prob with changing lenses

[mazzthenewbie]

hi all i have a cannon eos 1000d
when i was on Holiday (in Egypt/Jordon if that helps) and changed my standard lens to my telezoom lens (both cannon) the camera would only restart when i took out the battery and reinstalled it any body got any ideas

[PaulMontgomery]

Sounds like a brief electrical glitch. Was the camera turned on when you changed the lenses? Does it happen all the time? If so I'd check the contacts between the lens and camera - do they look dirty?

[ianpinion]

Hi Mazz,

Welcome to the forums.

When you changed lenses, did you remember to turn the camera off first? It sounds as though you didn't. It's good practice to do this otherwise when you remove one lens there is still a small electrical charge on the sensor and it can pull dust towards it and the contacts.

The other tip is to keep the camera pointing down towards the floor, again to minimise the amount of dust that could blow inside the camera.

[anglefire]

There is no charge on the sensor unless you are actually taking a picture or using live view. (Confirmed by Chuck Westfield in one of his monthly newsletters ages ago.)

For years I never turned my 350D off - never had a problem and the dust problem was no worse than anyone elses.

However, there is a good reason for turning off todays camera's - if they have the sensor dust shakey thing set to work on startup-shutdown.

[chris-p]

Originally Posted by anglefire

There is no charge on the sensor unless you are actually taking a picture or using live view. (Confirmed by Chuck Westfield in one of his monthly newsletters ages ago.)

I don't know who Chuck Westfield is but he's wrong. If the power switch is set to on then there will be some charge trickling to the sensor unless the camera is at absolute zero - it's the laws of physics. Whether it's enough charge to attract dust it's difficult to say - probably not.

I have always been told it's good practice to turn the camera off when changing lenses (and I do) but I've never had a decent explanation for why!

[ap4a]

Originally Posted by chris-p

I don't know who Chuck Westfield

He works for Canon USA as the technical advisor for the consumer imaging group.

[nikonian]

With the small voltge in the camera there is no chance of an electrostatic charge, This only happens in very high voltage appliances ie a TV set. Just remember when you change a lens the contacts of body and lens rattle over each other, but no probs.