Hi Rainer,
I had shortened the tube so as to work with my PST mod,plus the scope originally had a 1.25" focuser but managed to adapt a 2" job to fit
Alun
Hi Rainer,
Maurice told to me that he developed a special Photoshop process to display the Helium image. He writes:christian viladrich wrote: ↑Wed Jun 14, 2023 9:35 am The D3 image is probably one of the best I've ever seen!
Reading some of Peter Zetner's old posts, he suggested that the 'professionals' divide the He frame by the continuum frame to obtain clear He distribution information. I did this but the result was rather duo-tone and pretty horrible.
Looking at Christian Buil's tutorial he suggested 'subtracting' the continuum image from the He frame and then stretching the result. This was better but still not great.
I then played around with some of Photoshop's layering methods (including 'difference' and 'subtract' combinations with different 'fill' levels). Results attached (my favourite result, helium D3 ps diff method2).
I had a very good imaging session on Sunday morning for a couple of hours and managed some data in five different wavelengths. It is interesting to see the differences between the images. Numbers of scans used for each image is within file name.
I was surprised to pick up some prominence activity in the Na D2 data as I had not observed them there before.
The continuum image was from a 50 pixel (approx. 5 angstrom) shift towards longer wavelengths from the Ha line.
Maurice
See the very first sentence of the beginning of this post.