Dave for my 300D I use the right angle finder which attaches to the viewfinder and allows me to spin it around to any angle for comfort.
It also has a 1.25x and 2.5x mag switch which helps get closeup views of star points.
Then I do some test images and adjust as needed.
I'm not familure with the Pentax range though.
Also DSLR focus will be great. It's tops.
You can use it but you'll have to transfer the files across manually I think.
Cheers
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