Forum: Pentax DSLR Discussion
12-21-2017, 03:49 PM
|
|
Much like having a vertical traveling focal plane shutter which has a small slit but traverses the film (using old tech for this example) over a long period of time. Each section of the film would be exposed for a short time (e.g. 1/1000 s) but the top of the frame would be exposed long before (or after) the bottom of the frame. You get high effective shutter speed but poor time correlation between different areas in the frame. Mechanical shutters still have that problem but there may be only a 1/250th of a second difference across the frame with modern FP shutters. As in the case UncleVanya mentioned, 1/13th of a second is much more significant in the case of moving objects.
|