Search found 429 matches

by krakatoa1883
Wed Apr 17, 2019 7:16 am
Forum: This is SolarChat !!
Topic: AR12738 - CaH
Replies: 17
Views: 170

Re: AR12738 - CaH

Yes, at max image size it's quite long, usually I try to keep it within 20ms. However the camera works so fine (low noise, no NR, insensitive to dust) that I reluctant to change it. May be next year I will consider to purchase a Basler.
by krakatoa1883
Tue Apr 16, 2019 6:00 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of April of 2019.
Replies: 4
Views: 57

Re: Sol from the 15th of April of 2019.

Very nice discs as usual, Eric!
by krakatoa1883
Tue Apr 16, 2019 5:49 pm
Forum: This is SolarChat !!
Topic: AR12738 - CaH
Replies: 17
Views: 170

Re: AR12738 - CaH

Thanks to all of you. Nice one Raf! What exposure time are you using with this set up? I imaged at 30 fps (33ms per frame), 150 frames stacked. It's one that's on my potential radar. it's a good scope indeed, not only for solar. However I think that for calcium imaging a long focus achromat would be...
by krakatoa1883
Tue Apr 16, 2019 5:25 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Why my Quark always refused to work...
Replies: 7
Views: 131

Re: Why my Quark always refused to work...

Thanks Mark, I am contacting the Italian representative of Andover to purchase the replacement. How did you mount the 25mm for using with it your Quark ?
by krakatoa1883
Tue Apr 16, 2019 3:37 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Why my Quark always refused to work...
Replies: 7
Views: 131

Why my Quark always refused to work...

Since I purchased my Quark chromosphere in 2014 I realized that it is certainly not among the best units, I have always been forced to use of heavy sharpening and contrast masks to make chromosphere details visible, and my results have always been modest. As the etalon performance in Quark units can...
by krakatoa1883
Tue Apr 16, 2019 11:55 am
Forum: This is SolarChat !!
Topic: Holiday sunshine
Replies: 11
Views: 90

Re: Holiday sunshine

Beautiful photos, Alexandra, and beautiful place indeed. Google Maps reports several museums there.

Great H-alpha, the orange version is superb! :bow
by krakatoa1883
Tue Apr 16, 2019 11:01 am
Forum: This is SolarChat !!
Topic: AR2738 from Westport today
Replies: 19
Views: 185

Re: AR2738 from Westport today

Beautiful and well processed image, Franco. Have you already tried your Quark sodium with different tunings ? just to see if it makes any difference
by krakatoa1883
Tue Apr 16, 2019 10:43 am
Forum: This is SolarChat !!
Topic: Calculating Field Rotation With an Alt Az Mount For Solar Timelapses
Replies: 3
Views: 57

Re: Calculating Field Rotation With an Alt Az Mount For Solar Timelapses

Hi Mark, for a given day and time Helio Viewer software calculates the parallacting angle of the Sun as seen through an alt-azimuth telescope (http://www.petermeadows.com/html/parallactic.html)
by krakatoa1883
Mon Apr 15, 2019 7:20 pm
Forum: This is SolarChat !!
Topic: AR12738 - CaH
Replies: 17
Views: 170

Re: AR12738 - CaH

Thanks, Christian. Yes, I am experimenting with different tunings as this is a useful feature of the Quark, for this image I set the knob at 0 while the best position would be at -5.
by krakatoa1883
Sun Apr 14, 2019 1:29 pm
Forum: This is SolarChat !!
Topic: Some Sunshine with the Travelling Kit - 13th April
Replies: 17
Views: 125

Re: Some Sunshine with the Travelling Kit - 13th April

Great images, Mark, your travelling kit is great.

