EF 28-105 AF not working

[Markussqw]

Hello! I have an EF 28-105 f/3.5-5.6 lens (USM motor) and I have AF problems with it. the autofocus does not work, I hear a few clicks while focusing (very softly), and the focus ring is difficult to move. I have another USM lens, but the ring on this one is very difficult to move.

[deebatman316 · Accepted solution]

Something is broken in the lens. Time to look for a new lens. It’s also not serviceable by Canon anymore. Time to look for a new lens.

[Waddizzle]

Sounds like there’s some sort of issue.  I don’t think the lens is still being repaired by Canon. 

[Markussqw]

Could it be that the lens is very dusty inside?

[Ron888]

I dont think the dust is affecting the focus motor.More likely its broken somewhere inside

[Markussqw]

Ok, i dont want to replace the USM motor. I buy a new lens

[deebatman316]

Do either of those lenses have a focus distance window on them. If they don’t they use the cheaper Micro Motor USM. These lenses DO NOT support Manual Focus override while in AF mode. So don’t attempt to turn the focus ring in AF Mode. Only the EF 50mm F/1.4 USM lens supports it. It has an additional clutch system to support this. It is also the only Micro Motor USM to support it.

[Markussqw]

But this lens has a focus distance window

[deebatman316 · Accepted solution]

Something is broken in the lens. Time to look for a new lens. It’s also not serviceable by Canon anymore. Time to look for a new lens.

[Markussqw]

What's the best RF alternative for 400$?

[deebatman316]

The RF 24-105mm F/4-7.1 IS STM lens or RF 24-50mm F/4.5-6.3 IS STM lens.