Search found 179 matches

by george9
Mon May 10, 2021 5:40 pm
Forum: This is SolarChat !!
Topic: Corona and other things
Replies: 9
Views: 147

Re: Corona and other things

Awesome job!

George
by george9
Fri Apr 30, 2021 12:37 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SolarSpectrum?
Replies: 29
Views: 714

Re: SolarSpectrum?

I agree whatever Solar Spectrum you can afford. The smaller ones are all research grade in evenness; for the larger ones you have to make a choice. If you are only doing high-res imaging, then yes you can get by with a smaller one. I picked the 32mm to maximize the view through my 30mm binoviewer. T...
by george9
Thu Apr 15, 2021 7:59 pm
Forum: Solar Scope Modifications
Topic: Getting more light through my Rumak180 safely
Replies: 13
Views: 336

Re: Getting more light through my Rumak180 safely

For naked eye eclipse viewing, you don't need to worry about long IR, but in a telescope I worry that the long IR could be amplified, and so yes I keep it safe. The CaF2 you reference I think blocks 10,000nm and up, so very long IR and not useful. You need 1000-3000nm. I use the KG3 and yes I give u...
by george9
Wed Apr 14, 2021 6:51 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solar Spectrum advice, tips, do's and don'ts
Replies: 2
Views: 157

Re: Solar Spectrum advice, tips, do's and don'ts

I don't find it useful to stop down my 6" f/7 for my RG32 0.3A Solar Spectrum, and I am not in a super seeing location. Either the seeing is there or not, and stopping down doesn't fix it for me. I use a Baader DERF. I don't use a sub-aperture ERF, and Mark W generally recommends against the du...
by george9
Tue Mar 30, 2021 1:48 am
Forum: This is SolarChat !!
Topic: Images from new Solar Spectrum .3A
Replies: 10
Views: 162

Re: Images for new Solar Spectrum .3A

Bob's advice is great. One comment though. The 0.3A filters I have looked through all still have an obvious double limb, even at f/40. So don't necessarily expect it to disappear. A really good 0.2A filter I looked through still had it, too, but there I would say it really looked less obvious on tha...
by george9
Fri Mar 19, 2021 12:57 am
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1317

Re: CaK disc comparison between SS and DS

Merlin66, why not skip the Baader Blue CCD and gain transmission? I think mine is about 30%. If you tilt it enough, it comes on band, but it may be so much that it distorts the view.

George
by george9
Thu Mar 18, 2021 7:03 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1317

Re: CaK disc comparison between SS and DS

I notice a Coronado 70mm CaK just sold on AM. It was "missing part of the rear blocking filter." I wonder if that was that the narrowband filter, in which case it was less useful.

George
by george9
Wed Mar 17, 2021 1:49 am
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1317

Re: CaK disc comparison between SS and DS

Just to point out that an f/30 refractor is better than f/7.5, but neither is as good as an f/7.5 with a TZ4 telecentric element (see Christian's web site). So it is not just getting to the specified f/ratio, but how you get there. On Bob's comment, I do use a collimator followed by a telecentric fo...
by george9
Sun Feb 21, 2021 11:40 am
Forum: This is SolarChat !!
Topic: LUNT 300mm Ha SolarScope - Question ??
Replies: 26
Views: 429

Re: LUNT 300mm Ha SolarScope - Question ??

Sorry, I meant I have a 280mm SCT, but I would love to look through a Lunt 300mm H-alpha refractor.

George
by george9
Sun Feb 21, 2021 1:00 am
Forum: This is SolarChat !!
Topic: LUNT 300mm Ha SolarScope - Question ??
Replies: 26
Views: 429

Re: LUNT 300mm Ha SolarScope - Question ??

I think it is neat that they created it. I was so looking forward to looking through it at last year's NEAF or this year's NEAF, but COVID intervened. I already own a 280mm H-alpha scope, on which I use a 0.3A filter double stacked with another etalon. But this would give a really nice refractor vie...
by george9
Thu Feb 18, 2021 1:00 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New "built in" double stacked Lunt 80, anyone?
Replies: 18
Views: 1301

Re: New "built in" double stacked Lunt 80, anyone?

On the HRG filter, if you have two etalons next to each other, there is usually a reflection. If they are internal, then you cannot tilt one enough to throw them out of the field of view. The amount of glow varies, but generally there is something. Lunt's HRG filter is convenient and gets you 80 or ...
by george9
Mon Feb 15, 2021 10:30 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New "built in" double stacked Lunt 80, anyone?
Replies: 18
Views: 1301

Re: New "built in" double stacked Lunt 80, anyone?

