Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens

Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens

Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens

B&H # PE284545ED MFR # 26390
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Product Highlights

  • Pentax 645AF2 Mount
  • 22-35.5mm (35mm Equivalent)
  • Aperture Range: f/4.5 to f/32
  • Extra-Low Dispersion Elements
  • DC AF Motor & Quick-Shift Focus System
  • Shake Reduction, Image Stabilization
  • Super Protect, HD & Aero Bright Coatings
  • Dustproof and Weather-Resistant
  • Nine Blade Circular Diaphragm
  • Filter Thread: 82mm
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Pentax DA645 overview

  • 1Description

The HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens from Pentax provides users of the 645D or 645Z with a weather-resistant, ultra wide-angle zoom lens with a 35mm equivalent focal length of 22-35.5mm. This lens features the 645AF2 mount for electronic aperture control and autofocus with an internal DC motor. Also, it has a constant maximum aperture of f/4.5 throughout its zoom range and uses extra-low dispersion glass elements to limit the effects of chromatic aberrations and improve sharpness.

The dustproof and weather-resistant 28-45mm lens features a quick-shift focus system that allows users to quickly switch from auto to manual focus as well as shake reduction image stabilization good for up to approximately 3.5 stops. Further improving image quality is the use of HD and Aero Bright coatings that reduce flare and ghosting. A Super Protect coating on the front element is also utilized to ensure the surface is free of dust and marks.

This lens has nine rounded aperture blades that will provide smooth out-of-focus areas. Additionally, the lens has an 82mm front filter thread and comes with both a case and hood.

Aperture range from f/4.5 to f/32
Pentax 645AF2 mount for full electronic aperture control and autofocus with an internal DC motor
Lens construction features 17 elements in 12 groups
Maximum magnification of 0.21x
All-weather design is both dustproof and water-resistant
Built-in shake reduction technology provides about 3.5 stops of image stabilization
Nine rounded diaphragm blades provide a circular aperture from f/4.5-6.3 at 28mm and from f/4.5-8 at 45mm
Minimum focusing distance of 1.3'
UPC: 027075219861
In the Box
Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens
  • Lens Cap
  • Mount Cap
  • PH-RBC82 Lens Hood
  • S120-210 Lens Case
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Pentax DA645 specs

    Focal Length 28 - 45 mm
    Aperture Maximum: f/4.5
    Minimum: f/32
    Camera Mount Pentax 645
    Angle of View @ Infinity 89° - 63°
    Minimum Focus Distance 1.31' / .4 m
    Diaphragm Blades 9
    Optical Design 17 Elements in 12 Groups
    Magnification 0.21x
    DOF Scale No
    Distance Scale Yes
    Autofocus Yes
    Movements None
    Filter Thread Front: 82 mm
    Dimensions Approx. 3.90 x 5.96" (99 x 151.5 mm)
    Weight 3.24 lb / 1.47 kg
    Packaging Info
    Package Weight 4.3 lb
    Box Dimensions (LxWxH) 8.898 x 7.165 x 5.669"

