I shot these pictures with my Leica M6 TTL, the lens Noctilux, the flash Leica SF 20 , and film Kodak Portra at speed box. The great thing about this combo is that the flash is TTL compatible which means that the light meter takes into account the ISO, the shutter speed and the light coming “through the lens” . In the viewfinder a “thunder” symbol appears, that indicates that the flash is well connected. The internal meter of the camera will take everything into account and will guide you to get the perfect exposure. You’ll find it by playing with the aperture until the green light is on. Just as an external meter would give you the right aperture in a studio when you fire the flash for testing.
The big challenge is the compulsory shutter speed you have to use : 1/45s . Faster than that, the flash doesn’t fire. But finally, I managed to keep my hands steady and the pictures turned out sharp. I think the flash is really necessary when you shoot models indoors, because it lifts the shadows and make the image brighter without pushing the film. Besides, with color film, you don’t take too much risk with a flash because it can handle overexposure pretty well in case the TTL function doesn’t do its jobs perfectly enough. All in all I’m very happy with the rendering and I think the pictures look really nice.