Search found 235 matches

by bart1805
Thu Sep 20, 2018 8:30 pm
Forum: This is SolarChat !!
Topic: Today's Proms, Full Disc & Animations | HA | Sept 20th 2018
Replies: 7
Views: 99

Re: Today's Proms, Full Disc & Animations | HA | Sept 20th 2018

Nice, too bad the seeing did not cooperate.
The reflection could be the reason the solar observatorium closed. Or a detached prom that is blown away. Or just a reflection somewhere in the optical train. My 50 cents would be on the latter.
by bart1805
Wed Sep 19, 2018 8:54 pm
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 153
Views: 4192

Re: Narrowest 393.37 ever by Apollo Lasky

Thanks Bob and Apollo! So the Lasky CaK seems to behave almost the same as a PST CaK. With indeed the big difference that if I wanted to buy a PST CaK I would have to be very lucky to be really able to buy one. The Lasky CaK costs about 1.300 dollar and requires tilt. So a Skybender would be necessa...
by bart1805
Tue Sep 18, 2018 9:05 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: New Skywatcher Solarquest mount
Replies: 9
Views: 269

Re: New Skywatcher Solarquest mount

The answer is in the manual: 2.3 Envioremental Influence 1. Clouds, especially thick or low clouds might reduce the accuracy of auto-pointing. They might also lead to visible drift of the Sun in the eyepiece while the SolarQuest is tracking the Sun. 2. Strong reflected light, which happens to appear...
by bart1805
Sun Sep 16, 2018 5:18 pm
Forum: This is SolarChat !!
Topic: H-alpha proms, 14 september 2018
Replies: 3
Views: 99

Re: H-alpha proms, 14 september 2018

Thank you Marty!
by bart1805
Sat Sep 15, 2018 10:26 pm
Forum: This is SolarChat !!
Topic: H-alpha proms, 14 september 2018
Replies: 3
Views: 99

H-alpha proms, 14 september 2018

Changed the focuser of my 150mm PST mod, the optical train seems more straight now. Effect was that I had less reflections and a bigger "sweet spot". Seeing was not too good yesterday, but managed to image some nice proms. 160 mm D-erf / 150 mm f/8 Skywatcher / 1,25x Glasspath / Baader 35nm H-alpha ...
by bart1805
Sat Sep 15, 2018 7:59 pm
Forum: This is SolarChat !!
Topic: NEW 12672 large group!!! 280mm + ARIES 295mm DERF + QUARK GREAT SEEING!
Replies: 13
Views: 571

Re: NEW 12672 large group!!! 280mm + ARIES 295mm DERF + QUARK GREAT SEEING!

Hi Valery, I finally changed the settings on my computer, so now the brightness is a lot higher. You were right, and my comment about the darkness of your pictures was caused by the monitor. Watched some of your old posts again, with a brighter monitor they are even more beautiful. Keep them coming ...
by bart1805
Wed Sep 12, 2018 5:26 pm
Forum: This is SolarChat !!
Topic: Tunable Calcium module by Apollo Lasky
Replies: 6
Views: 252

Re: Tunable Calcium module by Apollo Lasky

It was a joke Apollo....
Looking forward to more images with the new filters!
by bart1805
Wed Sep 12, 2018 3:40 pm
Forum: This is SolarChat !!
Topic: Tunable Calcium module by Apollo Lasky
Replies: 6
Views: 252

Re: Tunable Calcium module by Apollo Lasky

That looks really promising! And now a direct comparison with Lunt Coronado please. (-;
PS. When is your birthday? I will send you a cleaning set.
by bart1805
Mon Sep 10, 2018 9:02 pm
Forum: Solar Scope Modifications
Topic: Lacerta Wedge plus Lunt diagonal
Replies: 4
Views: 190

Re: Lacerta Wedge plus Lunt diagonal

Hi Marc, deleted all those avi's. But there will be more. (-;
This weekend tried the Wedge plus prism. With a gain of 37%, so really high, the exposure time was 10 ms. Too much indeed....
by bart1805
Mon Sep 10, 2018 9:16 am
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 153
Views: 4192

Re: 393.4 bp0.1 - yes it does exist.

