Lens canon ef 28-300mm f3.5-5.6 l is usm đánh giá
So-called ‘superzoom’ lenses are generally very travel-friendly options, with a compact and lightweight build that makes them ideal for anything and everything from city walkabouts and countryside treks, to jetting around the world. This Canon has a fairly typical zoom range for a full-frame compatible superzoom, but the focus is on rock-solid build quality and performance, with no concession to trimming the size and weight. It’s a lot pricier to buy as well. Pros
Cons
Why you can trust Digital Camera World Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out how we test. The Canon EF 28-300mm f/3.5-5.6L IS USM is the company’s only Canon superzoom lens for full-frame rather than APS-C format DSLRs, and it’s a real heavyweight. Indeed, it’s about three times heavier than superzoom lenses, at 1,670g. As such, it looks and feels much more like a chunky telephoto lens and comes complete with Canon’s trademark off-white paint job and a tripod mounting ring. Launched back in 2004, it also matches the first edition of Canon’s EF 100-400mm IS USM lens in having a trombone-style push-pull zoom mechanism, rather than a more usual twist-action zoom ring, and comes complete with an adjustable friction damper. SpecificationsMount: Canon EF Full frame: Yes Autofocus: Yes Image stabilization: Yes Lens construction: 23 elements in 16 groups Angle of view: 75-8.25 degrees Diaphragm blades: 8 Minimum aperture: f/22-38 Minimum focusing distance: 0.7m Maximum magnification ratio: 0.3x Filter size: 77mm Dimensions: 92x184mm Weight: 1,670g Key features(Image credit: Canon) With a design ethos that clearly concentrates on quality rather than compactness, this lens has the usual L-series trappings. It’s robust, with a weather-sealed, pro-grade build quality and a high-end optical layout to match. This features two aspherical elements and three UD elements. Switches are on hand for AF/MF focusing, an autofocus range limiter than can lock out the short end between 0.7m and 2.5m, and dual panning modes for static and panning shots. Ring-type ultrasonic autofocus comes with the usual full-time manual override and a focus distance scale beneath a viewing window. PerformanceAs you’d expect from one of Canon’s L-series lenses, performance is impressive. Autofocus is fast and whisper-quiet, although the relatively old-generation image stabilizer only has 3-stop effectiveness. Image quality is pretty good overall, but it’s best to stop down a little for decent corner-sharpness and to reduce vignetting at the short end of the zoom range. Lab resultsWe run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of test charts are taken across the range of apertures and zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations. We use Imatest SFR (spatial frequency response) charts and analysis software to plot lens resolution at the center of the image frame, corners and mid-point distances, across the range of aperture settings and, with zoom lenses, at four different focal lengths. The tests also measure distortion and color fringing (chromatic aberration). Sharpness: (Image credit: Future) (Image credit: Future) Centre-sharpness is pretty good for a superzoom lens but edge-sharpness is comparatively disappointing. Across the whole frame, sharpness is completely outclassed by Canon’s much newer RF 24-240mm superzoom for EOS R-series mirrorless cameras. Fringing: (Image credit: Future) Color fringing can be clearly noticeable towards the edges and corners of the frame at short to medium zoom settings, when uncorrected, but it less of an issue at the long end of the zoom range. Distortion: (Image credit: Future) Barrel distortion is pretty heavy at 24mm, switching to less noticeable pincushion distortion at medium to long zoom settings. VerdictAll in all, the Canon EF 28-300mm is an expensive beast of a lens that’s useful when you need to avoid swapping optics on your camera body. It can therefore come in handy for event photography and if you need to react quickly when shooting certain kinds of wildlife and sports. Unlike most superzooms, however, it’s certainly not a travel-friendly option and is comparatively expensive to buy. Read more: Best wide-angle lenses for Canon Best Canon telephoto lenses Best Canon lenses Thank you for reading 5 articles this month* Join now for unlimited access Enjoy your first month for just £1 / $1 / €1 *Read 5 free articles per month without a subscription
Join now for unlimited access Try first month for just £1 / $1 / €1 Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners! His expertise with equipment doesn’t end there, though. He is also an encyclopedia when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related. |