When I take night sky images I generally try to include a nice landscape in the foreground. I mostly use a 15-30mm F/2.8 lens with a star tracker to get 3-4 minute long exposures of the night sky.
I recently found a very nice scenery where I want to take an image. I want the horizon line to be on the lower third of the image to concentrate the view on the sky. However my shot would include some trees in the foreground which would look like they are leaning back since I need to point the camera a little bit up.
My friend recommended me his 19mm tilt shift lens and I would be curious to try it out. Is there anything I should be aware of when shooting with a shifted lens on an astro tracker? Normally I put the tracker in the right orientation and shoot in whatever direction I want to.