Thanks everyone, I really appreciate your support.

Christian,
Good resource.
I'm a little surprised with the Baader D CCD result.
I use this as an ERF for the CaK filter set up, and thought the transmission at 393nm was higher.
https://www.baader-planetarium.com/en/b ... blue).html

Thanks guys. Appreciate your encouragement and support.
Still cold wet and windy down here.

Thanks guys. Appreciate your encouragement and support.
Still cold wet and windy down here.

Between heavy/ light cloud managed to image the new AR 2767. Genesis 100/500, Baader solar wedge, Baader x2.25 barlow, ASI 1600. I'm sure it would look even more impressive under good conditions. The surrounding faculae is pretty bright. If the weather improves I'll try some Ha and CaK. Sun_103410_c...

Between heavy/ light cloud managed to image the new AR 2767. Genesis 100/500, Baader solar wedge, Baader x2.25 barlow, ASI 1600. I'm sure it would look even more impressive under good conditions. The surrounding faculae is pretty bright. If the weather improves I'll try some Ha and CaK. Sun_103410_c...

Marlin,
I tend to look at the broadband Baader K line filter as augmenting the White Light filters like The Continuum filter.
The bandwidth is not tight enough to really bring out CaK data.

Don't know.....
Need to think about it.
Which grating are you using?
What's the focal length of the collimator?

Wah,
Shouldn't be any coma...but astigmatism, probably; could also be vignetting from the pick off mirror. Remember the f ratios must match.

Wah, Always challenging experience! I try to get the spectrograph section working first. Giving a clean, well focused H alpha line. Then work with the slit to give minimum usable gap..... Final the scope should work at the same focal ratio as the spectrograph ie f10 scope to f10 spectrograph. My "ch...

Wha,
Thanks.
I'll try that as soon as the weather allows. I'm testing a new SHG (hence the previous out of focus result) hopefully the next results will be better.

Phil, SLiM software developed by Wah! provides the means to convert an AVI/SER video of a spectral line to a spectroheliogram. It can correct for slant and smile and offers different extraction widths. In my experience it needs the video cropped to the line of interest (VDub) prior to using. Slim_sc...

Wah,
Error message shows lines 1753, 2044, 3286
I've attached a copy of the error screen. ken

Wah, Unfortunately it still shows the same error messages. Looking at the "Unhandled exception" - Object reference not set to an instance of an object There seems to be references to d:\projects\SLiM_RemovedProcessing\form1.cs. I assume this was your working directory???? Let me know how I can assis...

Terry,
I'd be interested to hear your results with the front AR window removed. (I've tried this previously)
The sensor cover plate cannot be removed from the chip. The thickness of this cover and the design of the chip contribute to the Newton Rings.

Wah,
Downloaded OK
I'll try it ASAP and give you feedback.
Many thanks,
ken

I’m in transit....I’ll download later when I get home.
Many thanks.

Wha,
Thanks for the feedback.
Your continued support for the SHG is appreciated.
Look forward to trying the new version.

The front camera windows are usually AR coated nowadays. My ASI 174 and ASI 1600 are both AR coated.
The window to to far from the sensor chip to cause NR. These are generated by interference between the sensor cover plate and the chip itself.

Wah,
I've sent you an email with the SLiM errors, and sent a copy of the AVI file (930Mb) to dropbox
https://www.dropbox.com/s/rrjtee31vwf1h ... p.avi?dl=0
Ken

Franco,
Great result, excellent presentation.
If that's "below average seeing" just wait to you visit over here in the Bellarine....I'll show you BELOW average seeing.
Well done.

Franco,
Great result, excellent presentation.
If that's "below average seeing" just wait to you visit over here in the Bellarine....I'll show you BELOW average seeing.
Well done.

Bob,
Great image, well done.
Is that a 178 colour camera?

Hmmm I have the ASI 174MM, the ASI 1600MM and the ASI 1600MM-C The ASI 174 is OK, but the pixel size (5.86 micron) make it more suitable for long focal lengths - the ASI 1600 (3.6 micron pixel) I find more versatile in my gear (and give full disk options). There's no significant difference between t...

Very nice!
Question: What's the darker "thumb print" at 7 o'clock to the sunspot??