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Unprompted RF Lens Focus Movement

DSLR Imaging Optics
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#1 ericthemantis

ericthemantis

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Posted 26 February 2024 - 02:27 PM

Has anyone else noticed the lens on their RF mount Canon moving focus, even when in manual focus mode? I found that, even when the camera is "OFF", opening up and closing the cover for the memory card slots on my R7 causes the lens focusing mechanism to do a quick in-out motion. I have not done any imaging with my R7 yet or I probably would have noticed and been upset by these earlier than just yesterday (I've had it about 4 months). I've tried setting the lens and body to manual, auto, turning off 'retract lens on shutdown', turning off 'close shutter at shutdown', tried it with the camera on and off. always the same. Now I'm wondering what other setting changes on the camera could cause the lens to actuate when I don't want it moving even a hair.

 

I could see this messing up frame stacking and calibration frames, though everything is 'by-wire', so maybe it is going back to EXACTLY where it was before? It just started to worry me and wondered if anyone has had experience with this and noticed any degradation in your imaging work flow. My previous T5i and my current 6D mk ii don't do this. I get the little LED blinks, but that is it. No worries about carefully changing memory cards (or batteries or anything else for that matter) and maintaining the same optics settings.



#2 Catchlight

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Posted 28 February 2024 - 12:43 AM

Yes noticed the same thing on my R5 when using the internal intervalometer. It's so stupid that in order to stop an ongoing interval session you have to power off the camera, and at least on the lenses I have been using even the manual focus is controlled by power from the camera. So if you power the camera off and on it will almost always result in a focus shift. This has ruined several sessions for me.

I believe opening the card cover results in a power off and same loss of focus.




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