Sun disc of December 21st
- krakatoa1883
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Sun disc of December 21st
A very unfortunate month for solar observing and imaging, bad weather and office work kept me away from my telescopes, the Sun low in the sky is turbulent most of the time lowering image contrast and shaarpness. Moreover after careful testing I discovered to be one of the few unlucky men that got a pressure tuned LS50 with some problems of uniformity in the field of view. The scope is usable but could have been better.
Below are my images of today in poor seeing conditions and slightly hazy sky. Thanks for looking.
Below are my images of today in poor seeing conditions and slightly hazy sky. Thanks for looking.
- Attachments
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- sun20171221_filament.jpg (77.72 KiB) Viewed 384 times
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- sun20171221_FD_H.jpg (67.61 KiB) Viewed 384 times
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- sun20171221_FD_CaH.jpg (68.04 KiB) Viewed 384 times
- ffellah
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Re: Sun disc of December 21st
Raf: these are good images despite the circumstances and conditions...
Happy Holidays !
Franco
Happy Holidays !
Franco
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Re: Sun disc of December 21st
Raf that Daystar Ca came up well.
- Montana
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Re: Sun disc of December 21st
Looks like a nice active region, I haven't seen the Sun for days so it is nice to know what it looks like

If you are unhappy with the scope have you spoken to Lunt? is there anyway to fix it?
Alexandra


If you are unhappy with the scope have you spoken to Lunt? is there anyway to fix it?
Alexandra
- krakatoa1883
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Re: Sun disc of December 21st
Thanks to all for appreciation.
@Alexandra: some months ago I have been offered a LS60 with tilt tuning and a LS50 with FT focuser, and eventually I purchased the latter as I expected the pressure tuning be able to deliver more uniform images. In my sample, however, the sweet spot is slightly shifted toward one side of the field so that the area of best contrast is not at the very centre. Visually this is not important and even difficult to note, but with the CCD the full disc always shows one side of the Sun to be brighter and contrasted than the other. Turning the handle in or out makes the disc more uniform but the best position for uniformity doesn't correspond to the best tuning for CWL. Based on what I have read on the Internet this behavior is still within the quality bar of the product and it is not covered by warranty.
@Alexandra: some months ago I have been offered a LS60 with tilt tuning and a LS50 with FT focuser, and eventually I purchased the latter as I expected the pressure tuning be able to deliver more uniform images. In my sample, however, the sweet spot is slightly shifted toward one side of the field so that the area of best contrast is not at the very centre. Visually this is not important and even difficult to note, but with the CCD the full disc always shows one side of the Sun to be brighter and contrasted than the other. Turning the handle in or out makes the disc more uniform but the best position for uniformity doesn't correspond to the best tuning for CWL. Based on what I have read on the Internet this behavior is still within the quality bar of the product and it is not covered by warranty.
Re: Sun disc of December 21st
VNice images under the conditions
- eroel
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Re: Sun disc of December 21st
Raf;
Well done.
Wish you the best for Christmas and New Year, from N.Y.,
Eric.
Well done.
Wish you the best for Christmas and New Year, from N.Y.,
Eric.
Re: Sun disc of December 21st
Hi Raf,
Nice collection. There is also some uneveness in my Lunt 50. Got used to it by now.
Alfred
Nice collection. There is also some uneveness in my Lunt 50. Got used to it by now.
Alfred
- krakatoa1883
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Re: Sun disc of December 21st
Thanks for comments. Today AR12692 seems larger than yesterday, with 17-18 small spots (at least two of them with a small penumbra), enjoy the view if you can.
Merry Christmas to all of you!
Merry Christmas to all of you!
- Carbon60
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Re: Sun disc of December 21st
Good images, Raf. It's so difficult this time if year in the north. Nicely done.
All the best for the season.
Stu.
All the best for the season.
Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/
- marktownley
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Re: Sun disc of December 21st
Nice shots! Can you try a different blocker with the 50?

http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
- krakatoa1883
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Re: Sun disc of December 21st
Thanks to all.
Mark, I have only the BF of the Quark. It works fine with my Lunt with no unevennes in the images, but I don't have a separate barrel to use it without the Quark, and this prevents making FD images. I am planning to purchase a larger one from Andover together with a T-mount barrel from Edmund Optics.
Mark, I have only the BF of the Quark. It works fine with my Lunt with no unevennes in the images, but I don't have a separate barrel to use it without the Quark, and this prevents making FD images. I am planning to purchase a larger one from Andover together with a T-mount barrel from Edmund Optics.
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