Stars are very far away... at least a mile or two
Set for hyperfocal and you don't even need to look through the view finder.
Also, if you're really into this type of work I suggest an Astrotrac mount. You'll never need to worry about star trails, unless you want them. A little pricey but it weighs so little, it's easy to setup and pack for travel... the results are superb! It's also great for time lapse work.
I had a Losmandy Starlapse set up but it weighed a ton and took a bit to set up, eventually sold it and went for the Astrotrac.