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Some odd artifacts in my image
I have managed to get some data on NGC6334 (Cat's Paw) in narrowband. The issue that I have is that when I have calibrated and stacked the SII and OIII data in PI, there is a quite average looking pattern through the image. The Ha data doesn't show this. If you look at the 2 images attached it is quite obvious. Ha consists of 10x5mins and the SII image attached is 16x5mins. Data captured with SBIG STT8300M, Baader NB filters, Stellarvue SVR102T IS scope at f7.5.
Calibrated with darks and flats and all stacked in Pixinsight. Stretch applied with HT and noise reduction done with Multiscale Linear Transform before that.
The "hatching" pattern I am seeing in the data is evident all through the process. I assume it is not due to any issue with the capture as the data was collected over 2 nights and is evident in the SII and OIII on both nights but not in the Ha.
Any ideas?
Malcolm
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