13 May with Omega Ha

this is the main message area for anything solar :)
Post Reply
RodAstro
Ohhhhhh My!
Ohhhhhh My!
Posts: 54
Joined: Sun Oct 29, 2017 9:51 pm

13 May with Omega Ha

Post by RodAstro » Tue May 14, 2019 3:34 pm

Hi just a crude mosaic with the Omega Ha filters from yesterday
sadly the QHY5 is hit and miss with vertical lines but I will stick with it until I get a better filter system
Attachments
Mosaic 13-5-19 16-50pm.jpg
Mosaic 13-5-19 16-50pm.jpg (640.37 KiB) Viewed 340 times

User avatar
marktownley
Librarian
Librarian
Posts: 25983
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: 13 May with Omega Ha

Post by marktownley » Tue May 14, 2019 6:46 pm

Good result for the Bob filters! a PST mod would be the next stage up.
Image
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!

User avatar
MalVeauX
Almost There...
Almost There...
Posts: 874
Joined: Tue May 09, 2017 7:58 pm
Location: Florida

Re: 13 May with Omega Ha

Post by MalVeauX » Tue May 14, 2019 6:50 pm

Hrm,

I'm genuinely curious the bandwidth of that filter(s). If it's around 1A it could be a very interesting option as the 2nd filter after an etalon....

Very best,

RodAstro
Ohhhhhh My!
Ohhhhhh My!
Posts: 54
Joined: Sun Oct 29, 2017 9:51 pm

Re: 13 May with Omega Ha

Post by RodAstro » Tue May 14, 2019 11:03 pm

Thanks Mark
I will have to work on my processing but it is coming along.
You are quite right I am going to try a PST mod next, I have been working on one with Andrew on a vixen 110mm so will transfer that to the Zeiss the only problem will be the small sweet spot tof the PST etalon at 2250 focal length.
If that doesn't work I will probably go for a Quark combo as starting with a f15 scope the combo should be ok.
If anyone has a combo and fancy a day trying it on my very special Zeiss scope, one only three I know of working in the west, they are quite welcome.

You are quite right Marty we are going to try the filters after the PST etalon instead of the 5mm blocker, in theory they should work as they are narrow enough for the comb filter and two may work as a double stack. Not as narrow as two etalons but may improve the contrast a bit and have a much bigger output the same as a quark. The only thing is they will have to be tilted to bring them on band and this may cause banding, although a flat should remove that.
I will give an update on this experiment.

User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3280
Joined: Sun Nov 18, 2012 3:13 pm

Re: 13 May with Omega Ha

Post by Valery » Wed May 15, 2019 3:13 am

RodAstro wrote:
Tue May 14, 2019 11:03 pm
The only thing is they will have to be tilted to bring them on band and this may cause banding, although a flat should remove that.
Pretty much useless flat field in this given case. The problem is not in a different brightness (like vignetting) but also that at brighter area your filter is already out of H-a and even if you will equalize the brightness, you will not help to get back the H-a details contrast loss.


The best way I see for your scope (if to save money) is TV PowerMate 2,5x and Quark combo this will yields final F/37.5 . Or use a weak focal reducer made of small achromatic lens (with 0,67x power) and then use a standard Quark Chromosphere which yields final F/43.

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.

RodAstro
Ohhhhhh My!
Ohhhhhh My!
Posts: 54
Joined: Sun Oct 29, 2017 9:51 pm

Re: 13 May with Omega Ha

Post by RodAstro » Wed May 15, 2019 7:51 am

Hi Valery
I get your point
My biggest problem is seeing though and I think at f40 I will be pushing it.
Science building the observatory UK planning laws have relaxed, I did have a lovely clear horizon to the west but now I have a house to the west almost on top of me so limited to 30 degrees above the horizon in the summer over a house that has been heated all day, that is my best seeing.
I really need to see what a Quark Combo can do around f15 or with the scope stopped down.
A PST etalon may also be a problem as I think it may have to go inside the scope because there is no way to shorten the tube.
Not defeated yet though as what I have learnt from the Omega filters is what in theory is optimum is not always best when you have other parameters involved.

User avatar
Montana
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 20705
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK

Re: 13 May with Omega Ha

Post by Montana » Wed May 15, 2019 11:23 am

That's a lovely panorama Rod :bow

Sorry to hear about the house, I bet you bought your house because of that astro view and some selfish person ruined it. I have exactly the same with 100 houses now on my lovely view which used to be 1st grade agricultural land and grow wheat. It is amazing how in the UK it is impossible to build houses on brown field sites but planning permission is grated first time on food producing land. I guess we don't need food now or in the future.

Alexandra

RodAstro
Ohhhhhh My!
Ohhhhhh My!
Posts: 54
Joined: Sun Oct 29, 2017 9:51 pm

Re: 13 May with Omega Ha

Post by RodAstro » Wed May 15, 2019 3:41 pm

Thanks Alexandra for the positive comments.

Your quite right about the house building in the UK. The reason we moved here was to get away from the light pollution. the interesting thing is on the plans for four houses the builders put in garages across the access to the fields behind and then they never built the garages so we expect a new housing estate will come next, all green belt. A hundred yards down the road is useless land for farming reclaimed from the old coal pits, no one wants to build there.
Sad for my lovely telescope. It seems the englishman's home is not his castel any more.

Post Reply

Who is online

Users browsing this forum: No registered users and 6 guests