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PENTAX
PENTAX 21387 DA 16-85mm f/3.5-5.6 ED DC WR camera lens
Versatile 16-85mm zoom with weather-resistant construction, HD and SP coatings, and 72mm filter thread for Pentax K-mount DSLRs
- TypeZoom Lens
- ColorBlack
- Diameter72 mm
- Focus TypeAuto Focus
- Focal Length16 - 85 mm
- ApertureMaximum: f/3.5 - 5.6 Minimum: f/22 - 38
- Versatile 5.3× zoom covers 24.5-130mm equivalent range
- HD coating maximises light transmission and cuts reflections
- Weather-resistant construction handles damp conditions reliably
- Quick-shift focus allows instant manual override anytime
- Compact 17.2 oz design keeps kit light
Pentax KAF3 zoom lens
The HD Pentax-DA 16-85mm f/3.5-5.6 ED DC WR covers a 24.5-130mm equivalent focal range on APS-C bodies. Its 5.3x zoom spans wide landscapes through to short telephoto portraits in a single weather-resistant barrel. Autofocus is driven by a DC motor with quick-shift manual override for immediate tactile control. The 72 mm filter thread accepts standard circular filters and the supplied PH-RBA hood.
Upgrade from fixed focal length or kit zoom
Photographers carrying a prime or a shorter kit zoom gain continuous 16-85mm coverage without swapping glass. The jump is worth it when a single lens must handle architecture, street scenes and candid portraits in changing light. The variable f/3.5-5.6 aperture and 0.26x maximum magnification limit low-light subject isolation and close-up detail work. Buyers needing constant f/2.8 brightness or 1:1 macro reproduction will not find them here.
KAF3 mount and variable aperture constraints
The lens mounts only on Pentax KAF3-compatible DSLRs and transmits aperture electronically; no mechanical aperture ring is present. At 85mm the maximum aperture narrows to f/5.6, reducing viewfinder brightness and requiring higher ISO or slower shutter speeds indoors. Minimum focus distance is 1.15 ft (0.35 m) across the zoom range, yielding 0.26x magnification at the long end. The 16-element, 12-group design with ED and aspherical elements controls aberrations, yet diffraction softens detail beyond f/22-38.
Highlights
- Versatile 5.3× zoom covers 24.5-130mm equivalent range
- HD coating maximises light transmission and cuts reflections
- Weather-resistant construction handles damp conditions reliably
- Quick-shift focus allows instant manual override anytime
- Compact 17.2 oz design keeps kit light
Specifications
| Brand | PENTAX |
|---|---|
| Model | 21387 |
| Type | Zoom Lens |
| Color | Black |
| Diameter | 72 mm |
| Focus Type | Auto Focus |
| Focal Length | 16 - 85 mm |
| Aperture | Maximum: f/3.5 - 5.6 Minimum: f/22 - 38 |
| Camera Mount | PENTAX KAF3 |
| Angle of View | 83-19 degrees |
| Minimum Focus Distance | 1.15' (.35m) |
| Magnification | 0.26x |
| Lens Construction | 16 elements in 12 groups |
| Filter thread (Diameter) | 72 mm |
| Specifications | FOCAL LENGTH: 16-85mm (equiv. 24.5-130mm) LENS APERTURE RING: n/a TRIPOD ADAPTER: n/a HOOD: PH-RBA 72mm OBJECTIVE CAP: O-LC72 CASE: S90-140 NOTES: HD Coating, SP (Super Protect) Coating, Weather-Resistant,Quick-shift Focus, Filter Window. |
| Autofocus | Yes |
| Features | New HD (High-Definition) Coating optimizes light transmission and minimizes reflection. Weather resistant to handle damp, inclement conditions. Versatile zoom range PENTAX SP coating protects the exposed lens elements ED glass optical elements for outstanding performance Developed specifically for PENTAX DSLRs Focal length equivalent to 24.5mm to 130mm in the 35mm format |
| Dimensions | 3.70" x 3.10" |
| Weight | (W/O HOOD): 17.2 oz. (W/ HOOD): 18.2 oz. |
| Shipping weight | 1.42 kg |
| Package size | 218 × 178 × 137 mm |
Questions about this item
Will the 72 mm filter thread accept my circular polariser without vignetting at 16 mm?
The front thread is 72 mm; the supplied PH-RBA 72 mm hood is designed for the full 16-85 mm range, so a slim 72 mm filter fits behind it without vignetting.
Does the lens mount directly onto a Pentax K-70 without an adapter, and which way does the focus ring turn?
It uses the native KAF3 bayonet — align the red dot, twist clockwise until it clicks; the focus ring rotates counter-clockwise for closer focus when autofocus is engaged.
How often should I clean the SP-coated front element and is the hood replaceable?
The SP coating repels water and oil; wipe only when visible smudges appear using a microfibre cloth. The PH-RBA 72 mm hood is a standard part (S90-140 case compatible) and can be ordered separately if lost.
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