Tamron Af 28 200mm Super Zoom

By | 13/10/2022




In addition to correcting spherical aberration for higher sharpness at the edges of an image, the aspherical elements help to command linear distortion. Although this zoom is not intended for formal architectural photography, it does produce accurate renditions of such subjects. (At 28mm; f/8; B+W polarizer; Fujichrome Provia 100F.)
Photos © 2001, Peter K. Burian, All Rights Reserved

The best-selling zoom lens in history, Tamron’s 28-200mm debuted in 1992. Since and then, it has been redesigned and upgraded in 1996, in 1999, and again in 2001. This near recent (4th-generation) model benefits from significant downsizing, making it the smallest and lightest 28-200mm zoom that nosotros know of that’s on the market today. The change is significant indeed when compared to the already meaty previous model, the 28-200mm Super 2 Macro f/iii.eight-five.6LD AL IF. The filter size is now 62mm vs. 72mm, while “body surface” and weight take shrunk by about 25 percent. Resembling a typical 28-105mm zoom, this new AF 28-200mm Super Zoom f/3.8-five.6 Aspherical XR [IF] Macro is probable to become fifty-fifty more pop amidst hikers, families, and travelers who desire to carry the most compact gear.





With the new Pentax MZ-S, the autofocus performance of the Tamron XR [IF] zoom was quite adept, even with moving subjects. Internal focus plus a very short rotation from 1 distance setting to another helped to clinch reliable tracking. (At 200mm; Fujichrome 100F.)


New Structure

In addition to the almost v oz reduction in weight and i less optical element, an entirely new optical formula was developed, employing both XR (Actress Refractive Index) glass plus a three-lens complex aspherical element configuration.

The XR element is used to correct chromatic abnormality at long focal lengths for college sharpness and better color rendition. Aspherical elements compensate spherical aberration at shorter focal lengths for college edge sharpness and also control butt distortion (the bowing outward of lines most the edge of the frame). This dual approach is important because the inherent optical flaws are quite unlike at short and long focal lengths; both take been addressed in this lens.

The previous Super 2 model employed a double focus cam blazon of mechanical construction to optimize the movement of internal elements. Accord-ing to Tamron, the new zoom incorporates a moving triple cam with a two-stride extension; because it’s not fixed every bit in other lenses, the entire mechanism moves with the zoom activity. They too claim that every component of the lens was carefully selected for high precision, reduced weight, and high strength.

The Super Ii model offered a Minimum Focusing Ability (MFA) of 19.3″ at all focal lengths, an impressive capability for a zoom of this type. Though much smaller, the XR [IF] version maintains this ability and the maximum magnification of 0.25x. The aperture contains an actress blade (for a total of seven) enhancing the blurred groundwork issue in loftier magnification and in wide aperture telephoto images. The result is that out-of-focus highlights are closer to round than hexagonal.


Other Benefits

Like the Super II model, the XR [IF] zoom incorporates several amenities. Starting time is a focus lock mechanism, to preclude “zoom creep” while it’south pointed up or downwardly; frankly, this was non necessary since the zoom activeness is fairly stiff. The removable lens hood is corner cutting to minimize the risk of flare at all focal lengths. It’due south essential to mount the lens hood correctly, with the Tamron logo at the top, and then it does not intrude into the paradigm surface area.

Thanks to the Internal Focusing (IF) mechanism, the butt does not extend when focusing even at short distances and the front chemical element does not rotate. An IF mechanism likewise helps minimize loss of low-cal at the motion picture plane and to maximize image brightness at the corners of the frame. The 2-part internal barrel does extend when zooming, increasing the overall length of this lens past 2″ at the 200mm focal length.

Other features worth noting include an attractive new exterior with pearl-black coating, plus a chrome ring that adds a bear upon of form to this affordable lens. A model in “argent chrome” finish is also bachelor, to friction match the many current SLR cameras which characteristic components of a like color. At that place’southward a wide zoom and a narrow focus band, both rubberized and more effectively ribbed for better grip. A rotation of a mere thirty changes focus from xix.3″ to infinity, helping to clinch quick focus acquisition. The altitude scale shows both anxiety and meters merely there’southward no depth of field scale, a typical omission with zoom lenses. The mount is made of stainless steel.


General Evaluation

During the summer, I shot some 20 rolls of slide pic with this zoom lens, during parades, at jousting, equestrian and Ceremonious War events, and for family and travel photography. Autofocus functioning was acceptably tranquility, with a high pitched hum typical of many independent brand lenses. At an equestrian outcome, autofocus was adequately quick to go along up with the motion of approaching horses when I used this lens with a Pentax MZ-S in Continuous AF. Manual focusing was besides convenient, because the mechanism is smooth and very well damped, with plenty friction for a familiar experience.