As Bob noted, I have an LS80 DSII. The sweet spot is just a little bigger than the Sun, so it works fine; but I do tend to center proms if I want to look closely. It had a glow, which I eliminated by (1) installing a Kaesemann High Transmission Circular Polarizer between the two etalons, (2) replaci...
by george9
Fri Jan 08, 2021 9:08 pm
Forum: This is SolarChat !!
Topic: PowerMate or Barlow for H-Alpha Video
Replies: 7
Views: 246

Re: PowerMate or Barlow for H-Alpha Video

For the Quark, its 4.2x already magnifies. But you also mention DSO, lunar, and white light, and there presumably a magnifier might help, no?

I assume a simple Barlow would be fine. The Powermate most is useful if either an eyepiece follows (visual) or if a narrowband filter follows.

George
by george9
Tue Dec 15, 2020 12:29 pm
Forum: This is SolarChat !!
Topic: Total Solar eclipse today!
Replies: 27
Views: 731

Re: Total Solar eclipse today!

DeepSolar64's eclipse capture shows the color effect. The large prom on the right (see the snippet below) is the appropriate pink, but look at the furthest part of the prom. That looks more orange to me than the rest. Screen Shot 2020-12-15 at 7.16.10 AM.png The H-alpha matches. The shot included by...
by george9
Mon Dec 14, 2020 9:39 pm
Forum: This is SolarChat !!
Topic: Total Solar eclipse today!
Replies: 27
Views: 731

Re: Total Solar eclipse today!

I noticed in the 2017 eclipse that part of the biggest prominence seemed a little more orange-ish than the rest, which was the typical neon pink. I thought perhaps it was a little brighter than the rest, so it was just an illusion. Looking at today's eclipse (e.g., 27m 4s): https://www.youtube.com/w...
by george9
Wed Dec 02, 2020 3:01 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Advice requested on Quantum filter purchase
Replies: 60
Views: 2930

Re: Advice requested on Quantum filter purchase

I like my Solar Spectrum RG32 0.3A. Very even, very bright. Perhaps a little wide, but I usually double stack it anyway. The temperature regulation works well.

George
by george9
Wed Dec 02, 2020 2:56 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Coronagraph
Replies: 9
Views: 542

Re: Coronagraph

The original Baader coronagraph with its occulting cone used a 10A H-alpha filter and worked well. Without an occulting cone, 10A is too wide, and I suspect 5A is, too. Most prominence filters I know of use 2A. I don't find that prominences look better in my 2A filter than in my 0.5A double stack or...
by george9
Sat Aug 01, 2020 1:36 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Thanks. I ended up using the smaller cone from the 1040mm series. It's like being at a 7-minute eclipse instead of a 30-second eclipse. My camera has a narrow field, so I can always inch that limb to the edge.

George
by george9
Sat Aug 01, 2020 2:44 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Here are a few first-light shots through the coronagraph on an 80mm. My imaging skills are limited, and these are single, raw images. Zero processing. I could work on focus, narrowing the iris, etc. And I was looking through very thin clouds. But given the tiny proms, this was pretty good. Screen Sh...
by george9
Fri Jul 24, 2020 2:51 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Some more information: The black disk on the lens that is shown in my photo is 9.4mm. The cones that came with my set range from 8.4mm for 910mm f.l. in July to 8.8mm for 910mm in January to 9.9mm for 1040mm f.l. in January. If the cone is over 9.4mm, then you are set. For smaller cones, there are t...
by george9
Thu Jul 23, 2020 7:24 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Thanks for the photos. No need to pull it out. The important thing is that I don't see a big black disk behind it. Mine looks like an integral part of the system, so I don't think someone just stuck it there. It is what the stalk is attached to. I'll do some more testing. Maybe measure it with a cal...
by george9
Thu Jul 23, 2020 2:50 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Thanks, Alexandra. I did look at the blog. I cannot tell from your photo, but here is mine. There is the silver cone at top. It sits on a stalk. The cone actually moves into and out of the lens, as described in my copy of the Baader manual. (And if you pull the cone too far out, you start to see a r...
by george9
Thu Jul 23, 2020 2:12 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Alexandra or others with experience, I am having trouble focusing the cone on the camera. It seems that the mount on the lens that the cone is attached to is larger than the cones themselves, so I am not sure I can get around it to see the cone. That is, there are a series of cones that screw onto a...
by george9
Thu Jul 23, 2020 1:59 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1598

Re: Baader Coronagraph

Thanks, Mark. I had missed this. That's actually the whole filter assembly. I suspect the degradation has let some green through. I have not yet actually proven that the red line is still in H-alpha, but that should be easier to check. I may just try to use my Prom15T, adding an RG630 and KG3, using...