Search found 1546 matches

by MalVeauX
Thu May 13, 2021 7:35 pm
Forum: This is SolarChat !!
Topic: Thank you!!! Excitement!!! First light Lunt130MT
Replies: 5
Views: 73

Re: Thank you!!! Excitement!!! First light Lunt130MT

Congrats!

And WOW for being able to have someone hold this big scope on a chair and table with hands and hand track with a camera or eyepiece. I don't think I would have had the guts to attempt that and fear dropping it! WOWZERS!

Very best,
by MalVeauX
Sun May 09, 2021 9:33 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Fishing around for the "right" focal length
Replies: 1
Views: 100

Re: Fishing around for the "right" focal length

Hi, Depends on your seeing more so than anything if you care to image. The AT102ED (102mm F7, ED frac) is a great option for this, good focuser. Another great one is the T.S. 102mm F11 ED with great focuser too (and can be modular for binos natively), for a great price and is really excellent in all...
by MalVeauX
Sun May 09, 2021 2:45 pm
Forum: This is SolarChat !!
Topic: AR2822 (WL, HA, CaK) | May 9th 2021
Replies: 4
Views: 67

AR2822 (WL, HA, CaK) | May 9th 2021

Heya, Happy mother's day to all, hope you have a wonderful weekend or memory of your loved ones! I was able to get a little sky time this morning, a quick 20ish minute session. Seeing was fairly good this morning with a much smaller temperature delta as my summer weather is rolling in after a weird ...
by MalVeauX
Wed Apr 28, 2021 12:38 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: SCT Celestron 9.25 for Solar Imaging
Replies: 13
Views: 871

Re: SCT Celestron 9.25 for Solar Imaging

Hi, I wouldn't bother with your SCT at all for this. Whatever aperture you were going to off-axis mask to, would be 100% better realized with the same aperture refractor. An off-axis aperture masked SCT is something I would not suggest for any solar imaging at all, it exists as a convenience only fr...
by MalVeauX
Wed Apr 28, 2021 12:36 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Tips on buying a 150mm telescope for solar photography
Replies: 15
Views: 462

Re: Tips on buying a 150mm telescope for solar photography

Hi, First, I would say you need to get an idea of your seeing conditions. Taking a mica-spaced etalon to F30~F40 with a 150mm aperture requires excellent seeing conditions, even with a reducer. To even benefit this aperture's resolution potential you need around 1 arc-second seeing (slightly better ...
by MalVeauX
Wed Apr 28, 2021 11:12 am
Forum: This is SolarChat !!
Topic: Grouping AR2818, AR2820 & AR2821 & Discs | April 27th 2021
Replies: 8
Views: 111

Re: Grouping AR2818, AR2820 & AR2821 & Discs | April 27th 2021

Thanks all, :bow That off-band H alpha is very interesting. Edit: Oh, I see from your equipment list that it’s actually wide-band not off-band. Really interesting. Yes, it's wide-band, I wanted to see what would the view be like with two 1.7A filters stacked together behind a D-ERF on their own. I e...
by MalVeauX
Wed Apr 28, 2021 12:16 am
Forum: This is SolarChat !!
Topic: Grouping AR2818, AR2820 & AR2821 & Discs | April 27th 2021
Replies: 8
Views: 111

Grouping AR2818, AR2820 & AR2821 & Discs | April 27th 2021

Heya, Well, it's been a hot minute for me, between horrible weather as summer comes in with storms and just a messy work schedule. Seeing has been horrible lately. I've done more visual than imaging the past 30+ days and today's the first day I've solar imaged in over 30 days due to weather here in ...
by MalVeauX
Sun Apr 25, 2021 1:22 pm
Forum: Solar Software
Topic: ImPPG version 0.6.3
Replies: 14
Views: 396

Re: ImPPG version 0.6.3

Huge thanks for keeping this going, great software, the GPU optimization was such a huge leap!

Very best,
by MalVeauX
Mon Apr 12, 2021 12:40 pm
Forum: Solar Software
Topic: Using flats with full disk solar images
Replies: 16
Views: 250

Re: Using flats with full disk solar images

Hi Ken,

The PST image had newtonian rings.

I'll have to try and re-create a situation with newtonian rings and the flat used soon. But almost all of my setups have a degree of newtonian rings. I use flats on everything to eliminate them.

Very best,
by MalVeauX
Sun Apr 11, 2021 12:42 pm
Forum: Solar Software
Topic: Using flats with full disk solar images
Replies: 16
Views: 250

Re: Using flats with full disk solar images

Hi, I approached full and partial discs flat calibration from a lighting perspective from photography. Diffusion. We commonly seek to avoid diffusion in our glass in solar system imaging as we want higher contrast. But if we want soft gradients of light, we want diffusion, induced light scatter with...
by MalVeauX
Fri Mar 26, 2021 3:03 am
Forum: This is SolarChat !!
Topic: Combine disc and prom stacking
Replies: 16
Views: 316

Re: Combine disc and prom stacking

I have seen reference to a Stephen Ramsdem post on this forum in which he describes image processing steps in which he combines stacking of solar disc images with stacking of prom images. I have spent some time searching for this post but have come up empty. Can anyone direct me to it? Any other co...
by MalVeauX
Thu Mar 25, 2021 11:54 am
Forum: This is SolarChat !!
Topic: Apollo Lasky banned again
Replies: 9
Views: 467

