Question about Canon EF 70-200mm f/2.8L USM Lens

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Lens will not connect to camera body

My 70-200mm lens will suddenly not connect to camera body (mark II) it was working fine, then I switched lenses and when I tried to re-connect it again it would not slip on easily and would only have attached if I had forced it. I know how to put my lenses on (pro) so thats not the issue :) Any ideas what could be up? Thanks!

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If one or more of the screws that hold the mount are loose, that could cause that problem.

Posted on Dec 07, 2009

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1 Answer

How to fix err 01


you have a faulty connection between the lens and body of the camera
  • remove the lens clean contacts on lens and the body of the camera
  • remount the lens
  • if you still encounter the error turn off the auto focus switch .
  • take a test shot (manual focus)
  • if you did not encounter the error your lens might have a faulty flex cable have it checked / replaced at the service center

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One side of the reverse adapter has a 67mm thread, the other side has a lens mount. Mount it to the camera body as if it were a lens. Bear in mind that it's intended to screw onto the front of a lens and then mounted onto a camera to put the lens onto the camera in a "backward" position.

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I got new Sigma 18-200 DC II lens, with Canon EOS 5D Mark II it has black lens frame is visible through viewfinder or on the photo. Does it mean this lens is not compatible with 5DmrkII?


The EOS 50d Mark II is what's known as a "full-frame" camera. Its image sensor is the same size as a frame of 35mm film. The Sigma DC lens is intended for cameras with smaller sensors. The lens is compatible in that it will work with the camera to take pictures, but the pictures are cropped due to the smaller imaging area of the lens.

In order to use the full image sensor area you need to use full-frame lenses. In the case of Sigma, this means lenses without the DC designation.

Aug 03, 2012 | Cameras

1 Answer

I have a Minolta Maxxum 5D which I really like. I take a lot of pictures outside with my job. I have a telephoto lens and a regular lense as well. I switch lenses a good bit depending on the shot. ...


It can occur if the contacts on the lens where they meet the contacts on the camera body need cleaning. Try a cotton swab lightly dampened with rubbing alcohol.

Aug 11, 2010 | Konica Minolta Dynax 5D / Maxxum 5D Body...

1 Answer

I have got an EOS Elan II E Film Camera (Cannon). I want to know Cannon has camera with a digital body which suits the lens attachment of EOS Elan II E.


Hi, all canon EOS digital cameras can take all EF lenses. An EF lens from 1989 will fit a Digital body from 2009.
The newer EF-S lenses will only work with the smaller APS-C size sensors on the cheaper consumer bodies.
Hope this answers your query, please take the time to rate!

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1 Answer

AV error whn pentax ist DL & Quantaray zoom lens attached


I've got the same problem. The problem is that the lense is loosely attached to the body. What you need to do is that when you see the Av flashing, press the lense of the camera to the body and twist the lense to the left a bit. This tightens the connection. You can then take the photo.

Feb 20, 2009 | Pentax *ist DL Digital Camera

1 Answer

Nikon d40


make sure you are using lenses with built in motors. not all lens type work with the d40 as the camera does not have a motordrive in the body.

Oct 07, 2008 | Nikon D40 Digital Camera with G-II 18-55mm...

1 Answer

Lens will not zoom in or out


Brush off any lose dirt from both the lens and bayonet mount and the autofocus drive shaft . If you are still not getting camera to auto focus your lenses have an expert look at the body : this is not an expensive problem to repair on these Pentaxes either a small mechanical problem or the connection to the pc board is bad. In either case only the front of the camera has to be dismantled ( +- 1 hour of labour to do the whole job ).

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1 Answer

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There was a lot of discussion of this when the Mk II was new. Many people "fixed" it doing just the things you did. Also, some reported that mounting the lens on another camera "fixed" it. IIRC, in the end it ended up being a lens issue. IS module. Canon can repair.

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