Search found 577 matches

by GreatAttractor
Mon Jun 04, 2018 7:58 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New polarized light sensor
Replies: 0
Views: 142

New polarized light sensor

I got an e-mail from FLIR about the new polarized light sensor from Sony (implying upcoming new cameras, I guess), IMX250MZR. Found some infographics: https://thinklucid.com/tech-briefs/polarization-explained-sony-polarized-sensor/ In short, every pixel has an individual polarizer; pixels are divide...
by GreatAttractor
Sun Jun 03, 2018 2:37 pm
Forum: This is SolarChat !!
Topic: AR12709 remnants close up in the Ca II K line.
Replies: 16
Views: 438

Re: AR12709 remnants close up in the Ca II K line.

That's a great "diamond dust", Valery!

TheSkyBurner, that's an interesting comparison indeed.
by GreatAttractor
Sun Jun 03, 2018 10:04 am
Forum: This is SolarChat !!
Topic: Sunday Sun 3rd June_RCT_Ha
Replies: 13
Views: 234

Re: Sunday Sun 3rd June_RCT_Ha

Great resolution, Stu. I love the looks of the setup too.
by GreatAttractor
Mon May 28, 2018 9:20 am
Forum: This is SolarChat !!
Topic: Advice on Firecapture/FLIR Spinnaker SDK ?
Replies: 12
Views: 304

Re: Advice on Firecapture/FLIR Spinnaker SDK ?

Thanks for verifying this, Lou. I'll check the Spinnaker out and see about adding the support to PlanetaryImager (my Chameleon3 should work with Spinnaker according to the PGR website).
by GreatAttractor
Sun May 27, 2018 9:46 am
Forum: This is SolarChat !!
Topic: Advice on Firecapture/FLIR Spinnaker SDK ?
Replies: 12
Views: 304

Re: Advice on Firecapture/FLIR Spinnaker SDK ?

That's strange, I'd think all cameras should still be supported by FlyCapture SDK. Did you try accessing the camera via the FlyCapture's application FlyCap?
by GreatAttractor
Thu May 17, 2018 11:48 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Newton Rings and CCD Fringing
Replies: 4
Views: 386

Re: Newton Rings and CCD Fringing

Mark, could you specify you Chameleon3's model number? My CM3-U3-13S2M-CS (sensor: ICX445) doesn't show rings in any of my Hα setups (Omega Optical, Lunt 35, Lunt 50 and their mods, Barlowed or not).
by GreatAttractor
Mon May 14, 2018 5:20 pm
Forum: This is SolarChat !!
Topic: Moat flow
Replies: 4
Views: 226

Moat flow

I was checking arxiv.org today and if I'm not mistaken, the outflow around a sunspot's penumbra (granules spreading outward over a limited range from the penumbra), something I noticed back in 2012 in my WL animations, e.g. here: https://astrob.in/23205/D/rawthumb/gallery/get.jpg?insecure is probabl...
by GreatAttractor
Mon May 14, 2018 4:46 pm
Forum: This is SolarChat !!
Topic: AR12708 in H-a and at 655nm 280mm
Replies: 6
Views: 237

Re: AR12708 in H-a and at 655nm 280mm

Cracking shots, Valery! The seeing was unfortunately unusable for me.
by GreatAttractor
Mon May 14, 2018 4:45 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Omega Optical CaH filter
Replies: 16
Views: 590

Re: Omega Optical CaH filter

Thank you everyone for input. CaK imaging is a plan for the future anyway, it's Hα for me right now.
by GreatAttractor
Sat May 12, 2018 8:00 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Omega Optical CaH filter
Replies: 16
Views: 590

Omega Optical CaH filter

I was browsing through Omega Optical filters on Ebay and noticed this:

Optical Filter Astronomy 396.9SC0.2 Ca H filter 1.25"

(full description: link)

CaH with 2 Å bandwidth and 90% transmission for $300. Seems promising, what do you think?
by GreatAttractor
Wed May 09, 2018 1:08 pm
Forum: This is SolarChat !!
Topic: C11 out for a third time and it gets better and better!
Replies: 21
Views: 804

Re: C11 out for a third time and it gets better and better!

Wonderful images, Alexandra. Please try an animation next time, however short! I was amazed staring at the screen and watching a near perfect solar granulation through the C11, it was the most beautiful experience of my life. I know exactly what you mean, happened to me too on those handful of occas...
by GreatAttractor
Sat May 05, 2018 1:38 pm
Forum: This is SolarChat !!
Topic: First Light with Celestron C11
Replies: 21
Views: 668

Re: First Light with Celestron C11

Excellent results, Alexandra. I like the filter holder, what brand is it? (Or is it homemade?).
by GreatAttractor
Wed May 02, 2018 4:23 pm
Forum: This is SolarChat !!
Topic: First test with APM 152/F8 telescope
Replies: 6
Views: 298

Re: First test with APM 152/F8 telescope

It seems to me that seeing was just fine, great images! Clearly much higher resolution on the mottles than what I get from my 90 mm.
by GreatAttractor
Wed May 02, 2018 10:27 am
Forum: This is SolarChat !!
Topic: Does a reducer work to achieve F10?
Replies: 20
Views: 772

Re: Does a reducer work to achieve F10?

bart1805 wrote:
Wed May 02, 2018 8:06 am
is the secondary f10?
Actually, f/10 is the effective focal ratio of the primary-secondary combination (so you're good to go). E.g. in an f/15 MCT there may be an f/3 primary and an f/5 secondary.
by GreatAttractor
Wed May 02, 2018 7:24 am
Forum: This is SolarChat !!
Topic: Does a reducer work to achieve F10?
Replies: 20
Views: 772

Re: Does a reducer work to achieve F10?

