Spurred on by its success I tried a few more, although this time I used my Lumix digital camera. It actually is pretty tricky to get the lighting and the focus just right. The couple of TLR cameras a have (A Rollicord and a Microcord) produce viewfinder images which are really too dark. My Kodak Brownie Reflex 20 was a little better:
Here it is viewing my Varex IIa.
But I still got the best results with the WLF on my Varex. Here is the Varex IIb viewing my Zeiss Ikonta:
I think the lighting needs further work! My 'studio' set up is a little basic!:
I need to by some more powerful lights to replace my ones with home made cardboard reflectors!
I think a lot of people who are into these TTV photos make a tube with black card or something to keep stray light off the viewfinder. Maybe I will try that one day.