A large dark filament 2018 08 27 280mm scope
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
A large dark filament 2018 08 27 280mm scope
Hi all,
Here is the image of a large dark filament I have captured early morning yesterday, August 27 2018.
Seeing was good for H-a and 280mm aperture. You can see all the finest details at the limit of 280mm aperture resolution and 0,2A single cavity etalon. Full size ARIES DERF was used in a front of th etelescope.
There were 4000frames stacked out of 4000frames recorded.
Thanks for looking.
Valery
Here is the image of a large dark filament I have captured early morning yesterday, August 27 2018.
Seeing was good for H-a and 280mm aperture. You can see all the finest details at the limit of 280mm aperture resolution and 0,2A single cavity etalon. Full size ARIES DERF was used in a front of th etelescope.
There were 4000frames stacked out of 4000frames recorded.
Thanks for looking.
Valery
- Attachments
-
- 2018-Auguest-27-05h-48m-280mm-ARIES-DERF-0,2A-Basler-1920-155.jpg (495.87 KiB) Viewed 1669 times
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- Carbon60
- Way More Fun to Share It!!
- Posts: 14209
- Joined: Wed Mar 07, 2012 12:33 pm
- Location: Lancashire, UK
- Has thanked: 8418 times
- Been thanked: 8163 times
Re: A large dark filament 2018 08 27 280mm scope
A very nice filament image, Valery.
Stu.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
Re: A large dark filament 2018 08 27 280mm scope
1. It is not a PST etalon.TheSkyBurner wrote: ↑Tue Aug 28, 2018 2:05 am How can you conclude that the pst etalon is .2@ without an ultrahigh resolution carey spectrometer?
2. I have a solid etalon measured by the manufacturer at 0,25A. This one is condiderably more contrast and shows less double limb.
It also shows less double limb and a bit more cover the pebumbra than a 0,2A etalon in hands of another observer.
So, with a good portion of confidence I have concluded that this etalon is at least 0,2A. I personally believe that it is even a bit narrower.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- Montana
- Librarian
- Posts: 34563
- Joined: Mon Oct 17, 2011 5:25 pm
- Location: Cheshire, UK
- Has thanked: 17672 times
- Been thanked: 8792 times
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
Re: A large dark filament 2018 08 27 280mm scope
The manufacturer of a 0,25A filter measured the bandwidth with their spectrometer and in the parallel beam.TheSkyBurner wrote: ↑Tue Aug 28, 2018 5:33 pm A: Oh i see! Well if you have a .025nm filter that you know was manufactured just for you, and running at that high of magnification it is way less than .2a
B: I only ask because certain details seem to be missing for that narrow of bandwidth. You should inquire what F/ratio the filter was measured at by the manufacture. If the filter operates f/8 to be .025nm for example.
viewtopic.php?t=22979
In my scope it works at about F/45. My best filter outperforms this 0,25A without a doubts, while not much.
I also compared this 0,2A etalon against two air-spaced 0,7A double stacked. Close enough.
Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- marktownley
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10247 times
- Contact:
Re: A large dark filament 2018 08 27 280mm scope
Yes we are!
Super shot Valery!
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!
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
Re: A large dark filament 2018 08 27 280mm scope
This is a mica based etalon.TheSkyBurner wrote: ↑Tue Aug 28, 2018 10:19 pm is it a single filter or is it an fabyperot etalon? can you share a photo of it?
we are all curious what you are up to.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- marktownley
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10247 times
- Contact:
Re: A large dark filament 2018 08 27 280mm scope
Solar spectrum?
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!
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
Re: A large dark filament 2018 08 27 280mm scope
This is a DayStar Quark very carefully selected among too many samples to count. During two years. CWL uniformity just is not within +/- 0.05A. With a neutral gamma setting the unifomity of 90%+ of filter aperture is very good flat. Only with contrast rised to a high enough gamma, I can see some smooth brightness variations. Visually this sample beats (hands down) any single stack etalon include carefully selected PST etalon (which shows equal pictures with 0.3A mica based etalons from both main manufacturers). For visual observations I really do not need a DS. No need a DS when image the Sun on 80% of the disk and promineces. Only near the limb I feel I need a DS.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- krakatoa1883
- Almost There...
- Posts: 1041
- Joined: Sat Jun 11, 2016 9:41 am
- Location: Mediolanum
- Has thanked: 153 times
- Been thanked: 496 times
Re: A large dark filament 2018 08 27 280mm scope
Looks impressive.... how did you calculate resolution ?
Raf
My solar images and reports with articles on solar equipment
My solar images and reports with articles on solar equipment
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
Re: A large dark filament 2018 08 27 280mm scope
It is easy. I know the FL, I know the scale arc sec per pixel, I know the smallest details resolved. Compare it with theoretical resolution.krakatoa1883 wrote: ↑Thu Aug 30, 2018 4:58 pm Looks impressive.... how did you calculate resolution ?
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.