TtV
Through the viewfinder is a technique that takes 2 camera's to produce ONE image.

The camera's are joined via a long black tube - to keep out unwanted light. the top camera is then used to take a photo thru the viewfinder of the bottom camera, often a twin lens reflex- (they have nice big view finders).

The results are varied but usually end up some what gritty with soft vignetting.

You can find out more here
www.flickr.com/groups/throughtheviewfinder/

Enjoy
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