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09-27-2011, 05:04 AM   #31
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QuoteOriginally posted by kh1234567890 Quote
Is this yet another internet myth in the making ?

Why should the inert outer face of the low pass filter attract more dust when the camera is turned on ? The worst that might happen is that the comms between the camera and the lens gets screwed up.

Beside, peering down the lens opening of my K-7 it seems that those clever Pentax guys have built in this handy retractable metal cover over the sensor ...
Canon Professional Network - Sensor Cleaning

"Switch the camera off before changing the lens. This reduces the static charge on the sensor and stops it attracting dust."

Getting Started: How to Change a D-SLR Lens from Nikon

"Again, make sure you turn the camera's power off before changing the lens as the image sensor itself generates a static electric charge that can attract dust."

But anyway I think the real reason for doing that is to prevent shorting the electrical contacts at the lens mount. Most of the time I do power the camera down, but sometimes I forget.

09-27-2011, 05:32 AM   #32
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QuoteOriginally posted by darrenleow Quote
Canon Professional Network - Sensor Cleaning

"Switch the camera off before changing the lens. This reduces the static charge on the sensor and stops it attracting dust."

Getting Started: How to Change a D-SLR Lens from Nikon

"Again, make sure you turn the camera's power off before changing the lens as the image sensor itself generates a static electric charge that can attract dust."

But anyway I think the real reason for doing that is to prevent shorting the electrical contacts at the lens mount. Most of the time I do power the camera down, but sometimes I forget.
Presumably you should then prop up the mirror and shutter with matchsticks while in the 'sensor cleaning' mode and take the battery out, otherwise all the dust in the world would be instantly attracted to your antistatically coated low pass filter surface, defeating the procedure
09-27-2011, 05:33 AM   #33
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I know next to nothing about electronics so I ask out of curiosity: does this static charge dissipate so quickly that turning the camera off immediately before removing the lens makes a real difference?

Also note that you have to power the camera up to clean the sensor, so (re shorting the electrical contacts) I would hope it is safe to have the power on with the lens off. [Edit: a minute too slow with that one!]

Last edited by baro-nite; 09-27-2011 at 05:34 AM. Reason: addendum
09-27-2011, 09:21 AM   #34
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I power-off when switching lenses mostly as a CYA routine. Switching back on, the sensor shakes-off its dust; if it's a manual lens, I get to tell the SR'bot its FL; if it's an AF or A-type lens, an F-- tells me to check the A-ring or contacts. It's rather like doing a minimal walkaround of a vehicle before taking off: the power-up establishes that things will or won't work somewhat as expected. No big deal. And no paranoia about static cling. Hay, maybe we need to keep laundry anti-static tissues in our mirrorboxes!

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