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

[jmontgomery]

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!

[deebatman316]

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

[jmontgomery]

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

[deebatman316]

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

[jmontgomery]

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

[deebatman316]

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

[jmontgomery]

The focus rings wont turn. 

[deebatman316]

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

[jmontgomery]

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

[jaewoosong]

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