Search found 29285 matches

by marktownley
Fri Dec 04, 2020 6:12 pm
Forum: This is SolarChat !!
Topic: First Post and Personal Achievement
Replies: 5
Views: 54

Re: First Post and Personal Achievement

That's really quite a nice image Dan, welcome to the forum. What scope did you use?
by marktownley
Fri Dec 04, 2020 6:03 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New flats from DayStar Filters!
Replies: 2
Views: 35

Re: New flats from DayStar Filters!

Yes spotted these had appeared recently. We've been doing this for years here on solar chat using plastic bags. I wonder if when people complain about the unevenness of their quarks for imaging Daystar will tell them they need one of these...
by marktownley
Fri Dec 04, 2020 6:42 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solar image size affected by focal extenders/reducers
Replies: 4
Views: 60

Re: Solar image size affected by focal extenders/reducers

You can use the fov calculator here https://astronomy.tools/calculators/field_of_view/ to get an idea of what you'll get. I use a 50mm etalon on the front of a 60mm f6 scope, followed by a Quark and then the Baader 0.7x telecompressor which gives me a full disk on a PGR GH3 with a 3376 x 2704 pixel ...
by marktownley
Thu Dec 03, 2020 4:36 pm
Forum: This is SolarChat !!
Topic: Focus issue: ASI174MM PST pairing: redux
Replies: 7
Views: 81

Re: Focus issue: ASI174MM PST pairing: redux

You got any pictures you can show with the 174? Dont forget with this camera you are hugely undersampling and so will have a loss of resolution which may be what you are seeing?
by marktownley
Thu Dec 03, 2020 11:44 am
Forum: This is SolarChat !!
Topic: Focus issue: ASI174MM PST pairing: redux
Replies: 7
Views: 81

Re: Focus issue: ASI174MM PST pairing: redux

AndiesHandyHandies wrote:
Thu Dec 03, 2020 9:42 am
All the pictures of the inside of PSTs I have seen have the penta prism at a slight angle so seem to be made that way.
Indeed, but the glue is gloopy and this sag generally increases over time. After a certain point the sag introduces astigmatism which is what the issue could be here.
by marktownley
Thu Dec 03, 2020 6:41 am
Forum: This is SolarChat !!
Topic: AR 2786 surrounded by waves
Replies: 14
Views: 166

Re: AR 2786 surrounded by waves

That's very good indeed Alfred¬!
by marktownley
Thu Dec 03, 2020 6:41 am
Forum: SPoD Archive
Topic: AR 2786 surrounded by waves
Replies: 6
Views: 15

Re: AR 2786 surrounded by waves

That's very good indeed Alfred¬!
by marktownley
Thu Dec 03, 2020 6:39 am
Forum: This is SolarChat !!
Topic: Focus issue: ASI174MM PST pairing: redux
Replies: 7
Views: 81

Re: Focus issue: ASI174MM PST pairing: redux

You sure it's not the prism out of alignment in the PST? Sounds like it to me... The glue that holds it in place flows over time and the prism sags.
by marktownley
Wed Dec 02, 2020 9:13 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Coronado SolarMax III ?
Replies: 9
Views: 227

Re: Coronado SolarMax III ?

SJohnson wrote:
Wed Dec 02, 2020 9:01 pm
I struggle with it having a band across the center of the disk when using it double stacked
This is because you have too much tilt on the etalon. Nice pic btw.
by marktownley
Wed Dec 02, 2020 7:59 pm
Forum: This is SolarChat !!
Topic: Ha and Ca II K 2nd December 2020
Replies: 14
Views: 111

Re: Ha and Ca II K 2nd December 2020

Really nice shots Stu, glad you got some sun!
by marktownley
Tue Dec 01, 2020 8:43 pm
Forum: This is SolarChat !!
Topic: November 28
Replies: 14
Views: 138

Re: November 28

Very good images Paul!
by marktownley
Tue Dec 01, 2020 8:40 pm
Forum: This is SolarChat !!
Topic: Visual Report 01/12/2020
Replies: 3
Views: 43

Re: Visual Report 01/12/2020

Sounds a positive session Andrew
by marktownley
Tue Dec 01, 2020 8:34 pm
Forum: Solar Scope Modifications
Topic: G band instead of Ca-k filter
Replies: 45
Views: 447

