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Canon 1dx with canon 300mm f2.8L and canon 2x extender iii issue

Started 8 months ago | Questions thread
OP JohnGillity New Member • Posts: 18
Re: Canon 1dx with canon 300mm f2.8L and canon 2x extender iii issue

Having spent an hour or so swapping lenses (70-200 f2.8 iS ii and the 300mm F2.8 IS ii) taking a series of frames with each on the 1Dx plus Canon 2x iii, then checking the EXIF data for Micro adjustment info I found the following. If the aperture of either lens is set wide open ie F2.8 ( showing 5.6 due to 2x extender) then the micro adjustment data is missing more often than not from the first frame. If the aperture is closed down one stop or more then the data is recorded. and if the aperture is then set back to F2.8 without turning the camera off the micro adjustment info appears when viewing exif via DPP.    No idea why this happens but it does with both lenses.

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