    Pentax DA645 reviews

    HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens is rated 4.1 out of 5 by 7.
    Rated 4 out of 5 by from HD PENTAX-DA645 28-45mm f/4.5 ED AW SR L Very useful all round wide lens, with very little distortion. Yes, its a big lens but it balances well on the camera. I use it mostly handheld and have been happy. The shake reduction really works and I am confident hand-holding this lens at slow shutter speeds. Combine this with the weatherproofing, incredible file quality and low light iso ability, this is my go-to lens for this system.
    Date published: 2014-12-16
    Rated 5 out of 5 by from Fantastic lens. Fantastic lens. This lens, combined with a 645z, is truly remarkable. I can see it serving well for capturing landscapes, but I use it for documentary. In low light, with the shake reduction enabled, I'm able to hand hold down to an 1/8th of a second at 6400 ISO and still have a print-worthy frame. However, I've found that street lights are often blown out at those levels, so I generally shoot at 1/20th @ f/4.5 (ISO1600) with enough latitude to pull up what I need in the shadows. Despite the f/4.5 max aperture, I've found the autofocus to still serve well at nighttime, too.Things you should know, though.. paired with a 645z, this setup weighs 7-8 lbs, with minimal accessories. It's incredibly well balanced for shooting, but it's about the size and feel of a 70-200 on a FF body w/battery grip. So, if you're expecting the stealth of a Leica M for street photos, look elsewhere. Also, if you're a flash shooter, you'll probably want to wait for the leaf shutter lenses that are due to be released soon.I do think it pairs well with the Pentax-D FA 55 f/2.8, for documentary. I prefer to shoot as close as possible, so for my style, these two lenses give me enough coverage for any situation I've come across. (Though also a very well made lens, I find the DA 25mm f/4 to be a little too wide for my needs.)If you're on the fence about buying this lens, I definitely encourage you to check it out. Along with the 645z, this product deserves five stars, and has so much potential. While the camera market is hyper competitive and constantly evolving, I have yet to find a medium format setup that affords the same versatility. It's not for everybody, but I've found it to work great for me.
    Date published: 2014-12-06
    Rated 4 out of 5 by from Premium wide zoom that pleases; 645Z Practically replaces the 25mm prime lens while offering more versatility without any discernible loss in image quality. The lens is large, heavier than most, has stabilization and wonderful lens coatings that offer an inherent circular polarizer benefit of sorts. The price and very high quality of the lens offers and ROI is particularly attractive compared to other medium format manufacturer and 3rd party wide angle lens offerings. Other lens manufacturer's wide angle lenses in my experience do not offer the same versatility/high quality-to-price ratio. This Pentax lens offers at least on-par if not higher quality and much better ROI for those interested in the money end of things. For Street photography in places like San Francisco, New York city or New Orleans, the Pentax 645 28-45 f/4.5 makes for a hard working, high quality street lens; well controlled distortion, etc. Definitely a bread-and-butter lens in my medium format bag. I wish the stabilization was better, the lens a stop faster (even at the expense of additional heft) and a leaf shutter that can be used automatically when the shutter speed is higher than the horribly crippling1/125th on the 645Z (would require firmware upgrade, etc.), as I use this lens most in a non studio / natural ambient light setting. I would've gladly paid more for those features. Highly recommended!
    Date published: 2016-11-25
    Rated 5 out of 5 by from Prime performance in a zoom First off, this thing is big and heavy. It is as big as a 70-200 f2.8 and not for the weight weenies. Used hand held on a 645z body, it is big and heavy (7lbs) However it balances surprisingly well and with the help of SR delivers sharp images. My primary use for this lens is for landscapes and on a tripod. At f8, it is super sharp all across the frame with no discernible difference between center and edges by f9 - at all focal lengths. At 28mm, it significantly outperforms the 25mm on edge sharpness and at equivalent focal lengths does the same to the 35mm and 45mm prime lenses. There is minor distortion at 28mm that is easily corrected by checking a button in Lightroom. I can mount a regular ring polarizer to the lens and attach a lee filter holder mounted onto a 82mm wide angle adapter with 2 slots without vignetting. The weather sealing when used with a 645z body allows captures in wet/rainy conditions as well as dusty environments - there is a YouTube video showing the capability of the weather sealing of the system. Still can't get over the size of the thing - it is a beast that delivers exceptional quality and in my opinion is top dog in the landscape arena.
    Date published: 2017-01-17
    Rated 3 out of 5 by from Big $$$ average results. We bought this lens to use for interiors, landscapes and the like. Results from this lens, despite its enormous size are mediocre to okay. Distortion and focus fall are bearable but for this sort of money, just not good enough. Some of 20 year old glass for 1/10th the price overshadows this lens.
    Date published: 2015-09-19
    Rated 4 out of 5 by from Premium wide zoom lens that pleases Replaces the 25mm prime lens while offering more versatility without any practical loss in image quality. The lens is large, heavier than most, has stabilization and wonderful lens coatings that offer a sort off circular polarizer benefit. The price of the lens is also cheap compared to what you'd currently have to buy from Phase or Hasselblad, just to get the same versatility of the Pentax lens which offersat least on-par performance. For Street photography in places like San Francisco, New York city or New Orleans, the Pentax 645 28-45 f/4.5 makes for a hard working, high quality street lens; well controlled distortion, etc. This is definitely a bread-and-butter lens in my medium format bag. I wish the stabilization was better and the lens had a leaf shutter that can be used automatically when the shutter speed is higher than the horribly crippling1/125th as I use this lens most in a non studio / natural ambient light setting. I would've gladly paid more for those features. If you shoot for fun, this lens may be considered pricey by many. If you shoot to put money in your pocket, the lens offers a very palatable ROI.
    Date published: 2016-11-23
    Rated 4 out of 5 by from Great Lens--but.. I was using the 645z with this lens in Italy to photograph the interior of various basilicas. The weight caused me no end of difficulty shooting at lower iso. Even with the SR on, I found many out of focus shots. With a tripod it is fantastic; but since they won't let you use a tripod that approach is moot. So, bottom line, next time I'll take my Nikons.
    Date published: 2016-05-26
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