Search found 34 matches

by george9
Sun Oct 14, 2018 2:06 am
Forum: Solar Scope Modifications
Topic: PST CaK mod
Replies: 28
Views: 1979

Re: PST CaK mod

I made cardboard rings to hold the PST elements within the larger 1.25 inch cells. I actually exploited that to make a very compact tilt mechanism: I basically push the cardboard along the threads on one side compared to the other. It was meant as a prototype, but I haven't felt the need to upgrade ...
by george9
Thu Oct 04, 2018 1:43 am
Forum: This is SolarChat !!
Topic: Lunt calcium filter imaging thread
Replies: 28
Views: 580

Re: Lunt calcium filter imaging thread

Nice. Makes me look forward to the next maximum, assuming we have one. George
by george9
Mon Oct 01, 2018 9:19 pm
Forum: Solar Scope Modifications
Topic: Lunt CaK B1200 + PST #1 yellow
Replies: 3
Views: 120

Re: Lunt CaK B1200 + PST #1 yellow

Yes, the first filter after the objective lens. It is thin and yellow and 25mm in diameter. The one after it is mirror-like. Then the black box.

(In case it's not obvious, the image with the 18 above is the one with the yellow filter. And thanks for the advice, Apollo.)

George
by george9
Mon Oct 01, 2018 12:02 am
Forum: Solar Scope Modifications
Topic: Lunt CaK B1200 + PST #1 yellow
Replies: 3
Views: 120

Lunt CaK B1200 + PST #1 yellow

I was experimenting with a PST #1 yellow filter with my Lunt B1200 CaK. I was testing on a 70mm F/6.8 doublet. I only have an R2 Revolution imager, so no reasonable photos to show. I will try to attach iPhone shots of the R2 monitor. Lunt with the yellow filter vs. Lunt without: 1. Gain had to be in...
by george9
Sat Sep 22, 2018 12:27 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 10
Views: 440

Re: What do you think is the most versatile high resolution solar telescope design?

I notice that Baader does not use the Edge version of the Celestron. Whereas AiryLabs does. And of course, with a front-mounted ERF, you can do what you want. Anyone notice a difference in performance? Especially at 393nm?

George
by george9
Tue Sep 18, 2018 5:52 pm
Forum: This is SolarChat !!
Topic: Why is the PST etalon not sold on its own?
Replies: 13
Views: 379

Re: Why is the PST etalon not sold on its own?

I agree completely. I see a lot of swapping of blocking filters that gets me nervous. Fine for imaging but not visual. The only safe way for me to brighten a blocking filter is to ask the original manufacturer to do it (sometimes they can). And even then, I checked it with a spectrometer. In all my ...
by george9
Sun Sep 16, 2018 11:43 am
Forum: Solar Reference Library
Topic: Surface contrast in CaK for various filter bandpasses.
Replies: 19
Views: 578

Re: Surface contrast in CaK for various filter bandpasses.

This is really excellent, Peter. Thanks so much. Another approach is to compare your CaK sweep to your H-alpha sweep. The filament at top seems to be visible in a range that is at best 2 times narrower than H-alpha but not quite 3 times narrower. So maybe 2-2.5 times narrower. You can see filaments ...
by george9
Thu Aug 30, 2018 7:26 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 5380

Re: Different Ca-K options, differences?

Right, Valery. Thanks. I was very impressed with the realtime image that a NEAF attendee created with his small refractor, Lunt CAK B1200, and ASI174 camera. Not sure what software he was using. Seems like in theory the pixels would be too big for a short-focal-length refractor and I don't remember ...
by george9
Sat Aug 25, 2018 3:23 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 5380

Re: Different Ca-K options, differences?

I agree on imaging. I actually got the CaH to test my ability to actually see it. That will have to await a cataract operation. So I switched to the Lunt CaK for quicker startup and hope that the 2A bandpass would be better. For now I have an R2 video, but will eventually get an ASI of some sort. Mo...
by george9
Fri Aug 24, 2018 3:53 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Different Ca-K options, differences?
Replies: 57
Views: 5380

Re: Different Ca-K options, differences?

Why is the Lunt CaK stated as only for refractors and the Quark for both reflectors and refractors? I had the Quark CaH and I could tell there was a lot of out-of-band light. My eye could see a bright blue sun with no CaH detail (old eyes). My Lunt CaK produces a very dim purple image, also with no ...
by george9
Sat May 27, 2017 3:29 am
Forum: Solar Scope Modifications
Topic: Removing barlow from Quark
Replies: 17
Views: 2300

Re: Removing barlow from Quark

One question is how much of the blocking filter comes off with the Barlow. If I were Daystar, I would have put the blocking filter before (objective side of) the Barlow so that I could use a smaller one, which would mean it should unscrew with the Barlow.

George
by george9
Thu Jan 05, 2017 3:08 am
Forum: This is SolarChat !!
Topic: Sunrise and the Flash
Replies: 12
Views: 854

Re: Sunrise and the Flash

What a great shot! I thought I saw the flash today, first time in years. The sky was unusually clear with a yellow rather than red sun going down. I got distracted and when I looked up, I just saw a small green horizontal line (much like the photo) that disappeared in a second or so. I wonder if not...
by george9
Sun Dec 18, 2016 4:02 am
Forum: This is SolarChat !!
Topic: Collimating the LS152T
Replies: 13
Views: 1293

Re: Collimating the LS152T

Have you given Lunt a call? If needed, can you ship the scope to them? I expect if the sweet spot is that far off, they will do something to fix it.

