Search found 628 matches

by thesmiths
Wed Dec 07, 2022 4:15 pm
Forum: Solar Scope Modifications
Topic: Final double stack set up for our 102mm refractor
Replies: 9
Views: 188

Re: Final double stack set up for our 102mm refractor

Thanks for that. It does seem it really is very basic glass. I guess it's not necessary to use fancy low dispersion glass for this application. I have seen similar looking telescopes that use FPL53 ED glass and Lanthanum glass lenses to give very low chromatic aberration. Your fine results confirm t...
by thesmiths
Tue Dec 06, 2022 6:07 pm
Forum: Solar Scope Modifications
Topic: Final double stack set up for our 102mm refractor
Replies: 9
Views: 188

Re: Final double stack set up for our 102mm refractor

Which refractor is this exactly? The f6 or f7? I think it's a doublet. Do you know which kind of glass it uses? It looks like a very nice scope for solar, and I think it is sold under a few different brand names around the world. Any specs you have for the telescope would be helpful.
by thesmiths
Tue Nov 29, 2022 2:13 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: lowell observatory spectrograph
Replies: 5
Views: 182

Re: lowell observatory spectrograph

Very nice indeed!! looks heavy though The spectrograph was mounted in the autumn of 1901. Complete, with the necessary counterbalances at the upper end of the telescope, it added 450 pounds to the weight of the telescope tube , which required a corresponding increase in the counterbalances on the d...
by thesmiths
Tue Nov 29, 2022 11:52 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: lowell observatory spectrograph
Replies: 5
Views: 182

The Slipher Spectrograph at Lowell Observatory, Flagstaff, Arizona

https://astronomy.com/magazine/news/2020/04/remembering-vm-sliphers-work-at-lowell slipher12.png Slipher’s astronomical studies went in several simultaneous directions. Shortly after his arrival in 1901, the observatory received a state-of-the-art spectrograph made for the 24-inch Clark refractor, ...
by thesmiths
Mon Nov 28, 2022 6:08 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Spectroheliograms from the 25th Nov 22
Replies: 8
Views: 195

Re: Spectroheliograms from the 25th Nov 22

See this image (on the left) posted by Jean-Francois Petitt https://groups.io/g/Solex-English/message/385. It demonstrates how reflective black PETG is compared to typical black surfaces used in optics.
by thesmiths
Sun Nov 27, 2022 8:14 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Ca-H SHG full disk image with 90mm refractor -- Nov 25
Replies: 8
Views: 206

Re: Ca-H SHG full disk image with 90mm refractor -- Nov 25

I bought my first beginner hand held spectrometer last week. I have been looking at every light bulb with it and this weekend at the cloudy sky. I could see clearly the sodium doublet, hydrogen beta and iron. I was struggling to see the H-alpha line but I did see it for a moment when the Sun came o...
by thesmiths
Sun Nov 27, 2022 7:57 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Spectroheliograms from the 25th Nov 22
Replies: 8
Views: 195

Re: Spectroheliograms from the 25th Nov 22

I had overexposed on the line and resulted in not just the bright areas of the disk near on burning out but also had excessive light leakage in the background. You mention "light leakage". This can be a real issue with the Solex design. As I understand it, some of the plastic components c...
by thesmiths
Sat Nov 26, 2022 11:13 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Spectroheliograms from the 25th Nov 22
Replies: 8
Views: 195

Re: Spectroheliograms from the 25th Nov 22

Those are all really good, especially the H-alpha. The Ca-K is, I think, too high contrast. Did it get that way in processing, or is that how the reconstruction software did it? I find with the Calcium lines, I need to be very careful not to overexpose because there is naturally very high contrast f...
by thesmiths
Sat Nov 26, 2022 11:04 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Ca-H SHG full disk image with 90mm refractor -- Nov 25
Replies: 8
Views: 206

Re: Ca-H SHG full disk image with 90mm refractor -- Nov 25

The 90mm f10 works pretty well. I'm using it now because it's actually quite light so easy to move around indoors (!).
by thesmiths
Fri Nov 25, 2022 6:33 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Ca-H SHG full disk image with 90mm refractor -- Nov 25
Replies: 8
Views: 206

Re: Ca-H SHG full disk image with 90mm refractor -- Nov 25

Looking back at my Ca-H images from the summer , the image below is probably my best result, taken on a day with very good seeing: https://solarchatforum.com/download/file.php?id=70826 Ca-H SHG image. 720mm focal length, 72mm aperture. 2400 l/mm grating. 13x sidereal scan rate. Stack of 9 frames (ou...
by thesmiths
Fri Nov 25, 2022 5:14 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Ca-H SHG full disk image with 90mm refractor -- Nov 25
Replies: 8
Views: 206

Ca-H SHG full disk image with 90mm refractor -- Nov 25

There was a glimmer of unobstructed Sun through my upstairs window between 13:40 and 13:50 today. I took a small number of videos, from which I decided to stack three frames . This was the first time that I tried my 90mm aperture 910mm focal length Sky-Watcher refractor (with foam board SHG) for a w...
by thesmiths
Wed Nov 23, 2022 3:00 pm
Forum: This is SolarChat !!
Topic: AMD Ryzen 7 Windows 11 issues with FPS
Replies: 12
Views: 233

Re: AMD Ryzen 7 Windows 11 issues with FPS

my SSDs were always faster then the camera, otherwise I wouldn't be able to do Autorun continuously. So I'm not using VRAM. Still there is a "lag" after each file (1-2s), but that's ok. I've noticed that the way it seems to work is that data is first written to some sort of intermediate f...
by thesmiths
Tue Nov 22, 2022 3:36 pm
Forum: This is SolarChat !!
Topic: AMD Ryzen 7 Windows 11 issues with FPS
Replies: 12
Views: 233

