one more time canon 100-400 IS

[adrian mandea]

thank you very much for the tip,i'll do that .i know the IS is not supposed to work in this case that's why I think is not working well.my lens was made in 2006 so maybe it is an old tipe of IS, i don't know.it's true that the weight factor counts a lot in this case, the lens is HEAVY,is not fair to compare it to the 70-300mm IS which is very light and easy to use, but I still think the lens can do better.


thank you all for the advices





adrian mandea

[Sinh Nhut Nguyen]

Keep in mind that you're shooting with a 1.6x crop body, so 400mm is actually 640mm.

[adrian mandea]

I don;t want to create a new topic so I'll ask this here:


how is the IS mode 2 on the 100-400mm L working? I know it's for panning and it will correct the vertical movement but what about if I shoot in portrait orientation? (I know is not usual to do so but never know) will it work or will it just ruin my pictures?





thank you

[neuroanatomist]

The short answer is that mode 2 IS works for panning with the camera in either the landscape or the portrait orientation.


The long answer I'll copy from a [url="http://www.openphotographyforums.com/forums/showthread.php?t=1919]2007 forum post[/url] by Chuck Westfall (the person who write's Canon's TechTips newsletter):
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<div class="posttext"]Every Canon SLR lens that has an Image Stabilizer built in has two so-called "gyro sensors" oriented at right angles to each other. With this design, the level of IS functionality is the same whether the camera is in landscape or portrait orientation. When the camera is in portrait orientation, the level of IS functionality is the same whether the hand grip of the camera is on the top or the bottom.

In all of these cases, IS lenses that have a Mode 2 setting operate as follows when Mode 2 is selected: Both gyro sensors sample the direction and amplitude of lens shake simultaneously and continuously whenever the IS system is activated. The resulting data is analyzed by a dedicated microcomputer in the lens, and that microcomputer in turn controls the behavior of the electromagnets surrounding the movable optical components of the IS lens. These electromagnets are also oriented at right angles to each other. If the lens is set to Mode 2 *and* the microcomputer determines that intentional panning is taking place, it shuts off stabilization in the panning direction regardless of camera orientation. If, on the other hand, the microcomputer does not detect intentional panning, then horizontal and vertical stabilization is executed simultaneously, just as it is in Mode 1.

Canon anticipates that in most cases, the camera and lens will be held either horizontally or vertically, in order to keep horizon lines straight in the resulting picture. In such cases, the typical behavior of the IS system is covered by the explanation above. If, on the other hand, the panning direction is diagonal with respect to the orientation of the gyro sensors, and Mode 2 is selected, there is a possibility that the level of panning detected by each gyro sensor will be sufficient to cause the microcomputer in the lens to shut off stabilization in both directions at once. Since the decision to shut off stabilization in Mode 2 is made by the microcomputer, there is no overt way for the photographer to control it.

Let me know if this helps to answer your question.

Best Regards,

Chuck Westfall
Director/Media &amp; Customer Relationship
Camera Marketing Group/Canon U.S.A., Inc.</div>
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[adrian mandea]

thank you John ,you really know everything.see you at the next question...I hope

[neuroanatomist]

LOL. I think you mean Daniel Browning, but thanks anyway - mostly, I just know how to use Google... []