Re: G band instead of Ca-k filter

Keep in mind what Christian pointed out, you need a big aperture and his seeing was sustained 0.7~0.8 arc-seconds, and as good as 0.3 arc-seconds. This isn't anyone's backyard seeing. This was at a specific location with exceptional seeing conditions. Professional observatory location class. G-band...
by marktownley
Tue Dec 01, 2020 6:15 pm
Forum: This is SolarChat !!
Topic: AR 2786 on Nov 27 with the TOA 150 and double stack
Replies: 13
Views: 169

Re: AR 2786 on Nov 27 with the TOA 150 and double stack

Excellent images Christian. The difference between single and double stack is both subtle and dramatic at the same time. How do you find it affects exposure time between the two methods?
by marktownley
Tue Dec 01, 2020 6:10 pm
Forum: This is SolarChat !!
Topic: AR2786 WL 1st December 2020
Replies: 17
Views: 141

Re: AR2786 WL 1st December 2020

Good shot Stu!
by marktownley
Tue Dec 01, 2020 6:08 pm
Forum: This is SolarChat !!
Topic: AR2786 | HA, CaK | Discs | Dec 1rst 2020
Replies: 14
Views: 111

Re: AR2786 | HA, CaK | Discs | Dec 1rst 2020

A very good set of images indeed Marty. You would have got away with the 8" for Ha first thing looking at the seeing chart. Long may your good seeing prevail!
by marktownley
Tue Dec 01, 2020 2:06 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SolarMax III Etalon question
Replies: 5
Views: 83

Re: SolarMax III Etalon question

Hi there and welcome to the forum. I would suggest you are unable to get the external etalon to tune as it is the 'double stack' etalon, it is designed to be used for this only. If you want to use an etalon on another scope you need to use the inner (or primary) etalon as this is the one designed to...
by marktownley
Mon Nov 30, 2020 4:47 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Radio Detected Leonids November 2020
Replies: 25
Views: 287

Re: Radio Detected Leonids November 2020

Impressive data chaps! Welcome to Les also :)
by marktownley
Mon Nov 30, 2020 4:44 pm
Forum: Forum Support Issues
Topic: Test Message, thx Montana
Replies: 9
Views: 132

Re: Test Message

Thx Montana, Met Mark and Stephen as a Panelist on AstroRadio.Earth a couple of weeks ago, just getting into Solar but after hearing about how Mark got into solar observing I get it. I am a Slooh.com remote imaging user and Ambassador, and a member of the Milwaukee Astronomical Society; http://milw...
by marktownley
Mon Nov 30, 2020 4:30 pm
Forum: This is SolarChat !!
Topic: November 29, 2020 ARs and prom + SS vs. DS comparison
Replies: 23
Views: 220

Re: November 29, 2020 ARs and prom

Incredibly impressive images Phil
by marktownley
Mon Nov 30, 2020 4:27 pm
Forum: This is SolarChat !!
Topic: Solarsphere Event Saturday 19th December
Replies: 8
Views: 194

Re: Solarsphere Event Saturday 19th December

Hot off the press, the running order as follows: Solarsphere Day 19th December 2020 ( FREE ON-LINE EVENT ) 11am – 12:50 pm JD Quenzer - Solarsphere Music Show ( Radio Event ) Zoom and YouTube 1pm – Introduction 1:10pm Emma Wride AstroCymru with Space Crafts & Projects for Children 2pm – 2:30pm – Fun...
by marktownley
Mon Nov 30, 2020 4:16 pm
Forum: This is SolarChat !!
Topic: 30th Nov
Replies: 11
Views: 137

Re: 30th Nov

That's a good disk Robert. It's all goin' on darn sarf'...
by marktownley
Mon Nov 30, 2020 4:14 pm
Forum: This is SolarChat !!
Topic: Solarsphere Event Saturday 19th December
Replies: 8
Views: 194

Re: Solarsphere Event Saturday 18th December

MapleRidge wrote:
Sun Nov 29, 2020 9:42 pm
Sounds good Mark...thanks for the heads up!

Just want to check if it isn't the 19th...that is the Saturday?

Brian
Sorry, yes, good spot, it's the saturday...