[Todo43 (Lachlan)]

Hi all,

Another problem to do with the ASI Air I think. I have finally managed to get guiding going and I now understand the problem (it's a whole thing). So last night, I took my flats after my imaging session, after watching the focus positions (ZWO really needs to make it an option so that you can see your previous focus points). I averaged the positions, took the exposures, came inside, pre-processed the images, and got a result. It is attached. I've only made the background better and stretched it so that you can all see. I've also attached an image of a single flat frame that was produced from the ASI Air.

I'm wondering if these flats are over compensating? Or under compensating. I don't know how to get rid of the weird vignetting thing at all and I don't think it has happened to me before.

I'm using a ASI533MC Pro with a 2.5" Flattener on a Sharpstar AL-90R. I don't think that it is normal vingetting because the sensor is way smaller than the image field.

Any ideas anyone? Thanks!