15th June 2020 Calcium-K and the end of AR2765 from the disk.

[EGRAY_OBSERVATORY]

With very-clear skies this morning in S.E.England, but turbulent-seeing and in very hot conditions of over 35-degrees C. in the observatory, with all the fans pushing the hot around, this CaK image will be the last of the AR2765 region (unless it reappears - round the bend again)...

More to follow
Enjoy
Terry

[EGRAY_OBSERVATORY]

close-up of AR2765

[eroel]

Terry:
Very nice CaK shots.
Best wishes,
Eric.

[EGRAY_OBSERVATORY]

Thanks vm Eric.
And more to follow

Regards
Terry

[dhkaiser]

Not to take away from your nice images, I just have a hard time adjusting to a blue sun. :-)

[EGRAY_OBSERVATORY]

Thanks Dan for the "hard time" info, but as you know, Cal-K is a deep-hue of blue and often makes for a better show of the surface-detail in blue, although other colours can also add to the hysteria !!

Anyhow perhaps the next image here might change all that...

Regards
Terry

[DeepSolar64]

Yes, it's almost gone.

[marios i.]

Lovely!

[EGRAY_OBSERVATORY]

Thank you Martin.
Hopefully the next image will be a tad better.
Of course I am experimenting with different processes - so any suggestions always welcome - thanks

Regards
Terry

[EGRAY_OBSERVATORY]

and

[Montana]

Some of your best images so far Terry, super work

Alexandra

[marktownley]

Nice set Terry! When you say the number of frames on the image is this the number you stacked or how many you captured?

I don't think we'll see this active region for another rotation, he's being slowly but surely decaying as he transited the sun.

[David_The_Bears_Fan]

Great set Terry. There were a lot of proms on show in ca-K yesterday and many of them are still showing this morning.

[yltansg]

Hi Terry,

Good job in shooting the last scene of the AR. I recorded some CAK videos of it yesterday too. Will process soon.

Alfred

[EGRAY_OBSERVATORY]

Many thanks Alexandra, Mark, David and David.

Alexandra, indeed now I'm in another stage of zooming-in for closer detail by whatever means - when the weather permits.

Mark, the number of frames mentioned is the number captured and I somewhat agree with you about any return of the AR., but it has happened...

David. that's correct and gave a good opportunity to practice some close-up's too.

Alfred, looking forward to (if not already) seeing your images - thanks.

Unlikely to get any images over the next day or so as heavy thunder/rain likely soon.

Terry

[marktownley]

How many frames are you stacking Terry?

[EGRAY_OBSERVATORY]

Hi Mark, As long as the preview of the AVI is a steady-disk or disk-edge, I'll stack usually either 100, 200 or now 500-frames.
There obviously a reason for your questions Mark, so please 'spill the beans'' ???

Regards
Terry

[Carbon60]

Good progress, Terry.

Stu.

[EGRAY_OBSERVATORY]

Thanks Stuart. Am trying through some difficulties, but hoping for some improvements shortly...

Regards
Terry

[marktownley]

I was trying to work out how many frames you were capturing in a typical run, and then out of these how many were stacked.

[EGRAY_OBSERVATORY]

Ok Mark, I still have the AVI files, so shortly will do a repeat run of say the 500-capture and see if I can get that answer for you.

Cheers
Terry

[EGRAY_OBSERVATORY]

Hi Mark,
The first CaK image was a captured x 500 frames, but AS shows that I hadn't changed the stacked-rate from 200 frames.

So I have now processed the original AVI file of 500-frames and re-stacked it to 500-frames, with the included image here.
Sorry, I didn't Flip it - first.

Cheers
Terry

[marktownley]

Hi Mark,
The first CaK image was a captured x 500 frames, but AS shows that I hadn't changed the stacked-rate from 200 frames.

So I have now processed the original AVI file of 500-frames and re-stacked it to 500-frames, with the included image here.
Sorry, I didn't Flip it - first.

Cheers
Terry

So, this last image is 500 frames captured and all 500 stacked? If that is the case using that method you are always going to get blurrier images than you could by stacking fewer images - whole point of lucky imaging is to shoot considerably more frames than you need and then let the stacking software only stack the sharpest ones.

I'd try capturing 1000 and stacking 100. For 60mm aperture the seeing should cope in Ha, the proms just look a little soft to me, I wondered if the focus wasn't quite on?

[EGRAY_OBSERVATORY]

Thanks very much for the very useful advice Mark.
I have normally been capturing 100 or 200 frames and that is why the AS program was only stacking a max of 200-frames for the 500-frame 1st image in this blog.
This last image of the same capture, has just been stacked to 500-frames and doesn't seem as good as the first, using the same processes.
I just wanted to see what capturing 500-frames would do, but obviously not necessary or worth-while either.

So I will capture just the 100-frames as normally and previously done. I do of course understand that unless the seeing as absolutely perfect and steady too, then taking too-many frames could make for blurred images. Not necessarily the same for night-imaging - of course...

As far as the focus is concerned, I am pretty careful about getting it fine and with all three scopes having FeatherTouch (the Orion/WL has a similar focuser), there isn't usually a problem. To add remote-controlling of the focusers would entail some physical-difficulties between the three scopes.

But (and there's got to be a but) the large remote PC monitor's' connection from within the PC itself has failed last week and I am in the process of replacing the PC (which has other USB problems etc., including a small screen), with a high-spec PC with a much larger screen and also should allow for the remote giant-screen to be much closer to the scopes for accurate focusing etc.
(I already have different glasses to assist, but ideally I need an assistant instead, so have to do what makes things easier the best way possible).

Equally I have many options including filtering and also more work with the WL's F-Stop disks to complete - to improve Solar-imaging techniques with the Tri-scope assembly and awaiting every opportunity - when the weather allows.

Also I thought I had solved the NR snag in Ha by simply swapping the two identical-cameras between the Ha and Cal-K scopes, but alas there is still a less of a problem with the Ha imaging, where at least I can darken-out somewhat to get-rid of 'em. I am looking at replacing those Altair GPCAM's cameras with others that I have been reading about - in the last few hours. There is a suggestion that CMOS cameras can have this problem compared to CCD cameras, so the change is under consideration... \you know-doubt know more about this problem...

Always like any advice Mark, so thanks for those from you and of course everybody.

BEST WISHES & CLEAR SKIES
Regards
Terry

[EGRAY_OBSERVATORY]

Correction Mark,
I misread your last sentence - so to capture 1,000 frames and stack only 100 of those.

Thanks
Terry

[MapleRidge]

A fine collection of images Terry

Brian

[DeepSolar64]

Very nice work Terry.

[marktownley]

One more Question Terry, what sort of exposure time are you doing with your prom shots?

[EGRAY_OBSERVATORY]

Thanks Brian and DeepSolar64.

Hi Mark, I'll have to get back to you for those times during the next session, as I can't confirm that from the Camera Setting - notepad.

If I may, that will probably be by email ??

Regards
Terry