View finders aren't something you see much of. It's a rangefinder sort of thing. New rangefinders have lines indicating the view of different focal length lenses but old rangefinders only showed what a normal lens saw. For anything else an external view finder is necessary. I've been using the Soviet built Zeiss copy KMZ Universal Finder which has finders for 28mm, 35mm, 50mm, 85mm, and 135mm lenses. They can be had for $40 to $50 where new finders for a single focal length are between $100 and $200.

The KMZ works pretty well but I've been liking the results from my 35mm Jupiter 12 and have been looking for a dedicated 35mm finder. I found a Swallow 35mm view finder on eBay for under $23. I've never heard of this brand. It's made Japan. It arrived a few days ago.

I don't think I've seen a view finder this large. It's like looking through a picture window. It's on a spring and the little lever moves the front up and down for parallax adjustment. The FED is wearing this setup most of the time now.