I made this super cheap video assist from a camera I'd bought a little while ago but thought didn't work (not sure why). The cameras are on sale for a little less than $8. They are light enough for gaff tape to hold them on to the viewfinder (at least until you find a permanent solution) and they are good enough for framing for sure.
This was on a Rex 5 with 13x viewfinder. I will try it on the 10x tomorrow.
I think they have some kind of automatic gain which really does help make it brighter than the Bolex viewfinder would ever be to the naked eye. But the image is also not that great under normal household light but one wouldn't be shooting under those lighting conditions I would hope.
You can see more photos and ready about it more here: http://www.threewest...x-video-assist/
You can get the cameras here while they last (looks like they also have the same ones for less than $7 too if you look at their inventory) : http://www.ebay.com/itm/291002399506
I have a 1k Bambino with diffusion in front going on there so the edges of the video view can be seen. It doesn't zoom in enough to be edge to edge though. The lens is 3.5-8mm. I'm not sure how this will look once in a real world situation where you'll have the lens stopped down for the best exposure. I'm sure I'll find out soon enough.
Edited by T Sanders, 24 December 2013 - 09:11 PM.