I show this in my review of the unstabilized Sony 14mm f/2.8; the corners can't be well stabilized with sensor shifting alone. Here's another crazy great thing about the new RF 10-20mm f/4 L IS STM : it's about the same and weight as the small RF 14-35mm f/4 L IS USM and weighs only two-thirds as much as the RF 15-35mm f/2.8 L IS USM and it's Pros: compact, light, affordable, super fast auto focus, sharp and excellent bokeh Cos: Not really a complaint. But you need a good body and carefully perform MAFA for better focus as DOF is razor thin at F2. Focus though super fast but offten hunts in low light on 5D mark II. Maybe thats the body issue not the lense. Review manufacturer specifications and detailed lab measurements for the Canon EF 75-300mm f/4-5.6 III USM Lens. Compare the specs and measurements of this lens with other lenses. I suspect you have the older Non-IS, Non-L, version of the EF 100mm f/2.8 USM Macro. Older USM lenses do tend to wear out with age and some will start to slip just as you describe. There is no easy fix and you should really send the lens in for repair. They will probably need to replace the entire USM AF motor. The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes. Has a metal mount. Canon EF 100mm F/2.8L Macro IS USM. Canon EF 135mm F/2L USM. A metal mount is generally superior to a plastic mount as it is more durable. weight. Canon EOS 5D Mark II Canon EOS 80D Canon EF 28mm f/1.8 USM Canon EF 35mm F2.0 Canon EF 100mm f/2.0 USM +5 more Reply Reply with quote Reply to thread Complain - New ET-65III Dedicated Altura Photo Lens Hood. - A perfect Canon ET-65III replacement. - Compatibility: - EF 85mm f/1.8 USM - EF 100mm f/2.0 USM - EF 135mm f/2.8 SF - EF 100-300mm f/4.5-5.6 USM - The addition of a lens hood can help prevent flares-those circles of light that can accompany images where a strong light source is just outside the frame. The image quality of the EF 70-200 f/2.8L IS II with the teleconverter is somewhere between the old EF 100-400 L IS and the new EF 100-400 L IS II. Which is stlll very good. So you can make the EF 70-200 f/2.8L IS II longer, there is nothing you can do to the EF 100-400 L IS II, to give you a wide f/2.8 aperture. IP 93.210.x.x. Owner since: 3 months. Price: 32€. User profile: Amateur. Cons: No manual focus, lots of CA when wide open, little flare. Pros: Very sharp when step down to f5.6, the sharpest at 100mm focal length, nice contrast and natural colors. Focus is on the spot (with the lens I own), nice bokeh. Review manufacturer specifications and detailed lab measurements for the Canon EF 100-400mm f/4.5-5.6L IS II USM Lens. Compare the specs and measurements of this lens with other lenses. N2dn.