Lens hd pentax da 55-300mm f4-5.8 ed wr đánh giá năm 2024
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(From Pentax lens literature) Ricoh Imaging Americas Corporation (Ricoh Imaging) has announced the introduction of a new HD PENTAX-DA lens. Specifically designed for PENTAX K-mount DSLRs, the new HD PENTAX-DA 55-300 mm F4-5.8ED WR is a versatile telephoto zoom lens that features the PENTAX high-grade multi-layer High Definition (HD) coating and dependable weather-sealed construction. Complementing the largest offering of APS-C optimized lenses in the imaging industry, the new HD PENTAX-DA 55-300mm lens is the 28th in the Ricoh Imaging lineup of PENTAX K-mount lenses architected and engineered to perfectly pair with an APS-C-sized sensor. With a zoom ratio of approximately 5.5 times, the 55-300mm range covers a wide range of focal lengths from medium to super telephoto and thanks to the sturdy and dependable weather-sealed construction the HD PENTAX-DA 55-300mm lens can also handle a wide variety of weather conditions ensuring moisture or rain are never the cause for a missed photo. Additionally, thanks to the treatment of the PENTAX HD coating, photographers are assured much higher light transmittance than conventional multi-layer coatings, delivering sharp, clear images with significantly reduced flare and ghosting, even under demanding, backlit conditions. “With the announcement of the our new long zoom 55-300mm lens, Ricoh Imaging now offers twice as many APS-C optimized lenses as some of our competitors,” said Jim Malcolm, Executive Vice President, Ricoh Imaging. “Pair this with our robust family of APS-C DSLRs, which includes the newly announced PENTAX K-3, and consumers a guaranteed an unequaled imaging experience that combines sharp optics with powerful electronics to create beautifully crisp and clear images.” Ricoh Imaging’s full line of APS-C cameras includes the full-featured, entry-level K-500; the customizable, weather-sealed K-50; the robust, highly-regarded K-5IIs as well as the standard setting K-3, which touts a host of professional-grade features like a high-resolution 24 megapixel image sensor, fast 8.3 frames per second frame rate, selectable anti-aliasing filter and easy and seamless wireless connectivity with unprecedented functionality. Pricing and Availability The HD PENTAX-DA 55-300 mm F4-5.8ED WR will be available for purchase online at www.us.ricoh-imaging.com and at retailers nationwide in November 2013 for a suggested retail price of $449.95. Pentax55-300mm f/4-5.8 ED WR HD DAPentax 55-300mm f/4-5.8 ED WR HD DA User Reviews10.0/10average of 1 review(s) Build Quality10.0/10 Image Quality9.0/10 10 out of 10 pointsand recommended by Tord (30 reviews) Water/dust resistant, latest lens coating. Screw-drive focusing, thus a bit noisy. The HD DA55-300 is a modernised version of the DA55-300, so the optics are the same, but the lenses have the latest coatings, which makes a great difference in practical use. The addition of seals makes the lens more rugged, and feels much more like a pro-lens than the earlier version. It is not the fastest focusing lens around, but still impressively fast. With a K-30 attached to it you'll have a very fast, sharp, package, still impressive after a lot of new lenses and cameras have appeared on the market. My wife paid $100, and paid the rest in form of her old, surplus DA55-300, a very fair price. Normally it costs around $500. Sorry, we just need to make sure you're not a robot. For best results, please make sure your browser is accepting cookies. Type the characters you see in this image:Try different image Conditions of Use Privacy Policy © 1996-2014, Amazon.com, Inc. or its affiliates SMC Pentax 55-300mm f/4-5.8 GD DA ED WR ( and APC-S coverage, 58mm filters, 16.4 oz./466g, 4.6'/1.4m close focus, about $340). enlarge. I got mine at B&H; I'd also get it at Adorama or at Amazon. This all-content, junk-free website's biggest source of support is when you use those or any of when you get anything, regardless of the country in which you live. Pentax does not seal its boxes, so never buy at retail or any other source not on since you'll have no way of knowing if you're missing accessories, getting a defective, dropped, damaged, returned, store demo or used lens. My ship from remote automated warehouses where no salespeople or lookie-loos can ever get their greasy fingers on your new lens before you do. Buy only from the for the best