I have just come across the Kiev Alpha 16mm camera, this uses a pellicle mirror which diverts some of the image to the viewfinder. Obviously there'll be light loss and one would need to compensate for this when setting the aperture. But how much light loss will there be? About 1/3 of light loss? There’s not much information about this camera except that it was aimed at an amateur market and have found out that it’s small and light, but haven’t heard from anyone who's used one about how it performed, whether it scratched film, gave steady images and how long the wind lasts.