topic Re: problems with eos r100 camera zoom and auto focus are not working. in EOS DSLR & Mirrorless Cameras

problems with eos r100 camera zoom and auto focus are not working.

chocolade130919 — Tue, 23 Dec 2025 09:07:17 GMT

at the time i bought the camera everything was working fine but since then the display preview is very blurry and no matter what mode i set it on the ring if A or M or any other mode when i press half the shutter button it's not automatic focusing. and i tried to play with the focus settings. in the A mode you can't change the focus mode.

also, i can't rotate with my hand the lens to change the zoom. and there are no buttons on the lens that i can switch between automatic and manual.

a video clip i recorded of what i have tried so far. i tried to focus close objects far objects view outside inside.

played with the settings.

Re: problems with eos r100 camera zoom and auto focus are not working.

jrhoffman75 — Tue, 23 Dec 2025 11:17:50 GMT

@chocolade130919 wrote:

at the time i bought the camera everything was working fine but since then the display preview is very blurry and no matter what mode i set it on the ring if A or M or any other mode when i press half the shutter button it's not automatic focusing. and i tried to play with the focus settings. in the A mode you can't change the focus mode.

also, i can't rotate with my hand the lens to change the zoom. and there are no buttons on the lens that i can switch between automatic and manual.

a video clip i recorded of what i have tried so far. i tried to focus close objects far objects view outside inside.

played with the settings.

Go into the menu and select reset camera to clear any setting that you may have inadvertently actuated. That will put it back to the original factory setting.

Re: problems with eos r100 camera zoom and auto focus are not working.

stevet1 — Tue, 23 Dec 2025 14:30:35 GMT

chocolade130919,

What lens are you using?

With no switch on the side of the lens to change from AF to MF, it sounds like you are using a manual lens. If that is the case, half-pressing the shutter button will not focus the lens for you. If you do not have auto focus, you can't change the focus mode either.

Does your lens have a focus ring separate from the zoom ring?

Steve Thomas

Re: problems with eos r100 camera zoom and auto focus are not working.

Waddizzle — Tue, 23 Dec 2025 17:45:25 GMT

What lens are you using?

I suspect the cup/mug that you appear to be trying to focus on is too close to the lens:. Every lens has a different MFD specification, minimum focus distance.

Re: problems with eos r100 camera zoom and auto focus are not working.

deebatman316 — Tue, 23 Dec 2025 17:50:30 GMT

That looks like the kit lens. If it is there are no switches on it to control, AF/MF, IS & the control ring. Instead it’s controlled from the camera menu for RF & RF-S lenses that lack these switches. Some RF & RF-S have physical switches that control those functions. When they lack those switches those settings are controlled from the camera menu.

Re: problems with eos r100 camera zoom and auto focus are not working.

jrhoffman75 — Tue, 23 Dec 2025 17:50:40 GMT

@Waddizzle wrote:

What lens are you using?

I suspect the cup/mug that you appear to be trying to focus on is too close to the lens:. Every lens has a different MFD specification, minimum focus distance.

I had the same thought but then I saw that they said they tried outside.

Re: problems with eos r100 camera zoom and auto focus are not working.

LeeP — Tue, 23 Dec 2025 18:36:04 GMT

"i can't rotate with my hand the lens to change the zoom..."

If the ring won't zoom, could the lens be jammed?

Re: problems with eos r100 camera zoom and auto focus are not working.

Waddizzle — Wed, 24 Dec 2025 13:41:06 GMT

"i can't rotate with my hand the lens to change the zoom..."

If the ring won't zoom, could the lens be jammed?

——————-

Maybe. It’s an STM lens. The STM lenses are “focus by wire.” I am not familiar with the RF version of 18-45mm lens.

The R100 is basically the M6 m2 with an RF lens mount. The lens seems to be an RF adaptation of the EF-M 18-45mm lit lens. I do not know whether this lens has “zoom by wire.” The camera does have a setting that you can enable to “retract the lens on power off.” The existence of the setting suggests that it could have electronic zoom.

Re: problems with eos r100 camera zoom and auto focus are not working.

deebatman316 — Wed, 24 Dec 2025 14:07:21 GMT

@Waddizzle all RF/ RF-S lenses are focus by wire. Doesn’t matter if it’s VCM, USM or STM. The only non-focus by wire RF lens is the RF 75-300mm F/4-5.6 lens. The only reason this lens isn’t is because it uses Micro Motor. Then also it’s an old EF lens that was repackaged for the RF Mount.

Re: problems with eos r100 camera zoom and auto focus are not working.

LeeP — Wed, 24 Dec 2025 17:14:54 GMT

Looking at the lens online is a curious one. The lens has a physical zoom ring, but it has a retractable setting (white dot) and you rotate it to the left to get to the focal length options. I understand the concept of zoom by wire, but if the ring itself will not move...That's what's confusing me.

Re: problems with eos r100 camera zoom and auto focus are not working.

deebatman316 — Wed, 24 Dec 2025 17:35:50 GMT

@LeeP that lens is not “Zoom by wire”. I was just at the camera store earlier looking at that the lens mounted to the EOS R10. It allowed me to zoom in and out while the camera was off. Now the RF-S 14-30mm F/4-6.3 IS STM lens is zoom by wire. It doesn’t have focal length markings on the lens itself. Instead the camera’s LCD screen displays the focal length. I also saw this lens mounted to the EOS R50V. The ring on that lens does move but if the lens doesn’t have power ie the metering timer has timed out. The focal length doesn’t change until the lens has power again. Just like focus by wire lenses. No power no MF adjustment available.