prices, service, return policies and selection. Thanks for helping me help you! Ken. July 2015 Pentax reviews all reviews Introduction This SMC Pentax 55-300mm DA is a relatively inexpensive telephoto zoom for Pentax digital SLRs. It's better than I expected for a mostly plastic lens. It's reasonably sturdy and performs well. It focuses closer than most professional zooms: 4.6 feet or 1.4 meters, which gives great . Most Pentax digital bodies provide image stabilization with this unstabilzed lens. You can grab the focus ring at any time the AF system isn't actually trying to move the lens for instant manual override. Formats & Compatibility This 55-300 lens is optimized for APS-C cameras. It has the KAF2 lens mount. It's not supposed to work on full-frame—but I tried it, and it usually covers most of the 35mm frame. I wouldn't call this a full frame lens by any means, but if you do use it, the corners may get fuzzier, but at least they don't cut off to black. Of course it's fine on digital SLRs. It mounts, meters, manually focuses and shoots on , but since it has no aperture ring, it always meters and shoots at f/22 at 55mm to f/32 at 300mm. Viewing and focussing is wide open, but you have to imagine that it's always going to shoot at f/22 ~ f/32. Specifications Name Pentax calls this the HD PENTAX-DA f/4-5.8 55-300mm ED WR. HD refers to new coating that replaces the classic SMC multicoating. DA means it works on Pentax digital cameras. ED means it uses extra-low dispersion glass to give sharper pictures, specifically to reduce secondary chromatic aberration. WR means weather resistant, owing to a few gaskets inside to try to give it some resistance to dust and water. Optics 12 elements in 8 groups. Partly multicoated, oddly not branded as "Super Multi Coating" (SMC). Diaphragm Pentax EF 55-300mm DA at f/22. 6 rounded blades. Stops down to f/22~32. Maximum Aperture f/4 at 55mm. f/5.8 at 300mm. That's f/5.8, not f/5.6, not that there's any significant difference. Focal Length 55-300mm. On Pentax digital cameras it will see angles-of-view similar to what an 85-450mm lens would see on a 35mm camera. Angle of View 29º ~ 5.4º diagonal on Pentax digital. Close Focus 4.6 feet (1.4m) from the image plane. Maximum Reproduction Ratio 1:3.6 (0.28x). Hard Infinity Focus Stop? No. You have to let the AF system focus for you at infinity. Focus Scale Yes. Depth-of-Field Scale No. Infra-Red Focus Index No. Filter Thread 58mm. Plastic. Hood The plastic bayonet hood is included. It has a clever little sliding cover that lets you rotate a grad or polarizer without removing the hood. Caps Nice 58mm O-LC58 front cap. The usual Pentax bayonet rear cap. Case S80-160 case, Pentax 55-300mm WR. The case is a padded nylon pouch, which is perfect for throwing in a backpack, trunk or glove box. Size Pentax specifies 2.8" (71mm) diameter by 4.4" (111.5mm) long. Weight 16.440 oz. (466.0 g) actual measured weight. Pentax specifies 16.4 oz. (440 g). Included Lens. Caps. S80-160 case. PH-RBI 58mm hood. Pentax Model Number 22270. Price, USA 2015 July: $340. Performance Overall SMC Pentax 55-300mm DA. The Pentax 55-300mm DA is pretty nice lens for its low price. It handles well, has little distortion and focusses very close. Autofocus Autofocus is via 1980s technology: a motor in the body connected via a screw coupling. AF Speed AF is relatively noisy and slow, as if we're still in the 1980s. It's fast enough for most uses, but it won't be if you have to focus all the way from near to far quickly. So long as you're in a similar range, like shooting your kids in sports, it will work quickly, but expect it to take one second to rack all the way in or out from one end to the other. Auto/Manual Switching Just grab the ring at any time the camera isn't trying to autofocus. The ring turns during autofocus; keep your fingers away until it stops. Manual Focus Manual focus is easy; just turn the ring. Bokeh Bokeh, the quality of out-of-focus areas as opposed to the degree of defocus, is fair to good at 55mm, and very good to excellent at 300mm. Pentax 55-300 DA shot at 55mm at f/4 on a Pentax K3 II. Camera-original © JPG file. Pentax 55-300 DA shot at 55mm at f/4 on a Pentax K3 II. Camera-original © JPG file. Focus Breathing Focus breathing (the image changing size as focused) is mostly of interest to cinematographers who don't want the image changing size ("breathing") as the lens is focused among different subjects. The image from the