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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 03 Jul 2013 (Wednesday) 13:53
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how bad is it to switch lenses while camera is on?

 
jra
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Jul 04, 2013 01:30 |  #31

dexy101 wrote in post #16088561 (external link)
How else does dust get on the sensor but when the lens is off. Do you think dust cant make it through the shutter blades? You are sadly mistaken. Dust is also attracted to electrostatic charges.

Dust will always be an issue....even if you never remove your lens. Dust exists everywhere, might as well accept it and move on to bigger and better things :)




  
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DreDaze
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Jul 04, 2013 01:48 |  #32

i never turn my camera off at all...ok...occasionall​y i'll turn it on and off to get the sensor cleaning to start


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patrick023
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Jul 04, 2013 05:09 |  #33

jra wrote in post #16089732 (external link)
Dust will always be an issue....even if you never remove your lens. Dust exists everywhere, might as well accept it and move on to bigger and better things :)

Exactly. Friction between moving parts creates dust. Every time you take a picture the mirror and shutter blades move, creating dust.


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Kronie
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Jul 04, 2013 05:28 |  #34

gjl711 wrote in post #16088834 (external link)
Page 31 of the 5D Mark 2 manual has step by step instructions. Powering down the camera is not mentioned.
Page 31 of the 7D manual has step by step instructions. Powering down the camera is not mentioned.
Page 25 of the 350D manual has step by step instructions. Powering down the camera is not mentioned.
Page 36 of the 600D manual has step by step instructions. Powering down the camera is not mentioned.
Page 52 of the AE-1 manual has step by step instructions. Powering down the camera is not mentioned. In fact, for some lenses need to be removed before advancing the film.

I'm sure every manual is the same. These are some of the ones that I have searchable.

And the post just before yours has the quote from Chuck Westfall, the Technical Advisor of the Professional Engineering & Solutions Division at Canon U.S.A where he states that the sensor never has a charge on it. Pretty clear I think.

The point is that there is no recommendation to do either. It doesn't say to turn it on, nor does it say to turn it off. This means that it just plain doesn't matter what you do. If it floats your boat to turn it off, that's just fine. Do so. If you don't want to turn it off, that's fine as well. Do that.

But when someone asks if it is ok to change the lens with the camera powered on, the answer should be yes, it is just fine, and not "I turn it off" or "I know a guy who knows a guy who said to turn it off". That info is just plain wrong. If you want to answer that it doesn't matter but I prefer to turn it off, that's fine, but don't perpetuate the web myth that the camera must be turned off to change the lens.


So the short answer is no you didn't find it, but you quoted 5 lines of pointless text that didn't say yes or no either. Chuck didnt say its fine to hot swap lenses he said the sensor has no charge. Those are to different things.

Now aren't you perpetuating the web myth that its just fine to swap lenses with the camera on? Just to suit your opinion? Its not in the manual and no one at cannon that I know of has specifically addresses it. So which one is the myth?




  
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Kronie
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Jul 04, 2013 05:31 as a reply to  @ post 16088979 |  #35

Oh, I guess it has been specifically addressed by Cannon and they recommend:

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




  
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SkipD
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Jul 04, 2013 05:33 |  #36

Kronie wrote in post #16090082 (external link)
Oh, I guess it has been specifically addressed by Cannon and they recommend:

Where is your quote taken from?


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Kronie
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Jul 04, 2013 05:42 |  #37

SkipD wrote in post #16090085 (external link)
Where is your quote taken from?

http://cpn.canon-europe.com …_image/sensor_c​leaning.do (external link)

Cannon wrote:
Prevention is better than cure

You cannot stop dust getting into your digital camera, but you can reduce the risk a little using one or more of these simple procedures.
Switch the camera off before changing the lens. This reduces the static charge on the sensor and stops it attracting dust.




  
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msowsun
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Jul 04, 2013 07:10 |  #38

Originally Posted by Cannon
Prevention is better than cure

You cannot stop dust getting into your digital camera, but you can reduce the risk a little using one or more of these simple procedures.
Switch the camera off before changing the lens. This reduces the static charge on the sensor and stops it attracting dust.

