Notes:
It's a shame when
you have more than one lens for a DSLR camera. It means you might
have to change the lens from time to time. I am changing mine on
a typical day of shooting 3-4 times and the result is a build up
of crap on my sensor. I am very careful about how I swap the lenses
over, always making sure the body is turned 'OFF', point the camera
(wirth lens mount) pointing down between changes and ensure it is
done within a few seconds. I understand that in swapping lenses I
am exposing the mirror and sensors to the elements.
The dirt only becomes an issue with the Canon MP-E 65mm macro lens
unit or when there is a lot of sky in the frame. It becomes really
noticeable at high F numbers.
With other lenses such as 100-400 zoom the dirt on the sensor/image
does not bother me too much, it's hardly noticeable, the dots are
not focused and appear to blur out of view.
So far I have just been using a small hand-blower, directing blasts
of air into the lens mount towards the mirror. I am scared to do
anything else for fear of damaging the sensors. |
