Ooh yes, for low light I am currently making a camera using the intensifier from an old night vision periscope from a Ferret armoured car. More info here - the site of the chap I purchased it from. It's Gen I, cost was £100 but it is FAR better than the commercially available stuff - for visible light it is as good as a Gen II unit. It also has large input and output windows so as you can see from the pics in the link it can be used with 35mm lenses.

Gareth