Question about Canon EF 35-350 F3.5-5.6 IS USM Lens
There's nothing you can do without stripping the lens down: definitely not a DIY job on your lens!
Barring any actual faults, the smoothness is determined by a number a factors such as how well the components were originally machined, how well the lubricants are distributed internally and the condition of internal bushings. Even the pneumatic action of air entering and escaping the lens as it's zoomed can have an effect.
In practice, new lenses may need a bit of breaking in to become fully smooth, lenses which are not often used will tend to lose their smoothness as inactivity allows internal lubricant films to dry out. I've also found that superzooms such as yours have so many elements moving around inside that it's difficult to find a truly smooth one unless upgrading to a professional grade lens.
If there's anything in the motion which is definitely notchy or catching then there is a fault and the lens will need professional attention, but if the lens is still fully usable then you might decide to live with the fault whilst saving for a replacement lens as labour costs alone will make you wince.
Sorry not to be able to offer anything more positive, but not everything is a quick and easy fix.
Posted on Jul 05, 2010
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Posted on Jan 02, 2017
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