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The best protective filter is the 77mm Hoya multicoated HD3 UV which uses hardened glass and repels dirt and fingerprints. Shooting only wide-open is why we buy this lens in the first place. If you're shooting at f/4, the 70-200mm f/4 is much less to carry.

It works great on APS-C cameras, too, on which you may make the usual inferences, however for APS-C you might prefer the 55-250mm IS STM for half the price that adds Image Stabilization and a broader zoom range. EF means "electronic focus," meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF. Flare and ghosts are typical for a modern complex zoom. You'll never see any unless you go out of your way to shoot directly into the California desert sun, and then only if you deliberately put something dark on the other side of the frame against which to highlight any ghosts.

The centimeter (symbol: cm) is a unit of length in the metric system. It is also the base unit in the centimeter-gram-second system of units. The centimeter practical unit of length for many everyday measurements. A centimeter is equal to 0.01 (or 1E-2) meter. Definition of inch Our friendly team will be happy to discuss all of your hollow section requirements, so why not give us a call today on 0800 123 70 10 for advice and to get our latest prices. alternatively, drop us a line at: [email protected] See Is It Worth It and Should You Upgrade. If you deserve the best or shoot for a living, of course you need this, but if you're a student, of course you don't. Metal Supplies™ have been supplying the UK building and construction industry with all types of structural steel for many years, including a wide range of Mild Steel Steel Hollow Sections: square, rectangular and circular. Be sure your card has the same serial number as your lens, otherwise it's worthless. The serial number on the box should also match the lens and warranty card.

Canon RF 70-200mm f/2.8L IS USM (on Canon EOS R5) at 1/2000 sec, f/2.8, ISO500 (Image credit: James Artaius / Digital Camera World) First among them is perception. Bluntly, lenses that extend as they zoom are generally kit lenses –so it feels a bit out of place for a premium L-series lens to feature the same mechanism as cheaper lenses that come bundled with cameras. Falloff on FX and 35mm is invisible, except at 200mm at f/2.8 if you leave Vignette Correction OFF, which is the same way just about every Nikon f2.8 tele zoom has been since the 1980s. Images from this RF lens are beautiful, with plenty of 'pop' and three-dimensionality, and the sharpness gives real bite to the resolution across the entire frame. This is an even bigger deal when you're shooting on the hi-res bodies such as the Canon EOS R5, as weaknesses in the glass are exposed by its 45MP sensor (especially in the corners and edges, where softness and muddiness generally hide). Breathing is a motion picture term which refers to what happens as you pull (change) focus from near to far. In movies we do this as the conversation goes from one actor to the next. As a viewer you don't notice it because your eyes are also going between actors, but if you pay attention, you can see focus move from near to far. There are people called focus pullers whose sole job is to do this.ED: Magic Extra-low Dispersion glass for reduced secondary chromatic aberration (sharper pictures). There is another 70-200mm f/4 L IS and 70-200mm f/2.8 L IS that do have IS. They cost more and I prefer them. While old 70-200s had their zoom rings in the middle of the lens, it's finally up front where your hand is. Now you have to move a little bit if you need to tweak the focus, while the zoom ring you use all the time is right where we need it.

There's very little depth-of-field, but what is in focus is ultra sharp and you can see every detail in every piece of fuzz— and this is wide-open where lenses are softest. It has a little bit of cool - warm s p h e r o c h r o m a t i s m, but nothing to get excited about: That's about it. Canon makes this clear: get this if you want an easy-to-carry high quality tele zoom and can forego . This is as close as it gets with a 1.6x camera. It will be less close with a 1.3x or full-frame camera. More at Crop Factor. I see no signs of false color in lab tests or real-world samples. It effectively suppresses both lateral chromatic aberration (CA), which is often visible as purple fringing around tree branches or power lines that fall within the plane of focus, and longitudinal type (LoCA), which shows up as false purple and green color in specular highlights and transitional areas away from the plane of focus. Sony a7R IV, 200mm, f/2.8, 1/500-second, ISO 125 (Credit: Jim Fisher)Flare and ghost performance is nothing out of the ordinary. You won't see any under normal use, and if you try to blind yourself looking at the sun, you'll be able to excite some.