Search found 24 matches

by george9
Sat May 27, 2017 3:29 am
Forum: Solar Scope Modifications
Topic: Removing barlow from Quark
Replies: 17
Views: 1676

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: 752

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: 1143

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: 1143

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: 15215

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: 505

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: 15215

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: 1684

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: 1684

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: 1073

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: 1073

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: 1281

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: 1281

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: 649

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: 1356

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...
by george9
Sun May 01, 2016 2:46 am
Forum: This is SolarChat !!
Topic: DSII observations and questions
Replies: 3
Views: 297

Re: DSII observations and questions

Try tilting the DSII with respect to the primary etalon. You can do it by using a small piece of paper as a shim before tightening the thumb screws or hex screws that hold the DSII on. It should move the glow around. When I center the glow, it becomes the dimmest. Others try to move it off the view,...
by george9
Thu Apr 21, 2016 3:00 am
Forum: Solar Scope Modifications
Topic: Can a good quark replace blocking filters?
Replies: 1
Views: 801

Re: Can a good quark replace blocking filters?

Others are more expert, but for me, I just turned the question around. The Quark is a self-contained H-alpha filter as long as you don't fry it. So if you have a scope with an ERF it should work fine with a Quark. The fact that you have another etalon in series in there too should be fine without th...
by george9
Sun Apr 17, 2016 2:34 am
Forum: Solar Scope Modifications
Topic: Quark DSII 155mm
Replies: 7
Views: 1356

Re: Quark DSII 155mm

Here is some follow up on the Quark DSII. When seeing is bad, it makes the biggest difference. The Quark by itself in poor seeing shows limited detail. With the DSII unit in series, the disk lights up in more detail despite the seeing. In good seeing, the Quark by itself shows lots of detail. The DS...
by george9
Fri Apr 01, 2016 4:29 pm
Forum: This is SolarChat !!
Topic: Fire and Ice during NEAF
Replies: 11
Views: 514

Re: Fire and Ice during NEAF

Extremely neat photos and links. I will be at NEAF, although not free at night. George
by george9
Mon Mar 28, 2016 3:03 pm
Forum: Solar Scope Modifications
Topic: Quark DSII 155mm
Replies: 7
Views: 1356

Re: Quark DSII 155mm

Here is a shot from the 4" focuser down. Looks like I forgot to mention that I left the Lunt 78mm-to-78mm spacer between the DSII and the adapter for the FeatherTouch; let me add that below. George Baader 160mm D-ERF and cell AP 155EDF f/7 with 4" focuser Precise Parts AP 4" to Lunt 78mm adapter (0....
by george9
Mon Mar 28, 2016 12:32 pm
Forum: Solar Scope Modifications
Topic: Quark DSII 155mm
Replies: 7
Views: 1356

Quark DSII 155mm

Reporting on my experience inserting a Lunt DSII into my Quark optical train: Baader 160mm D-ERF and cell AP 155EDF f/7 with 4" focuser Precise Parts AP 4" to Lunt 78mm adapter (0.25" thick) Lunt DSII intended for LS80 Lunt 78mm to Feathertouch adapter Feathertouch 2" focuser AP 2" extension (borrow...
by george9
Mon Mar 14, 2016 12:41 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt 60 SS/DS or Lunt 80 SS/DS?
Replies: 31
Views: 2944

Re: Lunt 60 SS/DS or Lunt 80 SS/DS?

What I have found is that the single most important factor is the variation between units of the same model and maker. So a good sample of model X is better than a bad sample of model Y no matter what the two cost. It is unsettling to know that you are taking a chance on any filter you buy, especial...
by george9
Mon Mar 14, 2016 3:54 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt 60 SS/DS or Lunt 80 SS/DS?
Replies: 31
Views: 2944

Re: Lunt 60 SS/DS or Lunt 80 SS/DS?

Hi Bill, Objective mounted (in front of objective) etalons have largest possible sweet spot. So, any 90mm and up refractor equipped with SM90 Coronado front mounted etalon will have significantly better uniformity of sun disk than Lunt 80THa with internally mounted etalon. Not say that 90mm apertur...
by george9
Thu Mar 10, 2016 3:04 pm
Forum: This is SolarChat !!
Topic: Big guns compared + additions
Replies: 25
Views: 877

Re: Big guns compared + additions

Hi, all. I just stumbled on this thread. It was my CN cold-temp post. My old Coronado (ASP60 DS) was only really usable above 50 F and I never figured out why. With my LS80 DSII B1800, above 50F was great, 30-50F was fine but you could detect a loss, and below 30F really lost detail. I lived with th...