How-to

Shanghai GP3 100 Reciprocity Failure Correction Tests

Reciprocity is the ability for a light sensitive material so respond equally to different brightness of light, so that a dim light for a long time, or a bright light for a short time will result in equal density of image forming on the film. Reciprocity Failure – technically known as the Schwarzschild effect –…

Gossen Lunasix Light Meters

Gossen Lunasix was the choice of professional photographers around the world for decades. Find out why they are still good today.

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