When I had the same refractor I used to reduce it to 45 mm for CaH imaging, it worked fine.
by krakatoa1883
Sun Apr 14, 2019 1:22 pm
Forum: This is SolarChat !!
Topic: AR12738 - CaH
Replies: 17
Views: 170

Re: AR12738 - CaH

Thanks to all!
by krakatoa1883
Sun Apr 14, 2019 1:20 pm
Forum: This is SolarChat !!
Topic: AR2738 on a fine morning
Replies: 7
Views: 90

Re: AR2738 on a fine morning

Great image, I like how you processed it.
by krakatoa1883
Sun Apr 14, 2019 1:20 pm
Forum: SPoD Archive
Topic: AR2738 on a fine morning
Replies: 6
Views: 35

Re: AR2738 on a fine morning

Great image, I like how you processed it.
by krakatoa1883
Sat Apr 13, 2019 8:33 pm
Forum: This is SolarChat !!
Topic: AR2738 in Ca K with TOA 150 and nice details
Replies: 12
Views: 126

Re: AR2738 in Ca K with TOA 150 and nice details

Wow, Christian, this is a really stunning image, how many details inside the umbra! :bow
by krakatoa1883
Sat Apr 13, 2019 8:28 pm
Forum: This is SolarChat !!
Topic: AR12738 - CaH
Replies: 17
Views: 170

AR12738 - CaH

This spot is becoming popular :lol: notwithstanding the recent predictions for a deep and long solar minimum I very much hope to see other spots like this one. Today I succeeded to take one image with my 100ED, again between clouds with some apertures lasting enough to allow some work. Thanks for lo...
by krakatoa1883
Sat Apr 13, 2019 8:16 pm
Forum: This is SolarChat !!
Topic: AR2738 in Ha April 13th 19th
Replies: 7
Views: 68

Re: AR2738 in Ha April 13th 19th

Beautiful results, Stu, your mod works really fine. The bridge is clearly visible.
by krakatoa1883
Sat Apr 13, 2019 8:15 pm
Forum: This is SolarChat !!
Topic: Before the clouds 13 April
Replies: 13
Views: 115

Re: Before the clouds 13 April

Fine images, Maurits, well processed.
by krakatoa1883
Sat Apr 13, 2019 8:14 pm
Forum: This is SolarChat !!
Topic: AR2738 in CaK
Replies: 12
Views: 132

Re: AR2738 in CaK

Beautiful images, Bart!
by krakatoa1883
Thu Apr 11, 2019 9:33 pm
Forum: This is SolarChat !!
Topic: AR12738 H-alpha and CaH
Replies: 5
Views: 80

Re: AR12738 H-alpha and CaH

Thanks for your kind comments (grazie Franco!).
by krakatoa1883
Thu Apr 11, 2019 11:41 am
Forum: This is SolarChat !!
Topic: AR12738 H-alpha and CaH
Replies: 5
Views: 80

AR12738 H-alpha and CaH

Not much solar work these days as - finally! - spring is arrived after an exceptionally dry winter in northern Italy, and rains are now frequent. I imaged AR12738 in H alpha between clouds and in strong winds with storms developing around here, considering these conditions I am not too disappointed ...
by krakatoa1883
Thu Apr 11, 2019 11:24 am
Forum: This is SolarChat !!
Topic: Region today 11 April
Replies: 14
Views: 165

Re: Region today 11 April

Impressive images, very good work!
by krakatoa1883
Thu Apr 11, 2019 11:23 am
Forum: This is SolarChat !!
Topic: Double stacking !!!!
Replies: 3
Views: 85

Re: Double stacking !!!!

I sometimes stack my Quark with my Lunt PT-modified achromat and even with the small Lunt 50. It works depending on the matching between the tuning of both filters. In cold weather my Quark is difficult to tune and doesn't significantly improve images.
by krakatoa1883
Thu Apr 11, 2019 11:21 am
Forum: This is SolarChat !!
Topic: Proms and spot April 9, 2019
Replies: 12
Views: 138

Re: Proms and spot April 9, 2019

Really very fine images, I like particularly the prominence, very sharp indeed and beautifully processed
by krakatoa1883
Wed Apr 10, 2019 10:42 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 39
Views: 2802

Re: Experimenting calcium imaging with small refractors

Just to point out, again, that not always a low dispersion glass can be beneficial for narrowband imaging. Here are two almost-RAW images taken of a small group appeared last March , all parameters are the same (native focal = 900mm for both scopes, same camera, focus, no. of stacked images, same ve...