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At Croydon Camera House we fully understand how annoying it can
be when specks and smudges appear on every print. You may not see
anything in the viewfinder, but lurking in the sky you may find
several mysterious blotches. Unfortunately it's a problem with all
interchangable lens digital cameras and the more often you change
lenses the more chance the problem will eventuate. A simple test is
to set your camera to 'aperture priority' mode, select f22 and
shoot a part of the sky. Sometimes a one stop over exposure will
increase the chances of spotting any trouble and any sign of dust
will soon become apparent.
Manufacturers have incorporated sensor cleaning into their
product, but this only addresses a small part of the issue as it's
not only dust that poses a problem as it may combine with humidity
and become a sticky substance that when dry will permanently stick.
Rest assured it will not fall off with a little high frequency
vibration either, so the sensor needs to be washed. Pollens pose a
really big problem, along with the many other contaminates that
linger in our atmosphere. A charged sensor behaves a little like an
old vinyl record, so it's just a big dust magnet.
Most of this grime can be removed with a sensor clean and
'welded' dust sometimes cannot be removed at all. Remember too that
it's not actually the sensor we are cleaning, but the low pass
filter situated directly in front of it…it's there to act a filter
to block the infrared light. Called an anti-aliasing filter, it is
primarily made from a piece of glass…and glass, just like our
windows, becomes dirty when exposed to the atmosphere.
Check your sensor and if you think there may a problem, simply
charge up your battery and come and see us.
We can usually offer a same or next day service.