Question about Canon Zoom Telephoto EF 100-400mm f/4.5-5.6L IS (Image Stabilizer) USM Autofocus Lens

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Lens stops functioning

Lens arbitrarily stops working for temporary time frames. aperture display becomes "00". shutter display is frozen. stabilizer becomes erratic with large amplitude motions. sometimes camera battery icon shows empty. shutting off the lens stabilizer and/or the lens autofocus doesn't help. camera is canon A2 (film), this doesn't happen with other lenses. problem sometimes disappears after lens is removed from camera and re-attached, can then re-appear. recently the lens PCB was replaced, but phenomenon re-appeared.

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Have you tried this same lens with other cameras? Do you have another camera body you can try? or perhaps a friend with a Canon EOS Camera? Also try the following please: Remove the lens. Look at the lens mount contacts, take a Cotton swap with some rubbing Alchol & clean the contacts very well, both on the lens and the camera body. Is your camera reading the lens aperture range correctly (at least most of the time)? Also since you replaced the PCB on the lens, isn't it under warranty? Let me know if this works. Thank you, AJ.

Posted on Sep 21, 2007

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On a film camera, the internel electronics determine the shutter speed and aperture. The camera computer figures out a higher shutter speed against the aperture speed. You have a lever on your lens that, when mounted on the camera, will keep the aperture open until you fire. That allows viewing in the brightest light. Then that aperture arm is allowed to close to what the exposure setting the camera determines when you click the shutter. You should be able to take off the lens and easily move the aperture arm and have it snap closed. If it takes a few seconds to close.. then the lens has oil on the aperture blades or the grease inside the lens is bad. These days, unless is it a very expensive lens it's replacement time. Canon lenses will fit any Canon (except Fd) film or digital camera.

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For use on a non-Hasselblad camera, can I use the aperture preview button (which locks) to set aperture?


There is no communications between the camera and lens. When using a set up like this everything becomes manual and you must remember to stop down the aperture to your taking aperture before releasing the shutter. I don't know what camera or format you are going to use this lens with but assuming it is a digital "bridge" (a camera that is between an amateur and a pro) or a professional the sequence would be the same.
To view, focus and compose the lens would be set in this case F2, to select the correct light meter reading the lens is set (stopped) down to the taking aperture. The modes I've used for this have been mostly manual but lately I found that "AV" worked equally well and the camera metered to the proper exposure. Most times the camera was mounted on a tripod and the shutter was released with a electronic shutter release.
Sequence for taking a photo for me anyway was/is (with the camera mounted on a tripod) focus, compose, stop down to taking aperture, check metering and release the shutter if in AV mode or manual mode to set the shutter speed and release the shutter.
You will find that all makes of digital cameras will function differently so what sequence works for one won't work on others. This meaning I have had digital cameras that wouldn't meter through anything other then the lenses meant specifically for them.
Problems that I've had. Forgetting to stop down to taking aperture (like Duh), not fine focusing (manual), not trusting the in focus indicator, forgetting that the viewfinder is/was only 94% of the scene. Once a little time has been spent with a lens set up like this the rewards are far beyond the trivial annoyances. Have fun with it

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At the time of photo taken in zoom please instruct me actual shutter speed & exposer in which better photo is taken pranab


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1 Answer

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Quite right too. When the M42 adaptor is fitted there is absolutely no exchange of information between the lens and the body: M42 lenses pre-date all of those later developments. Your camera will also be unable to stop down the lens automatically when taking the picture, most M42 lenses don't even stop down automatically when connected to an M42 body.

You need to do things the old-fashioned way. Your camera needs to be set to meter manually, shutter priority mode may also be used. In manual mode you focus the lens as normal with the aperture ring set to the lowest aperture number (i.e.aperture is wide open).
You then make sure that the lens in in manual mode as well and stop down to whatever you want, if the image remains bright enough then you can adjust the precise focus using the hyperfocal principle if you like which takes advantage of the increased depth of field of a stopped down lens.
In manual mode, you then tell the camera what aperture you have set (read it from the lens barrel) and set the shutter speed using the camera's light meter to guide you. If using shutter priority mode then the camera will choose the shutter speed for you.
Check everything is set as you intend and press the shutter.

It all sounds long winded but is exactly how many of the world's greatest photos were taken and soon becomes second nature. You also learn far more about the relationship between aperture, shutter speed and ISO settings and will be able to talk about reciprocity like you know about it!

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aperture 00, that means the body don't identify the lens, or there is no lens. try to see if the lens contacts are in order. Try another lens, par exemple you can go to a shop and try the most beautiful lens you ever seen for free.

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something sounds strange about this. aperture 00 is an invalid aperture value. stands to reason if that is the case the camera would complain about it. via error code. being that its only six mos. old i would give canon a ring.

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The USM engine may be out of order, or there is a bad contact in the lens.

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Try it on bulb, and open the f and check it is working properly the problem might be the computer inside the camera and there's no replacement spare parts, but yoou canfind another ody and swap the computer.

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