dlmorris wrote:
But I think his question is....and mine also....can you see the stars in order to focus or frame using an EVF?
Yes.
For example, my D3300 has a + zoom button to zoom in, and - zoom button to zoom out, in Live View. (They work for reviewing picture files, primarily. But in Live View, zooming.)
I found it best if I set my Camera display to its dimmest setting. That way your eyes aren't being blinded by brightness.
So for a specific camera, that would be something to look for.
When starting out, I read somewhere that when focusing, the Moon is your friend. The Moon is a very bright object to begin learning your focusing at night.
There are several settings to turn off so they don't interfere with your use at night. Flash (obliviously), and other automatic functions trying to adjust the camera to things it was not intended to do, stars. Camera manufacturers are more in tune to folks taking pictures of terrestrial things, not interstellar. So they do things like matrix's to enhance the colors found in sunlight. It makes it tricky to work around those, but it's doable.
If I can do it, I should think it would be reasonable for folks with a real brain. I'm an Ameba.
I found I could tap a wealth of information on YouTube. I love this kind of mining!
https://www.youtube.com/results?q=Using+an+Electronic+Viewfinder+camera+to+take+pictures+of+starsEntering the specific camera into the search helps follow more specific titles.
https://www.youtube.com/results?search_query=Using+a+D610+Electronic+Viewfinder+It's easy to get lost in the results.
Of course, my camera is very much a beginners camera, cropped sensor, very limited in several functions. But not knowing any better, I forged ahead anyway.
Manual settings are your friend, and longer exposures, and higher ISO settings.
Experimenting is fun.
As always, Your Mileage May Vary.