Don't understand everything in this conversation, but I thought that doublestacking two identical etalons did have an effect on the wing profile. When I doublestack my two PST etalons there is no longer a double limb effect. Am I completely missing the point here?
by bart1805
Sat Sep 08, 2018 8:15 pm
Forum: Solar Scope Modifications
Topic: another PST stage 2 mod
Replies: 29
Views: 1022

Re: another PST stage 2 mod

And now it is a small step to doublestack the etalons. (-;
by bart1805
Wed Sep 05, 2018 10:22 pm
Forum: Solar Scope Modifications
Topic: Lacerta Wedge plus Lunt diagonal
Replies: 4
Views: 190

Re: Lacerta Wedge plus Lunt diagonal

Thanks Mark. I am curious if it leads to less reflections.
by bart1805
Wed Sep 05, 2018 8:19 pm
Forum: This is SolarChat !!
Topic: HR images taken at 396 and 430 nm on August 24 with the 300 mm solar scope
Replies: 18
Views: 413

Re: HR images taken at 396 and 430 nm on August 24 with the 300 mm solar scope

Thanks Christian!
I use the Grasshopper version with the IMX174 sensor. So for one thing, I can't blame the camera if I compare my images with yours. (-;
by bart1805
Wed Sep 05, 2018 8:16 pm
Forum: This is SolarChat !!
Topic: Sun in CaK 5th September
Replies: 7
Views: 199

Re: Sun in CaK 5th September

Nice ones Stu! Do you screw the K-line in the nosepiece of the camera?
by bart1805
Tue Sep 04, 2018 9:30 pm
Forum: Solar Scope Modifications
Topic: Lacerta Wedge plus Lunt diagonal
Replies: 4
Views: 190

Lacerta Wedge plus Lunt diagonal

Hi all, Because I for sure don't want to start my own Will it Burn topic, a question before I try it out. One of the problems with my CaK images are the reflections. So tonight I was trying some different things. If you remove the nosepiece of the Lunt you can screw it directly to a Lacerta Herschel...
by bart1805
Tue Sep 04, 2018 8:09 pm
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 153
Views: 4192

Re: 393.4 bp0.1 - yes it does exist.

Hi Christian,
Baader sells their K-line with the ND 3.8 Astrosolar. Am I correct that you conclude that with this combination one is not able to obtain HR images?
And if you talk about a wedge, it is without the (almost standard) ND 3.0 I suppose. Correct?
Thanks, Bart.
by bart1805
Tue Sep 04, 2018 7:55 pm
Forum: This is SolarChat !!
Topic: HR images taken at 396 and 430 nm on August 24 with the 300 mm solar scope
Replies: 18
Views: 413

Re: HR images taken at 396 and 430 nm on August 24 with the 300 mm solar scope

Thanks Christian. I try to image H-alpha with low gain, so maybe that is the reason I could use fewer frames. But will try it with high gain and more frames to stack: shorter exposure time so better freezing of the seeing.
Gamma is always neutral when you image in these three wavelengths?
CS! Bart.
by bart1805
Tue Sep 04, 2018 10:47 am
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 153
Views: 4192

Re: 393.4 bp0.1 - yes it does exist.

Hi Bob, I think I recognize the horizontal links, and think they are indeed caused by the camera in combination with the very short exposure. When you blow up the PST image you seems to see the same pattern. Gain is zero, gamma neutral? Would a ND 0.6 or 0.8 or a polariser help to get the exposure l...
by bart1805
Mon Sep 03, 2018 10:23 pm
Forum: This is SolarChat !!
Topic: HR images taken at 396 and 430 nm on August 24 with the 300 mm solar scope
Replies: 18
Views: 413

Re: HR images taken at 396 and 430 nm on August 24 with the 300 mm solar scope

Hi Christian, like Raf each time I see your pictures it is a surprise that you stack such a small amount of frames. It is quite the opposite compared to my own workflow, but your pictures inspired me to go through some old data and use far less frames than I usually do. And I am surprised. I can use...
by bart1805
Fri Aug 31, 2018 9:38 am
Forum: This is SolarChat !!
Topic: New camera but which one?
Replies: 32
Views: 649

Re: New camera but which one?

Hi denababy, I use the PGR and it does exactly what it should do, a pleasure to work with. But.... 1) A lot of Newton Rings when I use a Powermate. 2) A USB 2.0 laptop just won't let you use the camera the way it should. You really need USB3.0 and a fast SSD. Otherwise you get a lot of hickups and l...
by bart1805
Thu Aug 30, 2018 10:20 pm
Forum: This is SolarChat !!
Topic: High Res Chromosphere at 393.4A | Aug 30th 2018
Replies: 12
Views: 294

Re: High Res Chromosphere at 393.4A | Aug 30th 2018

Thanks Marty! Really interesting to follow your CaK adventures!
by bart1805
Thu Aug 30, 2018 9:36 pm
Forum: This is SolarChat !!
Topic: High Res Chromosphere at 393.4A | Aug 30th 2018
Replies: 12
Views: 294

Re: High Res Chromosphere at 393.4A | Aug 30th 2018

Looks fine!
Are you using the new Chroma filter Apollo is referring to?
by bart1805
Thu Aug 30, 2018 10:37 am
Forum: This is SolarChat !!
Topic: New camera but which one?
Replies: 32
Views: 649

Re: New camera but which one?

Getting there! To get rid of the Newton rings you could use a tilt adapter or Atmospheric Dispersion Corrector.