Has anyone ever made their own light meter?

That never even ocurred to me...what a great idea!

"Why are screwing around with an external meter for your Holga. With a little modifications, you could put one inside your camera."

With a Holga there wouldn't be the problem you would normally have with a between-the-lens shutter when trying to meter TTL. You could calibrate the meter to read TTLL: through the light leaks.

Best,
Helen

LOL Helen, the scary thing is that that might actually work.

Though, to be honest, I have a new Holga, and it's remarkable light-leak free. Of the two rolls (24 shots) that I took in New York last month, only two frames have leaks.

Though, anyway, making your own TTL meter sounds like a pretty good idea. I actually might buy another Holga and try to build something in. obviously, TTL isn't going to work well due to its design. Though due to its spirit of imperfection, something could be placed near the lens or viewfinder on the outside of the camera, with the electronics squeezed in underneath one of the frame masks; just put the LED right up to the viewfinder.