Sound of shutter
The way a leaf shutter sings, can tell you how healthy
Synhcro Compur (Hasselblad Distagon 4/50 Nr 5772718)
This Distagon was years unused and the shutter became sticky.
Exposure time was set to 1 second. A small microphone was
attached to the lens and the shutter
was released. The sound
was recorded by Cool Edit software via a sound card.
The image displays the waveform.
The horizontal axis tells time in seconds. Notice
the 1 second exposure time was actually almost 15 seconds. Click the image
to listen the stuttering sound of the shutter (file size 318 KB).
the shutter was
cleaned and lubricated by a professional service
person and the experiment
was repeated. Click the image to listen the smooth
sound (file size 27 KB) of properly functioning shutter.
This is also Synchro-Compur (Sonnar 4/150 Nr 2552525), which was
serviced about a year before recording the sound.
This is Compur
made in 1936. It was serviced about
a year before before recording the sound. 1 second is
actually 1.5 seconds, which can be forgiven because of it's age.
This is Japanese Petri Carperu MXV. Actually it is not
noisier than Compurs, but because there's no peak sounds when
the shutter opens and closes, it was possible to record it
louder. It has interesting "tail".