Search found 95 matches

by george9
Tue Dec 18, 2018 5:20 pm
Forum: Solar Scope Modifications
Topic: Best current set up
Replies: 7
Views: 913

Re: Best current set up

Thanks. So obviously I am new to this part. Hard for me to judge noise. On pixel size, I guess the 174 makes more sense for H-alpha, where you are likely at f/30 (say with a Quark). For CaK, where you are f/7, the 290 pixels are likely to make more sense. And the 1600 has intermediate pixels, low no...
by george9
Mon Dec 17, 2018 11:04 pm
Forum: Solar Scope Modifications
Topic: Best current set up
Replies: 7
Views: 913

Re: Best current set up

Ok thanks. I will check. George
by george9
Sun Dec 16, 2018 4:11 pm
Forum: Solar Scope Modifications
Topic: Best current set up
Replies: 7
Views: 913

Re: Best current set up

Thanks, Valery. Agreed. I was thinking of starting with an ASI 174MM mono as an efficient next step, which should cover the large refractor well enough. Then can decide what to move on to.

George
by george9
Sun Dec 16, 2018 5:03 am
Forum: Solar Scope Modifications
Topic: Best current set up
Replies: 7
Views: 913

Best current set up

I am wondering what people might consider to be their best current solar set up of all the configurations they have tried. I think there is a lot of useful information inherent in the collective experience. I mean, all the things we have tried are good, but after all the tweaking and tinkering what ...
by george9
Tue Nov 13, 2018 12:41 am
Forum: Solar Scope Modifications
Topic: Lunt CaK B1200 + PST #1 yellow
Replies: 6
Views: 1025

Re: Lunt CaK B1200 + PST #1 yellow

Thanks, Bob. Yes, you have a similar effect. George
by george9
Sun Nov 11, 2018 9:37 pm
Forum: Solar Scope Modifications
Topic: Lunt CaK B1200 + PST #1 yellow
Replies: 6
Views: 1025

Re: Lunt CaK B1200 + PST #1 yellow

Some follow up. I finally got a decent chance to compare my Lunt B1200 CaK, the Lunt with the PST yellow filter, and the Lunt with a neutral density Moon filter (just to ensure any improvements weren't due to dimming the image to a better place in the imager's range). First image is Lunt alone, then...
by george9
Sun Nov 11, 2018 8:56 pm
Forum: This is SolarChat !!
Topic: Mg II in UltraViolet
Replies: 31
Views: 2785

Re: Mg II in UltraViolet

They also have a 12" classic Cassegrain from Orion Optics UK, although it costs four times as much. 25% obstruction (vs 33% on the smaller ones). Comes with a Ronchi test, but no mention of minimum performance. George
by george9
Wed Oct 31, 2018 4:16 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 44
Views: 4092

Re: Experimenting calcium imaging with small refractors

Thanks, all. I know that stopped down to 67% (4 inches), the AP155 looks very nice in my coarse R2 video camera. Thinking of getting a better camera in the spring.

George
by george9
Mon Oct 29, 2018 2:06 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 44
Views: 4092

Re: Experimenting calcium imaging with small refractors

I am curious to hear how the AP130 EDT works out because it has implications for my AP155 EDF. Bob, you have the f/8 I take it and not the f/8.3. The f/8.3 is the same lens as the AP155 but stopped down to 130. But even the f/8 is somewhat similar.

George
by george9
Mon Oct 29, 2018 2:06 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: LS60 upgrade options
Replies: 12
Views: 1535

Re: LS60 upgrade options

Dan, I think for the price, the LS80SS won't feel better enough than your LS60SS. For that matter, neither will the SolarMax SS, in my opinion. In part because the LS60 is a really nice scope. FYI, for a day in and day out portable solar scope, I have yet to beat the LS80 DSII (but with a brighter b...
by george9
Sat Oct 27, 2018 2:43 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: LS60 upgrade options
Replies: 12
Views: 1535

Re: LS60 upgrade options

I have the LS80DSII and the Quark. I use the LS80 most of the time. Nice views, pretty portable, great full disk and proms. On the other hand, it will be the least different from what you have now. And mine is DS, which really adds to the disk view in my opinion. The Solarmax is pretty heavy. Betwee...
by george9
Sun Oct 14, 2018 2:06 am
Forum: Solar Scope Modifications
Topic: PST CaK mod
Replies: 12
Views: 3260

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: 18
Views: 1555

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: 6
Views: 1025

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: 6
Views: 1025

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: 8
Views: 1254

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: 9
Views: 931

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: 16
Views: 1752

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: 72
Views: 9498

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: 72
Views: 9498

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: 72
Views: 9498

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: 4121

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: 1109

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: 1623

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: 1623

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...