Search found 96 matches

by george9
Sun Feb 24, 2019 3:02 am
Forum: This is SolarChat !!
Topic: CaK, 23022019. Double plus triple.
Replies: 7
Views: 425

Re: CaK, 27022019. Double plus triple.

All look good, Bart. Does the third one have a little more gradation of brightnesses in the active region compared to the other two? The first definitely has the least. The second is similar to the third in that respect, but may be a little more washed out in the rest of the disk (non-AR). So that w...
by george9
Mon Feb 18, 2019 12:32 pm
Forum: This is SolarChat !!
Topic: CaK, 16022019. SolarMonitor plus experiments
Replies: 17
Views: 718

Re: CaK, 16022019. SolarMonitor plus experiments

Got it now. Thanks. Awesome project (I had read the thread and its earlier one, but couldn't find it.) So without the 6mm.

Do you think the improvement in #3,4,5 is due to narrowing around 393nm, or due to better blocking of more distant wavelengths, say UV or IR?

George
by george9
Mon Feb 18, 2019 1:19 am
Forum: This is SolarChat !!
Topic: CaK, 16022019. SolarMonitor plus experiments
Replies: 17
Views: 718

Re: CaK, 16022019. SolarMonitor plus experiments

Bart, is the "Lunt blocking filter" their CaK (e.g., B1200), or part of that, or something else? To me, your #3,4,5 are somewhat similar, and all better than #1,2. Those would be triple stacked, more or less if the Lunt filter is the CaK because isn't the bandpass of the CaK about the same as one PS...
by george9
Thu Feb 14, 2019 2:31 pm
Forum: This is SolarChat !!
Topic: The effect of a circular polarizer in a double stack
Replies: 17
Views: 1108

Re: The effect of a circular polarizer in a double stack

I agree it is important what the etalons and blocking filters are doing. In my case, the circularly polarized light seems to get fully through the second etalon and blocking filter because the binoviewer, which polarizes when it splits, lets equal light through the two eyepieces. I checked my notes ...
by george9
Wed Feb 13, 2019 12:00 pm
Forum: This is SolarChat !!
Topic: The effect of a circular polarizer in a double stack
Replies: 17
Views: 1108

Re: The effect of a circular polarizer in a double stack

Yes exactly. Thanks both. George
by george9
Tue Feb 12, 2019 4:13 pm
Forum: This is SolarChat !!
Topic: The effect of a circular polarizer in a double stack
Replies: 17
Views: 1108

Re: The effect of a circular polarizer in a double stack

Just bumping the thread to see if there are any thoughts why the backwards circ polarizer is recommended when forward works great (see last post). George
by george9
Mon Feb 11, 2019 1:13 am
Forum: This is SolarChat !!
Topic: The effect of a circular polarizer in a double stack
Replies: 17
Views: 1108

Re: The effect of a circular polarizer in a double stack

Sorry I missed this thread. The circular polarizer is highly efficient at eliminating reflections at a cost of attenuating the main image. My experiments show that it works facing both ways. I place it forward-facing so that I can still use my binoviewer for visual. That way light comes out circular...
by george9
Sat Feb 09, 2019 6:23 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Help me decide on solar setup
Replies: 8
Views: 1132

Re: Help me decide on solar setup

I am a fan of double stacking. Some say that is more important for visual than for imaging, and others find it very important for imaging. I am visual for H-alpha and neophyte imaging in CaK. You mention the LS80, and I love my LS80 DSII with B1800. I optimized it over time with a circular polarizer...
by george9
Wed Jan 23, 2019 3:02 am
Forum: This is SolarChat !!
Topic: What does 656.281 nm look like?
Replies: 12
Views: 734

Re: What does 656.281 nm look like?

Others are more expert than me, but it looks like you may need to go to higher temperatures and then work your way back. Based on the pattern of spots, 53.5 seems off band, but on the other end, 57.2 seems near the center line.

George
by george9
Mon Jan 21, 2019 10:01 pm
Forum: This is SolarChat !!
Topic: CaK set-up and first try, 20012019
Replies: 17
Views: 790

Re: CaK set-up and first try, 20012019

Very nice, Bart. When you say, "Baader CaK filter mounted in two separate filter cells," do you mean the Baader K-line filter, with the two filters separated into two cells? If so, I am curious why the separation. To change tilt? I did Baader CCD Blue -> Baader K-line (pair in original cell) -> sing...
by george9
Sun Jan 13, 2019 8:48 pm
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

Very nice improvement. There was a bump of a prom with a filaprom to a subtle AR below it today (much like what I see above), but if these were taken yesterday, it would have moved by now. Amazing what the processing brings out (earlier post).

