Reciprocity failure in dSLR's?
I have a K-5 and I love it's ability to take low-light shots at fairly high ISO speeds. It is a very good camera for low-light handheld work. But I started wondering, do modern dSLR's like the K-5 suffer from reciprocity failure at long shutter speeds? As a long-time film photographer, we always had to compensate for reciprocity failure when shooting film with long shutter speeds, and I wonder if this still affects dSLR sensors.
For those that do not know what reciprocity failure is, it's when you reach a certain slow shutter speed, such as 10 sec, in order to add one more stop of exposure, you must increase it more than a stop. For example, starting from my 10 second example, 20 sec would be one stop more exposure but when shooting film, you would have to increase the shutter speed to 30 sec in order to achieve one stop more on film. The film loses sensitivity as longer shutter speeds are used.
I haven't yet done many long-exposure shots with my K-5, so I figured it would be easier to just ask!
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