Yes, Metrocase is the company who designed a 3D printed viewfinder using a optics from a Canon OWL. A link to the Shapeways printing services is at the bottom of the link below. Note that there are two parts that need to be ordered, the base and the top cover, plus the optics from a donor camera.If you can find an old Canon OWL camera, you can take out the viewfinder elements and there is someone who 3d prints an enclosure for them that only costs like $25. Basically you end up with a cheap HUGE brightline finder.
If you need a VF for 50mm coverage only, a wonderful finder is the Kontur35 from Voigtlander. Despite its name is for 50mm ONLY. It gives 1 to 1 viewing, keep both eyes open. You see a projected frame with parallax markers floating on a field of view unimpeded by any boundries! I have one (no, it is not for sale!) and it surpasses any other auxilary viewfinder I've ever seen. On my Contax IIa it is revelatory.
Funny that , I bought it for use with a 35mm lens .
I'll have to put it on an SLR with a 50mm lens on to convince myself !
After developing the film a month or so after shooting the film you tend not to notice .
There is also a 6x9 version, which I have. What the difference between it and the 35mm variety is, I have no idea, as both are 3:2 ratio. It's close enough to 50mm that I use it on 35mm cameras with an Industar 55mm, and have yet to chop a limb off.Kontur finders came in several versions. The most common marked "35mm" is indeed for 50mm lenses on 35mm cameras. But there is a "wide" version of this finder marked "f=35mm". Hard to find, but they pop up on Ebay every once in a while. This is an example
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