First Post.  Just starting out with Astroberry.  Before spending too much money, I'm using my existing Nikon D200 and a camera lens.  I'm having minor issues.

1. When I set the Image setting to NEF (Raw) and transfer mode to Native, the preview is always stretched even though I've turned off Auto Stretch.  This does not happen if I change to JPEG Fine.  As I have no live view, I want to use the preview for alignment, but there are too many stars and noise in the stretched image to do this. 

2. If I set the Image setting to NEF (Raw) and the transfer mode to FITS, I get the error "Cannot open ... Unsupported file format or not RAW file.  Are NEFs not supported?

3. Really minor issue, first preview after loading the software is always a 20 second exposure regardless of what I set in Ekos.  Is this normal?

Using Astroberry on Pi4
KStars 3.5.2

Mike