Patent ID: 7929848

Claim:
An optical device comprising: a processing unit that outputs a driving signal in accordance with an operation of a full depression switch; a mirror part driven in response to said driving signal; a vibration detection sensor that outputs a detection signal corresponding to a detected vibration; a low pass filter that filters said detection signal in accordance with a cut-off frequency; and a controller that changes said cut-off frequency of said low pass filter at a timing when said mirror part is driven in accordance with said driving signal output from said processing unit, wherein said vibration detection sensor is mounted on said optical device without interposition of a damper member that absorbs vibration, said controller changes said cut-off frequency from a first frequency higher than a frequency of vibration occurring at said optical device when said mirror part is driven, to a second frequency lower than said frequency of vibration occurring at said optical device when said mirror part is driven, at a timing when said mirror part is driven before starting an exposure, and said controller changes said cut-off frequency from said second frequency to said first frequency before a predetermined time prior to starting said exposure and keeps said first frequency until finishing said exposure.