How a Vertical-Travel Shutter Works in an SLR
Recorded on October 22nd, 2016
No matter whether you have a film SLR or a digital SLR, the shutter probably works something like this. The key is that the speed at which the top and bottom curtains travel is the same at every shutter speed. What determines the shutter speed (how long the film is exposed) is the delay between the two. It just blows my mind that this mechanism was developed long before computer-aided design was a thing.