Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF] Autofocus Lens for Pentax Digital Cameras

Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF] Autofocus Lens for Pentax Digital Cameras

Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF] Autofocus Lens for Pentax Digital Cameras - Refurbished

Used Cat.# RBT175028P MFR # AF016P700B
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  • 1Description

The Tamron SP AF 17-50mm f/2.8 XR Di-II LD Aspherical [IF] is a lightweight, compact, and fast standard zoom lens designed exclusively for digital SLR cameras. The focal length of this lens is equivalent to approx. 26-75mm in 35mm format.

This lens offers an f/2.8 maximum aperture throughout the entire zoom range, to ensure stress-free photographic shots at all focal lengths and distances. Additionally, a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure.

Note: Di-II lenses cannot be used with digital SLR cameras using image sensors that are larger than that of an APS-C size imager (e.g. 1D series), or with 35mm film SLR cameras.

Optimized for Digital SLR
The use of XR (Extra Refractive Index) glass optimizes the overall distribution of optical power, and also reduces various aberrations to the absolute minimum while achieving remarkable compactness. In addition, suitable positioning of two hybrid aspherical elements serves to maintain imaging performance and to shorten and compress the entire optical system.
LD Glass
An LD (Low Dispersion) glass element is used to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor for enhancing optical quality in digital photography, in order to achieve outstanding optical performance over the entire zoom range.
Enhanced Peripheral Illumination
Peripheral light fall-off is minimized when compared with that of conventional lenses for film cameras, so images are uniformly bright from the center to the periphery.
Internal Surface Coating to Reduce Ghosting and Flare
By employing "Internal Surface Coatings" (i.e., multiple-layer coatings on cemented surfaces of plural elements) and multiple-layer coating technology on ordinary elements, ghosting and flare due to the reflections that occur when light enters through the front element and reflections caused by the imagers themselves are reduced to the absolute minimum.
Zoom Lock Mechanism
The Zoom Lock prevents unwanted barrel extension when carrying the lens/camera combination.
Table of Contents
  • 1Description
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Focal Length 17 - 50mm
Aperture Maximum: f/2.8
Minimum: f/32
Camera Mount Type Pentax K
Format Compatibility Pentax Digital (APS-C)
Angle of View 78° - 31°
Minimum Focus Distance 10.63" / 27 cm
Magnification 0.22x
Maximum Reproduction Ratio 1:5
Optical Design 16 Elements in 13 Groups
Diaphragm Blades 7
Features
Image Stabilization No
Autofocus Yes
Tripod Collar No
Physical
Filter Thread 67 mm
Dimensions (DxL) Approx. 2.9 x 3.2" / 7.37 x 8.13 cm
Weight 15.17 oz / 430 g
Packaging Info
Package Weight 1.65 lb
Box Dimensions (LxWxH) 5.9 x 4.3 x 4.3"
17-50mm f/2.8 XR Di-II LD Aspherical [IF] Autofocus Lens for Pentax Digital Cameras is rated 4.3 out of 5 by 46.
Rated 3 out of 5 by from Not bad, not without issues Bought this mainly for inddor photography. Great sharpness when in focus but I get variable front focus, especially under artificial light. It's a bit difficult to manually focus with this lens as it has a very short throw (on the upside, focusing is fast, which is sometimes ok with the K20D focus adjustment). Another problem with this lens is that it tends to under-expose when stopped down (but this can be easily fixed with some experience). I personally find the zoom ring to be a bit resistant when turning but other people seem to appreciate it. Otherwise it's a very sharp lens, even wide open.
Date published: 2008-12-22
Rated 5 out of 5 by from Great Travel Lens I travel on business and try to take a rather small and lightweight sling bag to carry my camera and lenses. I added this fast wide zoom lens to my Pentax K10D. It did not add much additional weight and produces excellent quality photos. My two other travel lenses include a Tamron 18-250 and a Pentax 40mm pancake.
Date published: 2008-04-30
Rated 5 out of 5 by from Just get it! This is a fabulous lens, extremely sharp, very good color balance, very little color aberration. I have tried Pentax SMCP-DA* 16-50mm f/2.8 and returned in because of very annoying color aberration. Tamron lens is sharper, smaller and less expensive. It allows to take excellent photos in difficult situations (not enough light, fast moving objects, etc)
