Presland]

Thanks Michael are you referring to the lack of contrast on the right hand side? I've noticed this on all my images. How do you go about tuning its something I know nothing about?

Pete I can get about 90% of the disk on screen in one shot so I shift the image with the hand control during capture and then select "expand" in AS!2 so it stacks the whole disk.

Very interesting! so i am thinking that i could probably do a 2 frame mosaic using this technique.

[Space Cowboy]

I suppose it depends how long your avis are Pete. I can get the extra 10% in a 20-30 sec avi but if the avi is much longer I would imagine you could cover even more area provided you don't move too quickly.

[Pete Presland]

If these clouds ever clear i might find out   when you select "expand" in AS!2 are you using a single alignment box?

[Space Cowboy]

No I use multi alignments in size 200......about 40 odd APs. As long as the image drifts slowly AS!2 can handle it.

[michael.h.f.wilkinson]

May I suggest using smaller alignment points? I use size 50, resulting in hundreds or thousands of APs, but it gives sharper images (at the expense of a bit more computing time)

[Space Cowboy]

True Michael though I'm not sure that will work as well with a moving image but its worth trying.