Pentax 55-300mm DA gets larger as focused more closely. Distortion The Pentax 55-300mm DA has less distortion than expected for a 6:1 zoom, and many Pentax cameras can be set to correct for this as well. Shot uncorrected, use these correction factors in Photoshop's lens distortion filter to correct it fully. These aren't facts or specifications, they are the results of my research that requires hours of photography and calculations on the resulting data. On APS-C at 10' (3m) Correction factor with uncorrected images 55mm +1.0 100mm -3.2 200mm -2.5 300mm -2.0 © 2015 KenRockwell.com. All rights reserved. Ergonomics This little lens handles much better than expected. It's sturdy and the grippy rings are just that: sturdy and grippy. Keep your hands off the focus ring anytime the AF system is turning it, otherwise, grab it at any other time for instant manual focus override. Filters, Use with The plastic 58mm filter threads are big enough that at least a couple of stacked filters won't cause any vignetting on digital. There is no need for expensive "thin" filters. Lateral Color Fringes There aren't the usual lateral color fringes on a Pentax K3 II at 24MP, but there are many other various chromatic aberrations visible at larger apertures. You'll see all sorts of minor color fringes wide-open, but they go away as stopped down. Macro It gets very close since it can focus to 4.6'/1.4m at 300mm: Rolex Submariner at close-focus distance at 300mm shot on Pentax K3 II at f/20. Camera-original © JPG file. Crop from above image at 100%. If this is 6" (15cm) wide on your screen, the full image would print at 40 x 60" (1 x 1.5 meters)! Camera-original © JPG file. Mechanics Pentax EF 55-300mm DA. bigger. The Pentax 55-300mm is better made than most plastic lenses. It has a metal mount and focus ring, and the waffle-pattern grips are nicer than most others today. It's certainly nicer than Nikon or Canon's all-plastic 55-300mm lenses. Filter Threads Plastic. Hood Mount Plastic. Front Barrel Plastic. Focus Ring Metal with rubber grip. Identity Printed on red-anodized aluminum ring on the zoom ring. Zoom Ring Plastic, rubber-covered Rear barrel Plastic. Internals Looks like all plastic. Moisture seal at mount Yes. Mount Chromed metal. Markings Paint. Serial Number Printed on a sticker glued into a recess in the bottom of the black plastic lens barrel. Date Code None found. Noises When Shaken Mild clunking. Made in Vietnam. Sharpness Image sharpness depends more on you than your lens, and lens sharpness doesn't mean much to good photographers. It's the least skilled hobbyists who waste the most time blaming fuzzy pictures on their lenses, while real shooters know that few photos ever use all the sharpness of which their lenses are capable due to subject motion and the fact that real subjects are rarely perfectly flat. The Pentax 55-300 is sharp in the center wide-open, and gets even better as stopped down. It can be softer on the sides wide-open, also improving quickly as stopped down. That's not usually important, as there is rarely anything in focus on the sides, and even if there was, few people print 6 feet (2 meters) wide where it might matter. Like all lenses it gets softer at the very smallest apertures due to diffraction. Spherochromatism Spherochromatism, misnamed "color bokeh" by laymen, is when out-of-focus highlights take on color fringes at full aperture. Spherochromatism is a completely different aberration from . It has a little bit of spherochromatism at the 300mm end, where background highlights can have slight yellow fringes and foreground highlights can have slight blue fringes wide-open. Recommendations This is a great little telephoto lens for Pentax digital cameras. It's small, light, sturdy, inexpensive and focuses close enough to eliminate the need for a dedicated macro lens for most uses. If you find my work here helpful, my biggest source of support for this free website is if you get yours at B&H, at Adorama or at Amazon. When you use those or any of when you get anything, regardless of the country in which you live, it helps me keep adding to this free website — but I receive nothing for these efforts if you take the chance of buying elsewhere. Unlike a bottle of milk or a CD, DVD or Blu-Ray disc, Pentax doesn't seal its boxes so you have no idea if you're actually getting a used product if you risk buying at retail. Never buy at retail. 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