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Canon EF-S 18-135mm STM Focus Issue


So I recently bought this lens second hand and I noticed a problem with the focus where it only focuses to a certain distance. Both for auto and manual focus. I use this with a Canon M6 MKII and I use the viltrox adapter for it. My 50mm f/1.8 II focus works perfectly with the adapter.
Hoping to get some suggestions on how to fix it. Or if this is a common thing. Thanks in advance!



Hi and welcome to the forum:

Given that your lens is second-hand, are you sure it functioned fully when you purchased it?

cheers, TREVOR

Before you ask us, have you looked in the manual or on the Canon Support Site?
"All the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris


This lens is focus by wire. That's why manual focus isn't working correctly either. If the adapter isn't functioning correctly it can cause problems too. Test the lens out on a EF-S Mount camera to see if it works correctly.


Current Gear: EOS 5D Mark IV, EF Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D & Sigma 17-50mm F/2.8 EX DC OS HSM