For example, I had an odd Newtons' rings effect after the first year with my scope, and they just swapped the BF1800 for me to fix it.

George
by george9
Fri Dec 16, 2016 6:21 pm
Forum: This is SolarChat !!
Topic: Collimating the LS152T
Replies: 13
Views: 1293

Re: Collimating the LS152T

I would think that collimation the objective lens is unlikely to affect the sweet spot much. If the center is high contrast with all the H-alpha features visible, but it is very slightly blurry, and if off-center it is sharper, then that could be collimation. But if the center is off-band, then that...
by george9
Wed Oct 26, 2016 5:24 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Dream come true!
Replies: 113
Views: 17531

Re: Dream come true!

Great to hear, Bob. George
by george9
Fri Oct 21, 2016 1:03 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Original Coronado/ IOM 50mm etalon/ blocker
Replies: 4
Views: 639

Re: Original Coronado/ IOM 50mm etalon/ blocker

I know of several 2000-2005 Coronado filters that have de-contacted with any known fall or bump. That may be the case here. For mine, I hacksawed the case open (it was glued shut during that period), confirmed that the spacers hadn't fallen off (they were still stuck on one side), re-contacted it (l...
by george9
Fri Oct 14, 2016 8:06 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Dream come true!
Replies: 113
Views: 17531

Re: Dream come true!

Amazing, Bob! Good luck on the tuning. George
by george9
Wed Oct 12, 2016 12:27 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: LS100 DSll Circular polarizer adapter.
Replies: 12
Views: 2020

Re: LS100 DSll Circular polarizer adapter.

Just in case Gus doesn't see my post, let me warn readers that you can get different effects. My Denk II binoviewers and Kaesemann circular polarizer work fine when the filter is forward and have unbalanced illumination between the two eyepieces when it is backward. Others may see banding that is no...
by george9
Wed Oct 12, 2016 2:41 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: LS100 DSll Circular polarizer adapter.
Replies: 12
Views: 2020

Re: LS100 DSll Circular polarizer adapter.

Just to point out that circular polarizers are directional. There is a linear polarizer and then a quarter wave plate. If you put it in the direction that you would use it in a camera, then the output is circularly polarized and binoviewers will look fine. If you flip it (which could happen if you f...
by george9
Sun Oct 02, 2016 9:50 pm
Forum: Solar Scope Modifications
Topic: Double stack or refurbish my Daystar Quantum?
Replies: 7
Views: 1248

Re: Double stack or refurbish my Daystar Quantum?

I am not sure if I got lucky on the double stack or if there is something about my setup that produces a good result. Pairing an f/7 refractor with the Lunt DSII clearly makes sense because it's transfer lenses were designed for that. At the next solar star party, I will try other DSII units to see ...
by george9
Sat Oct 01, 2016 4:44 pm
Forum: Solar Scope Modifications
Topic: Double stack or refurbish my Daystar Quantum?
Replies: 7
Views: 1248

Re: Double stack or refurbish my Daystar Quantum?

I do not think you will see too much difference between 0.4A and 0.3A SS, at least not enough to warrant a large expense. Double stacking could have a large effect. There are not a lot of simple options. I use a Lunt DSII unit made for an LS80 in front of my Quark with a good effect. I have a 6inch ...
by george9
Tue Jul 12, 2016 11:05 am
Forum: This is SolarChat !!
Topic: Comparing 0.3A and 0.6 A bandpass in Ha
Replies: 27
Views: 1545

Re: Comparing 0.3A and 0.6 A bandpass in Ha

Yes, looking at those latter images, you may have convinced me about the 0.3A. I.e., that if you are going single stacked, then it is probably worth the money for the 0.3A. Certainly for imaging. For visual, I would have to compare 0.5A to 0.3A to make sure the 0.3A was not too dim visually. I know ...
by george9
Sat Jul 09, 2016 12:36 pm
Forum: This is SolarChat !!
Topic: Comparing 0.3A and 0.6 A bandpass in Ha
Replies: 27
Views: 1545

Re: Comparing 0.3A and 0.6 A bandpass in Ha

Very useful for someone choosing a filter, especially the first two images. For someone purely visual, given the difference in price, it is not clear that you get that much by halving the bandwidth. I was thinking 0.5A would about right, all things considered. The eye has a good dynamic range, so th...
by george9
Tue Jun 07, 2016 2:30 am
Forum: This is SolarChat !!
Topic: 1,6m telescope, adaptive optics, time lapse. BBSO
Replies: 13
Views: 741

Re: 1,6m telescope, adaptive optics, time lapse. BBSO

Thanks for this. It explains why a flare looks like countless tiny dots (instead of a ribbon) in a 6" refractor with a Quark when seeing is great. I guess they're not really dots but just what your eye interprets the flare texture as. And the linked image saturates the flare a bit; in your eye at hi...
by george9
Fri May 13, 2016 12:22 pm
Forum: Solar Scope Modifications
Topic: Quark DSII 155mm
Replies: 7
Views: 1553

Re: Quark DSII 155mm

I also tried a 2A prom filter (a tunable Prom15T from old Coronado) with my Quark. It clearly boosted contrast significantly. Not as much as a Lunt scope double stacked nor as much as the Lunt DSII paired with the Quark, but enough to make a difference. Didn't work so well when placed before the Qua...