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On a Canon of Kabelfernauslöser used properly in order (remember mirror lock!) With long exposures, macro shots or other occasions where camera shake threatens to fuel - with easy printing as a single recording, at a set shooting for continuous fire, and for long exposures (Bulb Mode) as long as you press the button or push them forward, where they locked and if necessary also enables hours of recording. The cable length is limited - but sufficient for normal use completely. Who has higher demands, attacks anyway to Funkauslöser (and is investing a lot of money more).