I really appreciated the IF system when using a polarizer to enrich blue skies or to remove glare from the surface of a lake. Considering the front element does not rotate, the upshot of the filter was not altered during focus (or zooming) functioning. The corner-cut lens hood worked well, but was most effective at shorter focal lengths, like whatsoever hood on a broad-range zoom lens. In farthermost sidelighting, at a mid-morning parade, I occasionally needed to alter my shooting position slightly when flare was noticeable on the viewing screen.

I noticed some light falloff (slight darkening of the corners of my slides) at wide apertures, peculiarly at shorter focal lengths, when a polarized sky filled the frame. This is common with wide range zooms. With this model, it may be acquired by the narrower diameter of the front chemical element. Nevertheless, I applaud the designers for the smaller size because the lens accepts 62mm filters, instead of the more than expensive (and less common) 72mm size of its predecessor.

I tin certainly understand why the 28-200mm range has become so pop; a zoom of this type incorporates the focal lengths I use some 75 percent of the time in travel and people photography. While working from a fixed position, I rarely needed to switch to a shorter or longer lens. I could vary framing instantly for a diversity of compositions.


Optical Evaluation

While viewing my slides nether a 4x and an 8x loupe, I made the following notes every bit to this lens’ optical potential. Most notable is the consistency of image quality at all apertures from the widest to f/sixteen, a sign of well-designed eyes. Except in extreme shut focusing, there’s really no demand to finish downwards to apertures smaller than f/5.six; this allowed me to shoot at high shutter speeds to prevent blur from photographic camera or subject motion. I noticed very little barrel distortion or pincushion distortion: lines near the edges of the frame are rendered quite accurately even at 28mm and at 200mm.

At normal focusing distances, summit operation was provided in the 28-100mm range, acceptable for a abrupt 8×12″ print, with crisp definition of details across the frame, every bit well equally fine clarity, contrast, and colour rendition. Performance in the 100-150mm range is virtually equally good; central sharpness is loftier, adequate for a fine 8×12 impress. At the longest focal lengths, the slides would brand for very precipitous 4×6″ prints, very skillful 5x7s, and acceptable 8x10s especially when the primary subject field is centered. According to my favorite high-volume photofinisher, less than two percent of negatives are ever enlarged across the 5×7″ size and this lens is not intended for professional applications.

The close focusing ability proved very useful to fill the frame with large Clamatis blossoms and for farthermost shut-ups of our family felines. I was pleasantly surprised at the high image quality fifty-fifty at the 200mm focal length–especially in the f/11-f/22 range typically required to maximize the range of precipitous focus. At these apertures, any noticeable reduction in sharpness was due to shallow depth of field, and not caused by optical flaws.


Final Assessment

Every bit with any brand, the premium-grade zooms in a line–such equally Tamron’south AF 28-105mm and seventy-210mm f/two.8 models–ever receive the highest ratings. Even so, such lenses are hefty, big, and far more expensive, then they’re less practical for family and travel photography. Also, they rarely cover all of the focal lengths that most folks want, so that means ownership–and carrying–two lenses. Understandably, there’s a much higher demand for convenience zooms, and the AF 28-200mm Super Zoom f/iii.eight-5.6 Aspherical XR [IF] Macro will run into the needs and expectations of many consumers.

The Tamron designers take accomplished what some others had considered incommunicable. They created a wide range zoom lens in an amazingly small/lightweight package with competitive functioning and first-class close focusing power. The optical and mechanical innovations certainly deserve the accolades they accept already received. If you lot’re interested in versatility and maximum portability, do check out this new Tamron zoom. The combination of its many features, unique construction, plus satisfying image quality should keep this lens on the best seller list for years to come.

For more than information, contact Tamron Us, Inc. at (800) 827-8880; fax: (800) 767-5550; world wide web.tamron.com

Technical Specifications

Bending Of View:
75-12
Maximum Aperture:
f/three.eight-f/5.half dozen
Structure:
15 elements in 14 groups

Minimum Focus Altitude:
19.3″ (0.49 meters) at all focal lengths
Maximum Magnification:
0.25x at 200mm
Filter Size:
62mm
Dimensions:
3×2.8″ (75.2x71mm)

Weight:
12.five oz (354 thou)

AF Mounts:
Canon, Minolta, Nikon D, Pentax
Price:
MSRP $562

Source: https://www.shutterbug.com/content/tamron-af-28-200mm-super-zoom-f38-56-aspherical-xr-if-macrobrthe-worlds-best-selling-zoom-le