Re: AMD Ryzen 7 Windows 11 issues with FPS

I just wonder, why it was set as "standard" in the new version. Could also be fixed by code that makes Autorun wait until the writing is done (in an update). In general, the VRAM feature is quite positive since clearly writing to DRAM will always be significantly faster than writing to an...
by thesmiths
Mon Nov 21, 2022 5:36 pm
Forum: This is SolarChat !!
Topic: waiting for sun
Replies: 24
Views: 286

Re: waiting for sun

This was the post I meant: viewtopic.php?t=37829

Did you do some more modifications since that time?
by thesmiths
Mon Nov 21, 2022 5:29 pm
Forum: This is SolarChat !!
Topic: waiting for sun
Replies: 24
Views: 286

Re: waiting for sun

Hi Karsten, as far as I know, you are the only one to try a Newtonian with a Solex. Didn't you post some nice results with this telescope previously? I think the more common fluid for removing the aluminium coating is ferric chloride (used for removing copper from printed circuit boards). Remember t...
by thesmiths
Mon Nov 21, 2022 5:03 pm
Forum: This is SolarChat !!
Topic: AMD Ryzen 7 Windows 11 issues with FPS
Replies: 12
Views: 233

Re: AMD Ryzen 7 Windows 11 issues with FPS

My guess is that FC2.7 uses VRAM to store the entire video file in DRAM and then writes the entire data to SSD. This requires some time (depending on the SSD write speed). I don't use autorun, but I have found issues if I take large video files too close together. I actually wait 5 seconds to make s...
by thesmiths
Mon Nov 21, 2022 3:39 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Updated foamboard spectroheliograph (with larger optics)
Replies: 2
Views: 260

Updated foamboard spectroheliograph (with larger optics)

Since we first built our " foamboard SHG " last year https://solarchatforum.com/viewtopic.php?t=32136 we made incremental improvements (changing the grating, the slit, the collimator lens, including an external helical focuser for the collimator). I thought I would post some photos of the ...
by thesmiths
Fri Nov 18, 2022 10:06 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Hbeta & Halpha spectroheliograms 221114
Replies: 20
Views: 336

Re: Hbeta & Halpha spectroheliograms 221114

I did a bit more digging regarding the SATA2 interface and have found that out of the four sockets two of them are SATA3,the hybrid is plugged into one of them and the optical drive into the other, so tomorrow I will swap the drive for the SSD and run the test again to see if any difference. That w...
by thesmiths
Fri Nov 18, 2022 7:45 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Hbeta & Halpha spectroheliograms 221114
Replies: 20
Views: 336

Re: Hbeta & Halpha spectroheliograms 221114

Your laptop looks like a typical SATA3 SSD speed (the top numbers are the ones to look at). The hybrid looks like a fast HDD, so quite normal. The SSD in the old desktop looks a little slow. This might be because the computer uses an older SATA2 interface, which is likely because the motherboard is ...
by thesmiths
Fri Nov 18, 2022 2:43 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Spectrometer study of H-beta, H-alpha filters and H-alpha etalon
Replies: 10
Views: 277

Re: Spectrometer study of H-beta, H-alpha filters and H-alpha etalon

I was wondering if I could use these images in a talk I need to prepare? they explain what the filter is doing so incredibly well. Of course. The typical H-alpha blocking filter is something like a 1nm bandpass filter, I think? There's a similar discussion of CaK filters here: https://solarchatforu...
by thesmiths
Thu Nov 17, 2022 10:09 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Hbeta & Halpha spectroheliograms 221114
Replies: 20
Views: 336

Re: Hbeta & Halpha spectroheliograms 221114

I have a 500GB SSD which I could clone and fit in the meantime to see if any difference.... Just realized my project for tomorrow :) If you have a spare 500 GB SSD, you could just format it and add it to the computer (no need to clone anything). You just need an extra SATA cable (can scavenge from ...
by thesmiths
Thu Nov 17, 2022 6:36 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Hbeta & Halpha spectroheliograms 221114
Replies: 20
Views: 336

Re: Hbeta & Halpha spectroheliograms 221114

I have a Dell Optiplex 9010 with a 2Tb SSD hybrid (big capacity SSD's weren't around when I got this machine). A hybrid drive is certainly non-ideal for this application (for large files, it will operate at the speed of an HDD). I guess it's that which creates a bottleneck for FireCapture. SharpCap...
by thesmiths
Thu Nov 17, 2022 3:30 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Hbeta & Halpha spectroheliograms 221114
Replies: 20
Views: 336

Re: Hbeta & Halpha spectroheliograms 221114

I may give SharpCap a try in next years season... The business model of SharpCap is quite different than FireCapture so updates and fixes are much more frequent. You can post issues to the SharpCap forum and Robin will typically reply within a day or so. I personally have always used FC but I may a...
by thesmiths
Thu Nov 17, 2022 3:11 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Hbeta & Halpha spectroheliograms 221114
Replies: 20
Views: 336

Re: Hbeta & Halpha spectroheliograms 221114

Firecapture has trouble keeping up with finishing each recording I suspect what FireCapture does is keep all the data it can in the VRAM cache before writing to the computer's SSD. What I do now is at the end of each scan, I wait 5 seconds before starting a new one. I did a calculation regarding th...
by thesmiths
Wed Nov 16, 2022 5:10 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Spectrometer study of H-beta, H-alpha filters and H-alpha etalon
Replies: 10
Views: 277

Re: Spectrometer study of H-beta, H-alpha filters and H-alpha etalon

Just for the fun of it, here is the transmission of a PST etalon observed at a higher spectral resolution. Hi Christian, that's also nice. I guess you removed the PST etalon from the normal front and rear lenses? And you did tuning via tilting rather than what is I think the normal compression tuni...