Search found 584 matches

by GreatAttractor
Sun Sep 23, 2018 11:20 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Grasshopper3 how to ??
Replies: 8
Views: 272

Re: Grasshopper3 how to ??

You need something like this: Baader C-Mount/1.25" adapter, then you can plop the camera into any telescope. FireCapture should work fine for video acquisition.
by GreatAttractor
Sat Sep 08, 2018 7:36 am
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 7
Views: 320

Re: Lunt LS50THa modification to 200 mm aperture

Back focus = distance from the rear of the OTA to the OTA's focal plane. Etalons, telecentrics etc. need to be inside this distance. RC has quite a lot, SCT somewhat less, and adding a focal reducer moves the focal plane in, so reduces back focus.
by GreatAttractor
Fri Sep 07, 2018 3:11 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 7
Views: 320

Re: Lunt LS50THa modification to 200 mm aperture

I would fear the back focus would be insufficient (Lunt 50 needs some ~180 mm). With an SCT it would be easier to simply attach a PST (which works at f/10).
by GreatAttractor
Thu Sep 06, 2018 8:17 pm
Forum: Solar Scope Modifications
Topic: Lunt LS50THa modification to 200 mm aperture
Replies: 7
Views: 320

Lunt LS50THa modification to 200 mm aperture

I present my latest Hα mod, consisting of a GSO Ritchey-Chretien 8" + Aries 214 mm ERF + Lunt 50 etalon assembly. I completed it back in June, but unfortunately haven't had conditions and time for an imaging session yet (beside basic testing). I'm planning on putting it to good use next year. The mo...
by GreatAttractor
Fri Jul 27, 2018 12:25 pm
Forum: This is SolarChat !!
Topic: CBSAP shutting down September 1st
Replies: 28
Views: 1465

Re: CBSAP shutting down September 1st

Stephen, thank you for the priceless popularization and outreach work you've done.
I'm sure the Solarchatters can keep this wonderful forum running.
by GreatAttractor
Thu Jul 12, 2018 8:32 pm
Forum: This is SolarChat !!
Topic: Imppg file type question
Replies: 2
Views: 219

Re: Imppg file type question

Hi Don, ImPPG is for post-processing still images (stacks made with e.g. AutoStakkert!3) and alignment of images for a time lapse. For stabilizing a video like this you'd have to convert it to a series of frames. It'll be easier to use PIPP . But if you meant to stack this video, just feed it direct...
by GreatAttractor
Thu Jul 05, 2018 2:55 pm
Forum: This is SolarChat !!
Topic: SUN 20180703 animated gif
Replies: 17
Views: 545

Re: SUN 20180703 animated gif

Excellent result and great details.
Question: I have problems finding a program to align the single frames. I have tried Registax5 and 6 but none of them will align my images.
Try ImPPG, menu Tools/Align image sequence....
by GreatAttractor
Mon Jun 04, 2018 7:58 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New polarized light sensor
Replies: 0
Views: 448

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: 847

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: 582

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: 647

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: 647

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: 731

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: 395

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: 413

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: 1087

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: 1087

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: 1196

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: 991

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: 493

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: 1244

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: 1244

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: 853

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: 33
Views: 1919

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: 772

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 ;)