Search found 1517 matches

by MalVeauX
Sat Mar 06, 2021 3:11 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

Hi Christian.... Just looping back to the math and the additional formulas and terms you sent along... Hi Brian, The calculation is straigtforward, the radius of the sweet spot is given by : theta = n x sqrt (delta lambda) x f/F with theta in degree, n : index of the etalon gap (n=1 for air-spaced ...
by MalVeauX
Sat Mar 06, 2021 2:22 am
Forum: This is SolarChat !!
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 41
Views: 790

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

That's brilliant Apollo, a 1 inch thick tilting chamber that can take 1.25" filters is golden for this.

Very best,
by MalVeauX
Fri Mar 05, 2021 9:48 pm
Forum: This is SolarChat !!
Topic: AR2806, AR2807, Prominences | HA, CaK | March 5th 2021
Replies: 11
Views: 111

Re: AR2806, AR2807, Prominences | HA, CaK | March 5th 2021

With 1.2 to 1.5 arc-seconds an 120mm works still so nicely? Do you have the SSM graph with the violet photo moments at hand to upload? 1.2 arc seconds supports a 120mm aperture in 656nm (red) wavelengths, so it was able to get near critical sampling. I actually didn't saves any graphs today, the se...
by MalVeauX
Fri Mar 05, 2021 8:14 pm
Forum: This is SolarChat !!
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 41
Views: 790

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

Excellent results Marty ! Thanks for sharing.This is in agreement with what I've found (with mica-spaced etalons). Just wondering whether who could replace the whole BF by two stacked 1.7 A. You might just need to add an ITF (like Beloptik's one). Well done Apollo. I don't think there is much to ga...
by MalVeauX
Fri Mar 05, 2021 7:54 pm
Forum: This is SolarChat !!
Topic: AR2806, AR2807, Prominences | HA, CaK | March 5th 2021
Replies: 11
Views: 111

AR2806, AR2807, Prominences | HA, CaK | March 5th 2021

Heya, Had another clear morning with fair seeing. Seeing was around 1.2 arc-seconds to 1.5 arc-seconds for most of this, it barely supported the 120mm aperture, but I wanted to get moderate-high resolution captures of the two AR's while they were still around and active before going back to work. Th...
by MalVeauX
Fri Mar 05, 2021 7:35 pm
Forum: This is SolarChat !!
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 41
Views: 790

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

Heya, Another update, to make sure it wasn't just a good day or fluke. Did the tests again, but with a larger aperture in fair seeing conditions with a 120mm F10 scope and the PST etalon + double stacked 1.7A & 6A blocking filters in the Skybender on AR2806, AR2807 and the two prom areas. Limb supre...
by MalVeauX
Fri Mar 05, 2021 3:50 am
Forum: This is SolarChat !!
Topic: 4 March AR12807, humble first WL with C8
Replies: 10
Views: 96

Re: 4 March AR12807, humble first WL with C8

:-) :-) :-) Following your previous advice Marty, I have already ordered and am waiting for: Astronomik ASHA12nm - H Alpha CCD Filter, 12 nm and Baader IR pass filter 1.25" (685 nm) Will try them as soon as they arrive and have good seeing. The next two days seem also <1.0 arc-second, but won't hav...
by MalVeauX
Fri Mar 05, 2021 2:37 am
Forum: This is SolarChat !!
Topic: 4 March AR12807, humble first WL with C8
Replies: 10
Views: 96

Re: 4 March AR12807, humble first WL with C8

Thanks Marty! Very encouraging words. :-) All the best, Alexandros For your next opportunity, try using a red filter (610nm~656nm) instead of a 540nm filter. 540nm is a shorter wavelength and has higher angular resolution, but it requires significantly better seeing conditions to record. You're alr...
by MalVeauX
Fri Mar 05, 2021 1:47 am
Forum: This is SolarChat !!
Topic: 4 March AR12807, humble first WL with C8
Replies: 10
Views: 96

Re: 4 March AR12807, humble first WL with C8

Your seeing was rather good to generate that resolution and image quality at that image scale. So congrats! I think its very good image! And a very promising start on your journey through high res.

Very best,
by MalVeauX
Fri Mar 05, 2021 12:45 am
Forum: This is SolarChat !!
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 41
Views: 790

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

win! So this pretty much confirms that it is indeed possible to improve a cheap etalon at the eyepiece with two of these andover filters in place of the standard blocker. I will mail you a second one, then we can get a rock solid claim out there on this phenomena. Perhaps lunt, or daystar will list...
by MalVeauX
Fri Mar 05, 2021 12:40 am
Forum: This is SolarChat !!
Topic: Half duration video recordings in FireCapture and SER files
Replies: 14
Views: 131

Re: Half duration video recordings in FireCapture and SER files

Sounds good, 160 FPS is plenty good result.

Very best,
by MalVeauX
Thu Mar 04, 2021 11:22 pm
Forum: This is SolarChat !!
Topic: Half duration video recordings in FireCapture and SER files
Replies: 14
Views: 131

Re: Half duration video recordings in FireCapture and SER files

Heya, Sounds like laptop hardware to me. The system bus is going to be the limit regardless, and most laptop hardware will not have the same throughput as desktop hardware. Your hardware should be able to handle this throughput. You could try testing the write speed of your SSD. You can test the SSD...
by MalVeauX
Thu Mar 04, 2021 10:43 pm
Forum: This is SolarChat !!
Topic: AR's 2806 & 2807, HA CAK & WL | March 4th 2021
Replies: 8
Views: 101

Re: AR's 2806 & 2807, HA CAK & WL | March 4th 2021

justapictureposter wrote:
Thu Mar 04, 2021 10:37 pm
looks great! did you ditch the maier filter on these?
Indeed, no ITF as you suggested.