Date published: 2008-08-22
Rated 4 out of 5 by from Fast, sharp, AND cheap I use this lens as a general lens, for portraits (75mm equiv at full zoom) and for available light photography when I need more versatility than my 50mm 1:1.4 It also focuses quickly when there's very little available light. I don't use flash or focus assist in these circumstances. It's not quite as sharp as the 50mm 1:1.4 Rokkor but the difference with the zoom set to 50mm is very little. It's light, constant f/2.8 and feels reasonably solid; there's no play in the lens tube at any zoom setting. The bayonet fit petal lens hood works well. The lens does not come with a padded lens bag but if it keeps the cost down I can live without it. It performs best at 50mm and stopped down to f/5.6 or f/8. Its softer at 17mm and wide open, but this is preferable to me since the performance at 50mm is most critical. At it's worst it still outperforms any kit lens. This lens is great value for money; you'd have to pay a lot more to get anything better.
Date published: 2008-07-29
Rated 5 out of 5 by from More than meets expectations Overall I find this lens sharp, with nice micro-contrast. More than usable wide open. So far I've not noticed any significant focusing issues, though it is sometimes difficult to achieve a focus lock with night street photography. (I almost always have the AF set for center spot.) Pixel-peeping, I do notice some resolution fall-off in the corners at 17mm, but nothing really objectionable. And virtually no ghosting and relatively flare free. The only time I've noticed any ghosting is when the filter had gotten smudged. Speaking of which, I also sprung for a B&W XS-PRO Digital UV filter. Expensive, but I believe it's made a major difference in performance.
Date published: 2010-10-06
Rated 5 out of 5 by from Great low light lens I use this lens for moonlit landscapes wide open.Lightweight,sharp,great walk around lens
Date published: 2011-12-12
Rated 3 out of 5 by from Quirky Compromise Lens First things first, let's get the good out of the way. It's razor sharp, even wide open. If that's all that matters to you in a lens, stop, do not pass Go! and buy this lens. Bokeh is pleasing for its price range as well. OK, now onto the quirkiness. AF is tempermental, that is to say, sometimes it is responsive, other times less so. I would say AF speed is average at best. Although I don't have any BF or FF issues. And yes, it's noisy, but that's to be expected. What's really odd is exposure consistency. It underexposes consistently .3 EV without flash, .7 at 17mm with flash, and 1.3 EV at 50mm with flash. The good news is that this is totally consistent. It's just annoying. Build is acceptable, but nothing to write home about. Manual AF is not steller, but it works just fine. Upshot: it's a compromise lens. Great price, great optics, weird performance, average build. As long as you know what you're getting yourself into, I recommend it.
Date published: 2010-11-08
Rated 2 out of 5 by from Unimpressed. Focusing issues I was looking to upgrade the kit lens that came with my K-X and read many good reviews about this lens. When I got it, though, I was thoroughly unimpressed. I actually returned the first copy because I thought I had a bad one. The second one was pretty much the same. Color aberration was better and it did better in very dark situations, but other than that, photo quality was virtually the same as the kit lens. There was no noticeable difference. I was hoping for better colors and contrast, but after numerous side by side comparisons there was no obvious difference. However, the main issue I had with both copies of the lens was an inability to consistently focus properly. I tested it alongside my kit lens numerous times. The Tamron was hit or miss on focusing on what I was aiming at while my kit lens was spot on every time. I was baffled as to what the Tamron was actually focusing on. I tried numerous setting combinations, which helped but did not solve it. I knew it could achieve proper focus because I could manually focus it properly, but the AF seemed to have a mind of its own. Maybe I got 2 bad copies, but even if the focusing issue were fixed I would still be unimpressed with this lens.
Date published: 2010-07-08
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