Yes, but that only applies if you are using the camera in Europe since Canon USA's article on the same subject just says to change lenses "quickly and efficiently". ;)

http://www.learn.usa.c​anon.com …_sensordust_art​icle.shtml (external link)

Minimizing Dust (in camera):

Reduce the amount of cleaning you have to do by minimizing the practices that can allow dust to collect on your sensor — changing lenses, using zoom lenses, etc. Use body caps whenever a lens won’t be attached to your camera for longer than a few seconds, and be sure the cap is clean before you put it on. Store and handle your equipment with care in as sterile an environment as practical. I carry all of my cameras and lenses in sealable plastic bags to reduce exposure to dust and moisture. Don’t be afraid to change your lenses when you’re on location, but use common sense, and do so quickly and efficiently. Good habits will reduce the amount of work you have to do — before and after shooting.


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Tommy1957
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Jul 04, 2013 11:33 |  #39

I rarely remember to turn off the camera before removing the grip, changing batteries, changing cards, changing lenses. I've never had an issue with the XSi, T1i, 60D, 5D or even my Elan 7Ne.




  
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ElectronGuru
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Jul 04, 2013 12:01 |  #40

msowsun wrote in post #16090211 (external link)
Yes, but that only applies if you are using the camera in Europe...

That European dust is way worse ;)

The issue here is that there are minimum and maximum (best) practices. You can leave the power on for lens changes and risk more dust, on for card swaps and risk corrupt data, on for battery swaps and risk whatever. But no one is telling anyone what they must do and there is no absolute right answer. If you have more time and the risk bothers you, take the extra step. If you're in a rush, no worries.

For myself, on/off is when the built in cleaner gets activated - so I will power off 3 times during a session just to get this. An old school IT guy, I don't unplug 'live drives' so off for that too. Battery doesn't matter either way, so I swap as needed. IS is more interesting. There are whole threads from folks who removed their lens to soon and are worried 'that sound' means the lens is broken. Anything that parks the IS system will prevent this. If waiting x seconds is best, wait x seconds. If the waiting technique is tricky to remember, shutting down the camera is more definitive.


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pwm2
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Jul 04, 2013 12:17 |  #41

KhanhD wrote in post #16088531 (external link)
You should have no issues as long as the body is not accessing the storage media at the time. This also applies to battery and card changing.

The camera detects when the door is opened and instantly try to stop any accesses - obviously this isn't good if the camera still have unsaved photos.


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pwm2
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Jul 04, 2013 12:19 |  #42

dexy101 wrote in post #16088561 (external link)
How else does dust get on the sensor but when the lens is off. Do you think dust cant make it through the shutter blades? You are sadly mistaken. Dust is also attracted to electrostatic charges.

So you suggest to connect the new lens before removing the old lens - just so the camera body is never open?

Camera on or camera off - you still need a number of seconds with the camera open while switching. The question is: will the amount of dust differ if the camera is powered or not.


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pwm2
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Jul 04, 2013 12:21 |  #43

prrs4me wrote in post #16088792 (external link)
When i sent my camera in to Canon to have my sensor cleaned, the representative told me to always switch the camera off when changing lenses. I didn't do it before but I do now. It's a simple and quick enough thing to do. Whether it makes a difference or not I don't know.

A Canon representative isn't the same as a technically knowledgeable person.


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pwm2
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Jul 04, 2013 12:29 |  #44

I never turn off the camera (since I can't - it doesn't have any power switch).

But I sometimes play with that "on/off" switch when I want to make sure that all controls should be deactivated.

The electrical contacts are designed to connect the different pins in sequence to make sure that ground, power and signals gets connected in a safe way for the camera and lens.

The pins for a CF card are also designed to connect ground/power/data in sequence, to allow safe hot-plug. For SD cards, the contacts that interfaces with the card have a different offset for the plus and ground compared to the rest of the pads. So supply voltage will be connected before the data lines.


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amfoto1
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Jul 04, 2013 22:51 |  #45

In around 12 years using them, I've never turned off my Canon to change lenses or memory cards or batteries.

I do make sure either the camera or the flash is turned off (or in sleep mode) before mounting a flash in the hot shoe. Just a precaution. Tho I've never had a problem with a Canon, I have had other flashes short out or misfire on other cameras, when sliding them into the hotshoe.

WIth later model Canon, I do try to turn them off and on occasionally just to insure the sensor cleaning cycle runs.


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