Flats on SPA-1

[Christopher Curtis]

There's a quite obvious vignette and strange blue gradient on the left edge of a number of the previews of recent one-click observations from SPA-1 in RGB. I wonder if the flats are up to date or being applied properly.

[rob pfile]

see this thread: 

 

 

not clear that they did anything about this, but i haven't checked any SPA-1-CMOS one-clicks lately to see if the problem is still there.

 

[ERNESTO GUIDO]

Hi Christopher, Rob

The cause of this recent issue was identified a few months ago and has been fixed. It appears to have been related to the filter wheel; the filters were probably not perfectly seated. A manual homing of the filters before the imaging sessions resolves the issue. Below you can see a red filter image with some vignetting at the edge and another image with the same filter taken after homing.

Currently, a minor vignetting issue is only affecting the Blue frames. We'll investigate if using a higher-quality flat frame can address this as well.

 

 

 

 

Clear Skies,

Ernesto