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Sigma Wide Angle 28mm f/1.8 EX Aspherical DG DF Macro Autofocus Lens for Pentax AF

B&H # SI2818MPAF MFR # 440109
Sigma W/A 28mm f/1.8 EX Aspherical DG DF Macro AF Lens for Pentax

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This 28mm lens has a fast f/1.8 maximum aperture, with macro-focusing capability. It features minimum focusing, down to 7.9" with a reproduction ratio of 1:2.9). The 9-bladed aperture diaphragm obtains beautiful out of focus images. It incorporates the floating focus system and the use of two aspherical lens elements to minimize distortion, spherical aberration and astigmatism. The lens incorporates minimum vignetting optical construction in order to obtain adequate peripheral brightness with open aperture. Internal focus system of the lens eliminates front lens rotation, thus allowing the use of a perfect hood and easy use of polarizing filters. The lens also incorporates a dual-focus mechanism. It is easy to hold the lens, since focusing ring does not rotate during autofocus, yet provides adequate torque of the focusing ring during manual focusing. The lens materials used in this new lens are lead- and arsenic-free ecological glass.

UPC: 085126440459
Performance
Focal Length 28mm
Aperture Maximum: f/1.8
Minimum: f/22
Camera Mount Type Pentax (PK Mount)
Format Compatibility Pentax Digital (APS-C)
Angle of View 75.4°
Minimum Focus Distance 7.9" (20.07 cm)
Magnification 0.34x
Maximum Reproduction Ratio 1:3
Elements/Groups 10/9
Diaphragm Blades 9
Features
Image Stabilization No
Autofocus Yes
Tripod Collar No
Physical
Filter Thread 77 mm
Dimensions (DxL) Approx. 3.3 x 3.1" (8.38 x 7.87 cm)
Weight 1.06 lb (480 g)
Packaging Info
Box Dimensions (LxWxH) 5.6 x 5.1 x 5.1"
Sigma Wide Angle 28mm f/1.8 EX Aspherical DG DF Macro Autofocus Lens for Pentax AF
  • Front & Rear Lenscaps
  • Hood
  • Case
  • Limited 1-Year North and South America Warranty Against Manufacturing and Workmanship Defects.
  • Limited 3-Year U.S.A. Extended Warranty Extension Against Manufacturing and Workmanship Defects.
  • REVIEW SNAPSHOT®

    by PowerReviews
    SigmaW/A 28mm f/1.8 EX Aspherical DG DF Macro AF Lens for Pentax
     
    4.7

    (based on 3 reviews)

    Ratings Distribution

    • 5 Stars

       

      (2)

    • 4 Stars

       

      (1)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    Reviewed by 3 customers

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    5.0

    Excellent Lens

    By Michael

    from Placerville, California

    Comments about Sigma W/A 28mm f/1.8 EX Aspherical DG DF Macro AF Lens for Pentax:

    This lens with 1.8f is great for indoors with or without lighting. I'm impressed. Glad I got it before it was discontinued.

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    (0 of 5 customers found this review helpful)

     
    5.0

    Great Fast Lens

    By Eric

    from Fenton, MI

    About Me Semi-pro Photographer

    Verified Buyer

    Pros

    • Durable
    • Nice Bokeh
    • Rugged
    • Strong Construction

    Cons

    • Heavy

    Best Uses

    • Indoors/Low Light
    • Night Photography

    Comments about Sigma W/A 28mm f/1.8 EX Aspherical DG DF Macro AF Lens for Pentax:

    I've had a chance to use it a few times now and I'm very impressed with it.

    • Was this a gift?:
    • No

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    (3 of 3 customers found this review helpful)

     
    4.0

    Sharp at close range

    By Vigfus

    from Reykjavik, Iceland

    About Me Photo Enthusiast

    Verified Buyer

    Pros

    • Nice Bokeh
    • Sharp
    • Strong Construction

    Cons

    • Not dust- or weatherproof
    • Old - school auto focus

    Best Uses

    • Indoors/Low Light
    • Portraits
    • Walkaround

    Comments about Sigma W/A 28mm f/1.8 EX Aspherical DG DF Macro AF Lens for Pentax:

    A good lens for portraits, close ups and low light situations. Focal length is suitable for a great variety of applications. Extremely sharp at close range (< 1 m). Excellent value for the money.
    However, the gaps on the focus-clutch seem fairly inviting to dirt and water, which limits the advantage of having a dust- and weathersealed Pentax K200D.

    • Was this a gift?:
    • No

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    Filters & Filter Kits

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    Hoya - 77mm UV Haze NXT HMC Filter
    • You Pay: $53.90
     
    Hoya - 77mm NXT Circular Polarizer Filter
    • You Pay: $86.45
     

    Filter Holders

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    XUME - 77mm Lens Adapter and Filter Holder Starter Kit
    • You Pay: $56.85
     

    Hoods & Covers

    Flex Lens Shade - Flex Lens Shade
    • You Pay: $39.95
     

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    Pearstone - Onyx 10 Lens Case
    • You Pay: $11.99
     

    Lens Caps

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    Sensei - 77mm Clip-On Lens Cap
    • You Pay: $3.95
     

    Macro Ringbox

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    • You Pay: $89.95
     
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