Re: Apollo Lasky banned again

I agree with Bob, very well stated, thoughtful and meaningful. This whole thing seems personal to me. Why make a public notice and spectacle out of it? Especially with so much contrary stuff to the point of it looking very personal? It's sad because so many forums do not allow people to have open co...
by MalVeauX
Fri Mar 19, 2021 2:14 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

I look forward to any tests; I unfortunately can't test CaK for this as I only have a Lunt 2.4A B1200 filter for CaK. Always hunting for an affordable second filter to stack with it. But like with HA, it's likely possible to stack filters and push towards selectivity of CaK band and maybe see at lea...
by MalVeauX
Fri Mar 19, 2021 11:54 am
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Thanks Ken, Interesting so its one main CaK filter and the rest attenuate up to that point? As for proms & filaments, it's much easier to capture proms in CaK because there's no photosphere behind them, so the surface brightness of the prom vs the void (plus any glow) is similar to how you can l...
by MalVeauX
Thu Mar 18, 2021 10:47 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Marty, When the seeing cooperates I can record filaments in CaK as well as the occasional prom. Interesting, so your surface filaments on the disc are easy to notice and not just subtle? Would love to see an example of that (unprocessed vs processed would be ideal to get an idea of things). Mind sh...
by MalVeauX
Thu Mar 18, 2021 1:38 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Merlin66 wrote: Thu Mar 18, 2021 7:09 am I’ve measured my DIY CaK filter assembly to be close to 1A.
One of the benefits of having a high resolution spectroscope.
Hi Ken,

Does it show filaments on the surface? Or does it need to be even more narrow?

Very best,
by MalVeauX
Thu Mar 18, 2021 4:26 am
Forum: This is SolarChat !!
Topic: AR2810 & AR2808 | March 17th 2021
Replies: 8
Views: 142

AR2810 & AR2808 | March 17th 2021

Heya, I missed out on the big stuff the past few days due to work, and this morning I had no chance either. But late evening near 6pm Eastern, I was able to do some imaging and the seeing was ok. My mid-day seeing is worst. But my early morning and late evening seeing is generally my best chances. A...
by MalVeauX
Wed Mar 17, 2021 12:03 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Just to point out that an f/30 refractor is better than f/7.5, but neither is as good as an f/7.5 with a TZ4 telecentric element (see Christian's web site). So it is not just getting to the specified f/ratio, but how you get there. On Bob's comment, I do use a collimator followed by a telecentric f...
by MalVeauX
Tue Mar 16, 2021 10:25 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Thanks Bob, Interesting; that's the kind of thing I'm wondering is what can be done without resorting to a $6k setup that may or may not even be superb. I bought Ken's book, been wanting to build a digital SHG for a while now. I need to get back on this one, as I think this is the only reliable way ...
by MalVeauX
Tue Mar 16, 2021 5:36 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

Hi Marty, In a collimator type system, with a really long focal-length (F16~F32+) and relatively small aperture (say 60mm~80mm tops), one can generate a really long focal-ratio. So I'm curious if this can be further used to benefit the FWHM of a narrowband filter, and if so, by about how much (the ...
by MalVeauX
Tue Mar 16, 2021 4:54 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

I guess that's what I'm wondering. In a collimator type system, with a really long focal-length (F16~F32+) and relatively small aperture (say 60mm~80mm tops), one can generate a really long focal-ratio. So I'm curious if this can be further used to benefit the FWHM of a narrowband filter, and if so,...
by MalVeauX
Tue Mar 16, 2021 1:55 pm
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

On the topic of narrowband filters and focal-ratio for the purpose of transmission profile, does anyone know how to calculate or estimate the relationship simply? Yes Marty :-) The basic formulae are there (near the bottom of this page): http://astrosurf.com/viladrich/astro/instrument/solar/FP.htm ...
by MalVeauX
Tue Mar 16, 2021 11:53 am
Forum: This is SolarChat !!
Topic: CaK disc comparison between SS and DS
Replies: 55
Views: 1318

Re: CaK disc comparison between SS and DS

On the topic of narrowband filters and focal-ratio for the purpose of transmission profile, does anyone know how to calculate or estimate the relationship simply? Example would be, how a 2.4A Calcium K filter, like Lunt's, behaves in an F10 focal-ratio compared to F16 focal-ratio compared to F32 or ...
by MalVeauX
Mon Mar 15, 2021 12:00 pm
Forum: Solar Scope Modifications
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 32
Views: 1572

Re: blocking filter chit chat chop chop - lets cut it out.

Hi Will this idea work for visual use? Cheers. Andrew. Hi, yes, it's the same either way (visual or imaging). I used it visually to test as well and the view was dimmer as expected, just as a double stack etalon would be dimmer, but with high contrast and was still very pleasing to view through (8m...
by MalVeauX
Sun Mar 14, 2021 11:53 pm
Forum: This is SolarChat !!
Topic: AR2808 & AR2809 | March 14th 2021
Replies: 12
Views: 186

Re: AR2808 & AR2809 | March 14th 2021

That animation is pretty amazing, check out the perfect circle of repulsion forces surrounding the pore. This is noteworthy! You gotta get more of these out there, i am hooked. I should have gone longer for sure, I hadn't planned on animating, just happened to get lucky that each 30 second clip had...