Full report:

viewtopic.php?f=4&t=30810&start=25#p283454

Very best,
by MalVeauX
Thu Mar 04, 2021 7:35 pm
Forum: This is SolarChat !!
Topic: March 3 2021 images. Playing with color.
Replies: 22
Views: 202

Re: March 3 2021 images. Playing with color.

Good captures James!

Very best,
by MalVeauX
Thu Mar 04, 2021 7:19 pm
Forum: This is SolarChat !!
Topic: AR's 2806 & 2807, HA CAK & WL | March 4th 2021
Replies: 8
Views: 101

AR's 2806 & 2807, HA CAK & WL | March 4th 2021

Heya, It rained yesterday but was clear this morning today, so I had a chance to look at AR's 2806 & 2807. They're small active regions, with tiny sunspot pores, no visible penumbra developed on either, but lots of lovely plage and filament activity between their poles. Took a look at them in HA, Ca...
by MalVeauX
Thu Mar 04, 2021 6:52 pm
Forum: This is SolarChat !!
Topic: blocking filter chit chat chop chop - lets cut it out.
Replies: 41
Views: 790

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

Heya, I have an update with tests of double stacking a 1.7A and 6A blocking filter set with a single etalon. Setup: PST Etalon with both F10 collimation lenses in place (front collimation lens is extended forward to achieve focus) Skybender (inserted into PST etalon back adapter) + Apollo's 1.7A blo...
by MalVeauX
Thu Mar 04, 2021 2:47 am
Forum: This is SolarChat !!
Topic: Half duration video recordings in FireCapture and SER files
Replies: 14
Views: 131

Re: Half duration video recordings in FireCapture and SER files

Many thanks Marty for the rich and detailed answers! 1) You are absolutely right. I read a lot in the meanwhile in cloudy nights about the reasons and mainly by increasing the amount of RAM available for Firecapture (in Heapsize of Generall FC settings) my average FPS increased very significantly. ...
by MalVeauX
Thu Mar 04, 2021 12:39 am
Forum: This is SolarChat !!
Topic: Half duration video recordings in FireCapture and SER files
Replies: 14
Views: 131

Re: Half duration video recordings in FireCapture and SER files

Heya, It would help to know more about the PC you're using, components, media that you're writing this data to, etc. 1) When you capture, there are log files for each capture. Share them? This will help immensely to know exactly what you had set. If you were dropping frames, it will result in a shor...
by MalVeauX
Wed Mar 03, 2021 7:05 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

Hello Marty, Ok, I see. Then the calculation is completely different since there is no telecentric or collimated beam falling onto the etalon. In the first case, you just have a f/16.67 beam. It means you will have both: - an enlargement of the FWHM (compared to its nominal value) because of the f/...
by MalVeauX
Wed Mar 03, 2021 5:34 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

Hrm, Any help with this? Mica spaced etalon, 21mm aperture (Quark Combo) 60mm aperture F16.67 telescope (1000mm focal length) Sweet spot size and general thoughts? I just rough calced it with n=1.6 and the result was 1.59 degrees approximately? This seems to agree with the graph above? I'm curious ...
by MalVeauX
Wed Mar 03, 2021 4:33 pm
Forum: This is SolarChat !!
Topic: Computer help required Please-SOLVED...Phew
Replies: 11
Views: 157

Re: Computer help required Please-SOLVED...Phew

Glad you got this sorted Stu, was late to the party on this one. For anyone wanting to know why, it has to do with container registration. So when prompted if you want to associate specific file types (.SER for example) to a particular piece of software (SER player) it will then be able to automate ...
by MalVeauX
Wed Mar 03, 2021 3:46 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

Hi Marty, You can not determine much because the Quark does not specify a FWHM - you'd have to measure this for your filter before anything else could be determined. Once you do this, you can use the equation I posted above to determine the size of the Jacquinot spot for this filter - which again i...
by MalVeauX
Wed Mar 03, 2021 2:55 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

Hrm, Any help with this? Mica spaced etalon, 21mm aperture (Quark Combo) 60mm aperture F16.67 telescope (1000mm focal length) Sweet spot size and general thoughts? I just rough calced it with n=1.6 and the result was 1.59 degrees approximately? This seems to agree with the graph above? I'm curious h...
by MalVeauX
Tue Mar 02, 2021 5:32 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

It's finding that winning combination Marty, just takes time! Ain't that the truth. The problem is there's very little selection and no standard for quality. I'm not willing to drop $6k on a Quantum (or more) and really don't feel like doing $8k~16k on a SolarSpectrum, looking at the rear mica spac...
by MalVeauX
Tue Mar 02, 2021 3:13 pm
Forum: Solar Scope Modifications
Topic: Sweet spot, banding and tilted etalons ...where are the limits ?
Replies: 49
Views: 626

Re: Sweet spot, banding and tilted etalons ...where are the limits ?

Thanks guys, the math helps a lot!

:bow :bow

It really helps to emphasize that large etalons that are front mounted are rather important for a double stack with respect to the full disc FOV to ensure that a double stack sweet spot keeps a full disc within the sweet spot FOV.

Very best,