topic Re: Lens 100-400mm issues in EF & RF Lenses

EF 100-400mm f/4.5-5.6 IS II USM Won't Zoom

jmontgomery — Fri, 03 Feb 2023 15:45:47 GMT

I have a 100-400mm lens. All of a sudden the lens wont zoom. Manually or auto. It its stuck. It isnt locked! Any advice welcome! PLEASE HELP!

Re: Lens 100-400mm issues

deebatman316 — Fri, 03 Feb 2023 00:22:31 GMT

Is this the EF 100-400mm (designed for DSLR Cameras) or the RF 100-400mm (designed for mirrorless cameras). None of Canon's DSLR or SLR camera lenses have a power zoom feature. Are you talking about Autofocus and Manual Focus. This is completely different from power zoom.

-Demetrius

Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 430EX III-RT, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D, Sigma 17-50mm F/2.8 EX DC OS HSM & EF 28-135mm F/3.5-5.6 IS USM

Re: Lens 100-400mm issues

jmontgomery — Fri, 03 Feb 2023 00:25:40 GMT

Yes I am referring to auto and manual focus I am new to the photography world. I dont know all the right terminology

Re: Lens 100-400mm issues

deebatman316 — Fri, 03 Feb 2023 00:42:13 GMT

Is this the RF 100-400mm or the EF 100-400mm. Please give the Full model name of your lens this is very important.

-Demetrius

Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 430EX III-RT, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D, Sigma 17-50mm F/2.8 EX DC OS HSM & EF 28-135mm F/3.5-5.6 IS USM

Re: Lens 100-400mm issues

jmontgomery — Fri, 03 Feb 2023 01:01:09 GMT

It is an EF 100-400mm 1:4.5-5.6 IS II USM (thats what on the end of the lens)

Re: Lens 100-400mm issues

deebatman316 — Fri, 03 Feb 2023 01:09:55 GMT

Does the focus distance indicator window change as the focus ring is turned. If NOT you have a lens problem. This lens provides manual focus override when the AF/ MF switch on the lens is set to AF. You can turn the manual focus ring at anytime without risk of damage the lens AF motor.

-Demetrius

Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 430EX III-RT, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D, Sigma 17-50mm F/2.8 EX DC OS HSM & EF 28-135mm F/3.5-5.6 IS USM

Re: Lens 100-400mm issues

jmontgomery — Fri, 03 Feb 2023 01:12:24 GMT

The focus rings wont turn.

Re: Lens 100-400mm issues

deebatman316 — Fri, 03 Feb 2023 01:37:25 GMT

Will the focus ring turn with the AF/ MF switch set to MF. If NOT your lens needs to be sent in for repair. The focus ring should turn even with the lens set to AF. Make sure your turning the smaller ring of the two on the lens. Link to Manual for Lens

-Demetrius

Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 430EX III-RT, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D, Sigma 17-50mm F/2.8 EX DC OS HSM & EF 28-135mm F/3.5-5.6 IS USM

Re: Lens 100-400mm issues

jmontgomery — Fri, 03 Feb 2023 02:45:38 GMT

It wont turn. I appreciate your help. I was hoping it would be an at home fix!

Re: Lens 100-400mm issues

jaewoosong — Fri, 03 Feb 2023 07:15:20 GMT

Could it be the smooth <-> tight ring is set for "tight"? see this video from 1:50

(6) The Canon EF 100-400mm F/4.5-5.6L IS II USM Lens In-Depth Review - YouTube

Re: Lens 100-400mm issues

MikeSowsun — Fri, 03 Feb 2023 15:40:20 GMT

@jmontgomery wrote:
The focus rings wont turn.

Why are you saying “rings” plural? There is only one focus ring and one zoom ring. Are you saying both the focus ring AND the zoom ring are stuck and will not move?

Re: Lens 100-400mm issues

jmontgomery — Fri, 03 Feb 2023 15:42:01 GMT

I had mentioned previously it wasnt this. Thank you though!