Specification
Product Details
- Brand: Pentax
- Model: 2170
- Number of items: 1
- Dimensions: 5.30" h x
3.30" w x
3.30" l,
1.82 pounds
Features
- The Pentax 21700 is a fast high-performance DA series lens
- High performance telephoto lens
- SDM system creates smoother, quieter auto focus
- Weather resistant and dust resistant body
- Quick-shift Focus System for instant switching from auto focus to manual focus
Product Description
LENS PENTAK FIXED 200mm F2.8 ED
Customer Reviews
Most helpful customer reviews
40 of 41 people found the following review helpful.
Top Notch - with a Caveat
By P. VANDALEN
In order to augment my Pentax DA*50-135 f2.8 with more reach, I had been interested in the Tamron 70-200 f2.8 but decided to go with the Pentax DA*200 f2.8 - I really wanted the SDM focus motor of the Pentax lens. Online professional lab tests indicated typical prime lens performance in near zero distortion and across-the-frame level sharpness over a wide range of apertures. But the caution here is the surprisingly high level of purple fringing they experienced at open apertures.The construction, feel and appearance of this lens is nothing short of the best offered by Canon and Nikkor. Unless I'm mistaken, the DA* 200 has a metal body and the only detectible plastic is the huge impressive lens hood edged in rubber. In comparison, the DA*50-135 is quality plastic with focus ring action that isn't quite as butter-smooth as the DA*200 and has internal rattles that the 200 doesn't (zoom mechanism?). The pictures taken with the DA* 200 I found to be outstanding. While the lab numbers for sharpness are a tad lower than the DA* 50-135, the resultant images are every bit as good and actually better in across-the-frame sharpness and contrast. I've been very impressed with the several hundred pictures I've taken so far with this lens. However, there is a down side to consider.When I first mounted this lens on my K10D, the AF system would jam near infinity. I had to switch to manual mode to free it. This happened a few times and then never happened again. The next thing I noticed was that the lens had a significant back-focus problem. On my K20D, however, it was fine and only needed a small amount of AF adjustment provided only by the K20D. But I soon learned that the problem was the K10 camera and not the lens; some K10Ds apparently have been experiencing a back focus problem, but one that is now correctable via a software program from Russia that let's one hack into the K10D's firmware (v1.3) and bring up the Debug Mode menu. This allows for focus adjustment much like the K20D but not for individual lenses. Problem fixed. The DA*200 and my DA*50-135 now focus perfectly on my K10. So the only remaining issue here is the harsh purple fringing on edges of medium to high contrast objects and features shot at anything under f4.0. The fringing can be quite pronounced and annoying. It also appeared that the lens was noticeably less sharp at f2.8, but I found that softness to be more a product of the fringing. However, purple fringing can be greatly reduced, if not eliminated, with various software photo editing tools available.I had hoped that the DA*200 f2.8 would be a perfect lens given the price and the fact that it is a prime and not a zoom. But few lenses are perfect, so it becomes a matter of the buyer deciding whether the overall performance relative to the price meets your expectations. For me the fringing issue gave serious pause, but the exceptional look and feel of this lens in combination with the overall quality of the shots I've taken have convinced me to keep and treasure it. Next consideration: how much would the image be degraded and fringing increased with a 1.4x teleconverter to produce a 280mm f4.0?Update (11/11/08): I discovered that it is important to ensure that the auto focus adjustment in the camera (K10 or K20) is properly set for this lens and balanced across all apertures. It appears that apertures of f2.8 through f3.5 tend to shift toward back-focus - at least on my copy. This means that if you are boarderline back-focusing at f4 and higher, but still sharp, you may slide into a back-focus situation under f4 without knowing it, as I was, and images will be slightly fuzzy. This in combination with purple fringing, when it occurs, could result in a foggy-halo effect that I had been seeing in many of my pictures taken in brighter light. Once I curred my slight back-focus, images shot at or near f2.8 are now just about as sharp as those taken at f4 and higher. In resolving the AF adjustment issue with this lens and comparing results between the K10 and K20, I was reminded of what a nice improvement in resolution and noise reduction the K20 is over the K10. But regardless of what Pentax D-SLR you use, this lens will get you truly impressive results.Update (11/22/08): I tried the Tamron AF 1.4x tele-converter on this lens and was surprised by the quality of the images - no noticeable reduction in sharpness, contrast or color. Purple fringing, when it occurs, is no worse with this TC. I was also pleasantly surprised when I found that the SDM focus system still works, although it tends to hunt for focus just a bit more under lower light conditions. The Tamron AF 1.4x essentially turns this lens into an impressive 280mm f4. So good are the images with the Tamron TC on the DA* 200mm that I no longer have an interest in either the Pentax DA* 300mm f4 or the Sigma 100-300mm f4. While this TC looks to be a perfect match with the DA* 200, interestingly, quick tests with the DA* 50-135 did reveal some degradation in sharpness, contrast and increase in aberrations.
10 of 11 people found the following review helpful.
A Performer
By Gerard Mcevoy
The Pentax DA* 200MM f/2.8 ED IF SDM Lens was quite an upgrade to my relatively small stock of lens. I shoot different photographic seens most of which are sport events in low light conditions. This fast lens excells in those environments in combination with my K20D DSLR. AF speed is remarkable. Clarity is brilliant. I have mostly "keepers" in fast action such as high school football games. The value for dollar makes the Pentax DA* f/2.8 200MM ED IF SDM Lens an outstanding investment in your photography. This lens has taken my game to a new level. The first sport event photo competition I entered I won 1st place with this incredible lens. I currently use this lens for approximately 70% of my shots. If you have the photo bug this lens is a must for you.
2 of 2 people found the following review helpful.Lives up to its reputation
By Mark Dargan
I have a been a Pentax SLR owner for 30 years and so have acquired a collection of lenses, all of which work on my K5 DLSR thanks to Pentax's excellent K mount. After thinking about it for nearly a year I finally purchased the 200mm f2.8 and I have to say after two weeks, that this is the first Pentax lens I own which consistently surprises me with the "snap", colour and life it brings to every shot. Even mundane pictures of flowers in my back garden have that extra punch that makes people look twice. Colour, contrast and sharpness are truly excellent. There is little or no flare from strongly backlit subjects. It does suffer a little from purple fringing at high contrast boundaries at low apertures (I saw it on mountain shots of land with patches of snow) but as everyone says, this can be removed in Photoshop by desaturating that particular shade of purple. I am also really enjoying using the f2.8 aperture for hand held indoor shots even with low ISO settings. Most current digital lenses have rather high minimum apertures, and my old f1.7 50mm is fiddly manual focus. This compensates for the considerable extra weight and, especially with the very large rubber tipped (a useful touch) lens hood, the extra length, compared to my 50-200mm standard zoom. SDM powered focusing is silent and quick on my K5. All in all, precious money very well spent.
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