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.

Very nice discs as usual, Eric!

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...

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 ?

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...

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

Great H-alpha, the orange version is superb!

Beautiful and well processed image, Franco. Have you already tried your Quark sodium with different tunings ? just to see if it makes any difference

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)

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.

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.

Thanks to all!

Great image, I like how you processed it.

Great image, I like how you processed it.

Wow, Christian, this is a really stunning image, how many details inside the umbra!

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...

Beautiful results, Stu, your mod works really fine. The bridge is clearly visible.

Fine images, Maurits, well processed.

Beautiful images, Bart!

Thanks for your kind comments (grazie Franco!).

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 ...

Impressive images, very good work!

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.

Really very fine images, I like particularly the prominence, very sharp indeed and beautifully processed

Great images, really impressive

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...