I believe the f/10 beam from the Mak should be fine, but the real problem is having enough back-focus (~200 mm for PST). You'd need to check how far you can pull the focal plane out (plus there's the effect of changing effective f.l. when the distance of Mak's mirrors changes).
by GreatAttractor
Sun Apr 29, 2018 6:26 pm
Forum: This is SolarChat !!
Topic: H-alpha with 250 mm RCT
Replies: 15
Views: 539

Re: H-alpha with 250 mm RCT

Very promising indeed, Stu! Looking forward to when you get better conditions.
by GreatAttractor
Fri Apr 27, 2018 9:53 am
Forum: This is SolarChat !!
Topic: Thermal Acclimation of My Lunt50
Replies: 32
Views: 1123

Re: Thermal Acclimation of My Lunt50

I've also observed the need for an acclimation with my Lunt 50 when used in my mod (with a front D-ERF). I *think* I noticed that for some short time after pointing at the Sun I wouldn't get a detailed image, or that the etalon tuning would drift (sorry, I don't remember exactly). It's possible it w...
by GreatAttractor
Tue Apr 24, 2018 7:28 pm
Forum: This is SolarChat !!
Topic: AR12706 High Res in H-a 280mm SCT + ARIES DERF
Replies: 11
Views: 515

Re: AR12706 High Res in H-a 280mm SCT + ARIES DERF

What a wonderful image. If you use SSM, I'm curious what was the indicated seeing value during this capture.
I hope to post more pictures of this excellent AR12706.
Ehh, this tiny thing is excellent only in >200 mm ;)
by GreatAttractor
Sun Jan 28, 2018 9:58 am
Forum: This is SolarChat !!
Topic: ImPPG installation
Replies: 3
Views: 258

Re: ImPPG installation

Sorry about that, I should probably add a comment there saying you need to click specifically on imppg-win64.zip . As for tutorials, check the "Useful links" section on http://greatattractor.github.io/imppg/. Also, the video tutorial for Stackistry shows some quick-and-dirty processing with ImPPG at...
by GreatAttractor
Sat Dec 30, 2017 10:15 am
Forum: Solar Scope Modifications
Topic: DIY Solar Scintillation Seeing Monitor with FC support
Replies: 113
Views: 12134

Re: DIY Solar Scintillation Seeing Monitor with FC support

I like your results! Good correlation with the quality graph, so the device is working fine. So a SSM is a nice addition but so far not a big help for planning ... It seems to me that (apart from being a fun project) it's mainly useful for big-aperture people to trigger video recording during short ...
by GreatAttractor
Fri Dec 22, 2017 9:19 am
Forum: Solar Scope Modifications
Topic: DIY Solar Scintillation Seeing Monitor with FC support
Replies: 113
Views: 12134

Re: DIY Solar Scintillation Seeing Monitor with FC support

Is it possible that with clouds the scintillation of the sun is less ? I sometimes get high, thin clouds that don't interfere much with recording (judging visually by the raw video and by successful stacking). However, I'd think SSM output through the clouds is meaningless, as the brightness change...
by GreatAttractor
Fri Dec 15, 2017 8:51 pm
Forum: Solar Scope Modifications
Topic: DIY Solar Scintillation Seeing Monitor with FC support
Replies: 113
Views: 12134

Re: DIY Solar Scintillation Seeing Monitor with FC support

As long as you don't use any optics in front of the naked diode, I think recessing won't make a difference. The Sun is thousands of times brighter than any other light source you'll encounter on a typical day, so no "background light shielding" should be needed.
by GreatAttractor
Fri Dec 15, 2017 3:26 pm
Forum: Solar Scope Modifications
Topic: DIY Solar Scintillation Seeing Monitor with FC support
Replies: 113
Views: 12134

Re: DIY Solar Scintillation Seeing Monitor with FC support

Now if I understood correctly that menas that if I have a metal case for the detector then I should not ground it to that metal case ? Right, that's my understanding too. I think I can use them for my ongoing project of the Solar guider I am building. That's cool! Also keep an eye on the Planetary ...
by GreatAttractor
Thu Dec 14, 2017 8:59 pm
Forum: Solar Scope Modifications
Topic: DIY Solar Scintillation Seeing Monitor with FC support
Replies: 113
Views: 12134

Re: DIY Solar Scintillation Seeing Monitor with FC support

It seems clear to me: "not grounded at detector" = "don't try to attach the outer mesh at the detector to an external ground".
by GreatAttractor
Thu Dec 14, 2017 8:57 pm
Forum: This is SolarChat !!
Topic: First try at a big mosaic and an animation
Replies: 15
Views: 660

Re: First try at a big mosaic and an animation

Very good results, I especially like the animation.

Just a small observation, the prominences in the animation seem abruptly clipped. I suggest letting the lower end of the histogram blend smoothly to black.