George
by george9
Wed Jan 02, 2019 2:58 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

Here is my setup. The main scope is a 155mm f/7. You see a 4" focuser, a Precise parts adapter, the DSII unit from an LS80, a spacer, an adapter to the Feathertouch, a 2" Feathertouch focuser with 2.5" draw tube (racked all the way out), the Quark chromosphere (with 4.2x), a Baader T2 prism, and a 3...
by george9
Wed Jan 02, 2019 2:46 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

Hi, Brian. I have a classic Quark chromosphere (i.e., not combo). As I said, pretty narrow at around .5-.6A. I don't image, but I can describe the visual. No more double limb. Prominences have varied brightnesses, some are same as the solar disk and some are dimmer, leading to a slight filaprom wher...
by george9
Wed Jan 02, 2019 2:30 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

Thanks. I just can't think of a way to attach it to the Lunt, which has no thread at the end. I can rig up a clamp, but then it won't fit into the 2" focuser. Thin cellophane tape can hold it on, I guess.

George
by george9
Wed Jan 02, 2019 1:31 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

Won't the Quark etalon itself will serve as the blocking filter for the PST? That is, even if the Quark blocker were 20A (i.e., seemingly too wide), the etalon would block spikes for example 8A away from its centerline. Is the concern that the etalon has high shoulders and won't block enough of the ...
by george9
Wed Jan 02, 2019 12:31 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

Others are more expert on the PST, but yes I think the lenses you removed are the lenses that allow it to work with the f/10 objective of the PST. So you'll need them if you use the PST etalon before the Quark. I assume on the C8, you will need the collimating lenses. That's a little more complicate...
by george9
Wed Jan 02, 2019 12:21 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

I got the Baader CCD blue and it works as advertised. 92mm f/7 to Baader CCD blue to Baader K-line to ND filter to PST#1 to R2 video camera produced a nice image today. That main active region was so bright. The best image, of course, was 92mm to Lunt B1200 CaK to PST#1 to R2. Two questions. Will th...
by george9
Wed Jan 02, 2019 12:06 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

(I agree after the Quark you would want bare etalon. And before the Quark you need collimation and enough energy reduction but no other blocking. George)
by george9
Wed Jan 02, 2019 12:03 am
Forum: Solar Scope Modifications
Topic: PST Etalon with a Quark, Log & Results
Replies: 115
Views: 7997

Re: PST Etalon with a Quark, Log & Results

I use my Lunt DSII unit (intended for an LS80, about 35mm aperture) before my Quark in my 155mm f/7 scope. I cannot visually detect a double limb at all double stacked. With the lone Quark, the double limb is very bright. I estimate my Quark in the 0.5-0.6A range. No idea what the DSII is because I ...
by george9
Wed Dec 26, 2018 1:04 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

Wow! Did some testing today and was surprised by the quality of the result in my R2. I never thought to check if my 1.25" cells had threads on both ends. Out in the field, sure enough, no. The Baader K-line cannot take another filter, and neither can my PST#1 the way I mounted it in my cell. I made ...
by george9
Tue Dec 25, 2018 1:12 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

> The Astronomik is the best UV/IR filter to have for CaK as it passes 393nm without attenuation. Mark, careful on the Astronomik if you ever need to replace. Your graph looks like the old Astronomik UV-IR filter, which is no longer offered. Now there is an L-1, L-2, and L-3. Their literature says t...
by george9
Tue Dec 25, 2018 12:09 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

Awesome images, Marty. My Baader K-line arrived today (purchased on AM for a reasonable price). I wish there was something to image now to test it out. My main reason for trying without the Lunt is just that you don't really understand something until you do it yourself. All the vagaries of reflecti...
by george9
Mon Dec 24, 2018 5:17 pm
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

Awesome, Bob! Thanks. These few message tell a lot and reflect a lot of experience. The Baader blue is not overly expensive, so that's easy enough. I don't have the Chroma 1nm yet. And of course, given I have the Lunt, I don't really need any of these. Just having fun experimenting, and also plannin...
by george9
Mon Dec 24, 2018 1:36 pm
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

Thanks so much, Marty, Ken, and Mark. This is exactly what I was asking. Mark, on this one, "My current double stack CaK setup is as follows (in the direction of light) Baader K line, KG3, PST#1, PST#1, Edmunds optics 387/11," the Edmunds presumably clips the longer side of the band (down to 50% at ...
by george9
Mon Dec 24, 2018 3:37 am
Forum: Solar Scope Modifications
Topic: Calcium K blocking filter
Replies: 17
Views: 1573

Re: Calcium K blocking filter

Thanks, Marty. Right now I own the PST and the Calcium k-line but not the Chroma or the blue CCD or the KG3. So I was deciding what I would need to add.

I also have a UV-IR cut but proved it passes 393nm well. But maybe the blue CCD would be the one to add.

George