USM motor is fast and can have the stroke shortened for even faster focusing. The only thing I wish is that Canon would include the $200 tripod mount with the lens. Fortunately the tripod mount from the 70-200 F:4 USM (non-IS) will fit. Absolutely amazing lens for well under $1000. View review in forums Leave a comment on this review
Gear review: Canon EF 300mm f/2.8 IS II USM for bird photography. The Canon 300mm f/2.8 L IS II USM is the absolute best performer in the Canon telephoto lens lineup when it comes to autofocus speed and sharpness. Note that this review reflects my opinion, based on my own experience.
Prime lens. Max Format size. 35mm FF. Focal length. 300 mm. Image stabilization. Yes (2 stops) Lens mount. Canon EF.
IMHO the modern 300 f/2,8 lenses are completely different beasts (and not necessarily best suitable for astro imaging as inquired by Jerry Lodriguss tests on Canon EF 300 f/2.8 L). The first-series EF 300 f/2.8 (and the immediate predecessor FD 300 f/2.8 L) can be very good for astro providing the internal focus floating group do not develop
Canon EF 300mm f/2,8 L USM Review. This is a prime lens manufactured by Canon and the lens was released 1987. The lens belongs to the category telephoto prime lenses, a telephoto lens where you do not have the possibility to zoom in and out. It's been a long time since the lens and this model first was launched. This means that you can make manual adjustments once the AF has finished, without changing to manual mode. has a silent focus motor built into the lens. Canon EF 70-200mm F/2.8L USM. Canon EF 70-300 F4-5.6 IS II USM. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body
The middle section of the EF 400mm f/4 DO IS II is also slightly narrower than the EF 300mm f/2.8 IS II. The photos below show both lenses side-by-side. In terms of hand holding, both lenses are very easy to hand hold, however the EF 400mm f/4 DO IS II feels surprisingly more comfortable to hand hold for very long durations.
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    • canon ef 300mm f 2.8 l is ii usm review