As I recall Sony offers a View Finder,,that fits the Hot shoe,,don,t know the price thoGreat question...
I have the 50 and is screen only with no viewfinder. I was concerned as some of the reviews I'd read stated this to be an issue. I tried it it Texas last week in very bright sun, including sun at my back, and didnt find it to be a problem. You can adjust the screen brightness up and down in order to save battery. I wonder if folks who have an issue are on a lower setting an don't realize it? I did need to turn it up from the factory setting in bright sun. Battery hasn't been an issue.