Interesting, Mark.

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Nice set of images, Marty. Good to see a bit of activity at last.

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Very nice images, Raf.

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Good to see you’re getting some Sun, Dave. Nice images.

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A full set of beautiful images, Pedro. The Sun is just so devoid of any features in all lights at the moment.

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Hi Alexandra,

I use the Basler version (acA1920-155um IMX174) to image at both Ha and CaK wavelengths. I have never seen any NRs in CaK using this camera on any of my scopes with any of my Barlows. In the case of Ha I do have to tilt the camera a few degrees on occasion to remove them.


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Nice images and setup, Bart. Looks very promising. Good luck with your further optimisation trials.

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Beautiful images, Pedro. Just clouds here.

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Excellent image, Brian. Beautiful.

As with Mark and Alexandra, I was clouded out. I got up a couple of times in the night to check, with no luck. It turned foggy in the morning just to really ensure that I didn't see anything.

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It also depends on the wavelength, of course. CCD critical sampling calculations can be found here www.wilmslowastro.com/software/formulae.htm The calculation suggests f22 in Ha and f37 in CaK for your 11” f10, Alexandra, using the IMX174 with 5.86um pixels. To see what this looks like use the FoV c...

Very nice CaK FD and excellent prom, Dave. Off to a great start for 2019.

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Lovely hues across the disk, Eric. Beautiful image.

I looked out of my bedroom window to check the weather during the eclipse only to be greeted by fog! Darn.

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Another very fine image, Phil.

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Very nice indeed, Phil.

Lovely images.

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Looking very promising, Ken.

Nice proms.

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Nice images, Eric.

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A very nice set of images, Marty.

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Very nice, Pedro. Lovely moon images.

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Lovely, crisp, images, Eric.

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Brrrrrrrr.......fridgid. I don’t know how you cope in the cold.

Nice image and setup, Brian.

I’d love an observatory, but I have too many obstacles in the way. I have to chase the Sun from the front to the back garden around the house and between the trees as the days and season progresses.

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Great images, Pedro.

So quiet, even in CaK.

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Lovely historical shots, Bart.

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Interesting colour combo, Phil. Nicely imaged prom and spicules.

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Interesting colour combo, Phil. Nicely imaged prom and spicules.

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Nice images of a quiet Sun, Eric.

Stu.