Search found 161 matches

by george9
Sat Aug 01, 2020 1:36 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1032

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: 1032

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: 1032

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: 1032

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: 1032

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: 1032

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: 1032

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...
by george9
Mon Jul 20, 2020 1:42 am
Forum: This is SolarChat !!
Topic: July 18th - Looks Quiet
Replies: 11
Views: 390

Re: July 18th - Looks Quiet

Glad you caught that image. I was studying the Sun in my LS80 DSII and then my C11 RG32. Those two proms at 4 o'clock were fun, and the one at 9 o'clock was like a thin thread. The filament below the 9 o'clock prom was the biggest, and the two proms at 3 o'clock had their own filament right undernea...
by george9
Sun Jul 19, 2020 3:16 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solarscope SF70DS incoming
Replies: 65
Views: 3344

Re: Solarscope SF70DS incoming

Yes, the "AS-1 90" was a single stack front-mounted filter that threaded onto the front of a Televue 101 refractor. Similar design to the current Meade front-mounted filters. It evolved to the SolarMax. I had its little brother, the ASP-60 (P stood for Televue Pronto, which it screwed into). Bob Y. ...
by george9
Fri Jul 17, 2020 5:40 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Solarscope SF70DS incoming
Replies: 65
Views: 3344

Re: Solarscope SF70DS incoming

If I remember correctly, the Coronado AS1-90 was around $5500 in 2000, or $11,000 double stacked. I don't remember if that came with the blocking filter. The 60mm ASP-60 was $2650, and the 140mm filter was around $13,000.

George
by george9
Sat Jul 11, 2020 11:25 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Polarizing filters : safe or not for solar observation
Replies: 5
Views: 485

Re: Polarizing filters : safe or not for solar observation

And thanks for the filter page. The Astrodon UV filter looks great. And not that much more expensive than filters with only 65% transmission.

George
by george9
Sat Jul 11, 2020 11:20 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Polarizing filters : safe or not for solar observation
Replies: 5
Views: 485

Re: Polarizing filters : safe or not for solar observation

I think it is good that you have reminded people that polarizers are for viewing comfort and optimization, NOT eye safety. The rule of thumb is that the system should already be blocking sufficient UV and IR before you approach it with a polarizer. Once you know 200-400 and 700-3000 are safe, what i...
by george9
Fri Jul 10, 2020 3:57 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 44
Views: 2298

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

I wonder if my L-2c is a previous generation before the L-1, L-2, L-3 series. For example, I see no "c" mentioned anywhere any more. I got it about six year ago. It actually says:

L filter
UV IR cut
Type 2c

George
by george9
Thu Jul 09, 2020 8:56 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 44
Views: 2298

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

I did better measurements today, and I added tilting. Titling 3 degrees did little. But at 25-30 degrees, many of the filters passed a lot more light. At 30 degrees, I assume the image is degraded. This is all measured with a Lunt CaK B1200 and PST #1 yellow filter double stack on an ASI290, assumin...
by george9
Thu Jul 09, 2020 12:20 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 44
Views: 2298

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

I stand corrected. I had a little time before sunset when the clouds cleared. In CaK: Baader blue-CCD - passed 33% Astronomik UV-IR cut L-2c - passed 50% Baader double stack K-line 8nm - passed 66%+ I didn't measure it, but my PST #1 yellow filter passes the least light, but that boosts contrast, so...
by george9
Wed Jul 08, 2020 6:09 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Can I have an 2020 update on where we are with Ca-K filter controls.
Replies: 44
Views: 2298

Re: Can I have an 2020 update on where we are with Ca-K filter controls.

The other half of the equation, if you are using a Lunt CaK, is what it the transmission of its ERF? Depending on that profile, there may not be much to gain by adding another ERF in front. If the Lunt is already narrow and sharp, then adding another filter with high transmission in front of it ends...
by george9
Sun Jul 05, 2020 9:15 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1032

Re: Baader Coronagraph

For the record, nope, not 530. More like 547nm. I looked at a reflection of the Sun off the floor in the spectroscope and logged the bands, and 530 was lower than the coronagraph line. I cannot find anything of interest at 547, so I suspect it is a degraded filter. A very narrow line though.

George
by george9
Sun Jul 05, 2020 3:57 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1032

Re: Baader Coronagraph

Or maybe that extra green band is 530nm for FeXIV in the hope to get that bright but low coronal emission over an active region (I just learned about it, so I may have it wrong)? I measured 540nm in my hand spectroscope, but it is not very accurate.

George
by george9
Sun Jul 05, 2020 1:17 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1032

Re: Baader Coronagraph

Thanks, Alexandra. I agree. My general rule is I don't view unless I have a complete commercial visual filter in series with whatever I come up with. The Prom15T will be for imaging only and sounds like so will be the original H-alpha filter. I guess I could try to find a commercial 2A prom filter t...
by george9
Sat Jul 04, 2020 3:05 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader Coronagraph
Replies: 18
Views: 1032

Baader Coronagraph

I acquired a Baader Coronagraph for fun, plus a matching Celestron (Vixen) 80mm refractor. The H-alpha filter is deteriorating, and the price reflected that. Normally when a filter deteriorates it gets darker, not lighter, so it is probably safe. But I was thinking of putting a Beloptic UV-IR KG3 cu...
by george9
Fri Jun 05, 2020 2:51 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: My smallest spectroscope first light
Replies: 6
Views: 437

Re: My smallest spectroscope first light

That's great. What approximate bandwidth are you achieving on each image, do you think? George
by george9
Thu Jun 04, 2020 4:03 pm
Forum: This is SolarChat !!
Topic: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31
Replies: 27
Views: 718

Re: Fun with Ca K filters. First light of Alluxa Ca K filter, May 31

Excellent!

Is the Barr filter single cavity or multiple cavity? I wouldn't have thought the Alluxa would have made such a big difference in the two images (Barr versus Barr+Alluxa). But it must be multiple cavity or the Barr solo image wouldn't have looked so good.

George
by george9
Sun May 24, 2020 11:54 pm
Forum: This is SolarChat !!
Topic: Lunt Pressure Tuner
Replies: 13
Views: 371

Re: Lunt Pressure Tuner

Lunt uses Dow Corning High Vacuum Grease. They send some grease with new O-ring sets. I had cleaned the grease on one of my pressure tuners. Then I noticed it developed some hysteresis when tuning up and down. So I loaded more grease on the PT threads and it went back to normal. So some of the extra...
by george9
Sun May 17, 2020 12:32 am
Forum: This is SolarChat !!
Topic: 15May - C11 CAK Hi-Res Imaging - New images added on 20 May
Replies: 28
Views: 857

Re: 15May - C11 CAK Hi-Res Imaging - New image added and raw image for processing

Alfred, spectacular job in all cases. Visually, I prefer the first to the second even if it is less sharp because the second does not look real. When you blow it up, you see the entire image is made of dots and tubes that are all identical width, I guess based on the sharpening software because the ...
by george9
Tue Apr 14, 2020 10:50 am
Forum: This is SolarChat !!
Topic: Forum upgrades finally completed. sort of
Replies: 17
Views: 3376

Re: Forum upgrades finally completed. sort of

This is a unique resource. Thank you.

George