Lens Reviews - System KB Zoom SMC 50-135mm f2.8 (IF) DA SDM

Overview

DESCRIPTION

The PENTAX DA * 50-135mm F2.8 ED (IF) telephoto zoom lens is designed for exclusive use with PENTAX digital SLR cameras, delivering the highest level of ultimate optical image quality. With aspherical elements, special optical-glass elements and original lens coatings, this lens is superior in terms of Contrast, clarity and edge-to-edge sharpness. The 50-135mm features tightly sealed, weather-resistant and dust-resistant construction to enhance durability for use in rain or dusty conditions. A new SDM system has been incorporated for smoother, quieter autofocusing operation using a built-in supersonic motor. It also features the PENTAX-original Quick-Shift Focus System for instant switching to manual-focus operation and PENTAX-original SP (Super Protect) Coating to repel dust, water and grease.

Lens Specifications

Generic Lens Specifications

Lens Type: Zoom
IS / VR / OS: None
Min Focal length (mm): 50
Max Focal Length (mm): 135
Number of Elements: 18
Element Groups: 14
Max Aperture: 2.8
Minimum Aperture: 22
Diaphragm Blades: 9
Closest Focus Distance (m): 1
Maximum Magnification: 0.17
Filter Type: Screw In
Filter Diameter (mm): 67
Diameter at widest (mm): 76
Lens Length (mm): 136
Weight (g): 320

Details

OPTICAL SPECIFICATION

Lens construction: 18 elements in 14 groups
Angle of view: 31.5°-11.9° (when used with DSLR camera body)
Minimum aperture: F22
Minimum focusing distance: 1.0m
Maximum magnification: 0.17X

PHYSICAL SPECIFICATION

Lens mount: PENTAX KAF mount
Aperture control: Automatic
Metering system: TTL open-aperture metering
Number of diaphragm blades: 9
Filter size: 67mm
Dimensions (diameter x length): 76.5 x 136mm Weight: 320g

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User Lens Reviews

Average user rating from: 1 user(s)


Overall rating (weighted)		4.8
Sharpness		4.0
Build Quality		5.0
AF Speed		5.0
Value for Money		5.0

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16 of 16 people found the following review helpful

Great Wedding Lens, Thursday, 15 May 2008


Overall rating (weighted)		4.8
Sharpness		4.0
Build Quality		5.0
AF Speed		5.0
Value for Money		5.0

The construction of this lens is very good for a zoom. Fully internal zoom and focus (the lens doesn't extend or contract) allows the fully weather resistant lens to be out in rain and dust as well as reduces potential damage from impact. Very sharp for a zoom and converts to a 70-200mm on my smaller frame digital K20D. The SDM works great (fast and quiet) and you can adjust the focus right after the auto focus. Much less expensive and lighter than competitors 70-200mm lenses with drive motors.

Why should you care what I think?

My relationship with this item: I own it
Where did you buy this item?: 17th Street Photo
Price paid: 800
When did you buy this item?: April 2008

Conclusions at a glance

Would you recommend this Item: Yes
Pros: Great AF speed, Perfect zoom range, Solid construction, Very sharp
Cons: ?

Was this review helpful to you? yes

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