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Pentax HD DA 40mm f/2.8 Limited

The Pentax 40mm f/2.8 is a 40mm f/2.8 lens designed for Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Pentax HD DA 40mm f/2.8 Limited

Pentax HD DA 40mm f/2.8 Limited

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Lens Overview — Pentax 40mm f/2.8

The Pentax HD DA 40mm f/2.8 Limited is a compact prime lens built for the Pentax K mount, designed specifically for APS-C format DSLRs. Its pancake form factor is one of its most immediately appealing characteristics — at just 80g, it's an exceptionally light option for photographers who want to keep their kit minimal without sacrificing a capable maximum aperture of f/2.8. That aperture gives you a solid foundation for shooting in lower light or separating subjects from backgrounds, all in a lens that barely adds any bulk to the camera body.

The 40mm focal length sits in standard territory, making it a natural choice for everyday shooting across a range of subjects. The lens supports both autofocus and manual focus, offering flexibility depending on your shooting style or situation. With a 49mm filter thread, it's compatible with a wide range of compact, affordable filters.

The Pentax K mount is a long-standing system with broad compatibility across Pentax DSLR bodies. Whether you're walking around a city, shooting portraits, or just looking for a lens that disappears into your bag, the HD DA 40mm f/2.8 Limited's combination of weight, aperture, and focal length make it a compelling standard prime option within the Pentax ecosystem.

Key Features — Pentax 40mm f/2.8

Pancake Form Factor: One of the slimmest lenses available for Pentax DSLRs, keeping the overall camera profile minimal and highly portable.

80g Ultralight Build: At just 80g, it adds virtually no noticeable weight to a camera body, making it ideal for all-day carry.

40mm Standard Focal Length: Equivalent to approximately 61mm on APS-C, offering a natural field of view well-suited to everyday and street photography.

f/2.8 Maximum Aperture: Provides solid light-gathering capability and background separation in a lens of this compact size.

HD Lens Coating: Pentax's HD coating reduces flare and ghosting for improved contrast and clarity in high-contrast lighting situations.

Autofocus with Manual Override: Supports both AF and MF shooting, giving photographers flexibility across different shooting scenarios.

Lens Specifications — Pentax 40mm f/2.8

Pentax 40mm f/2.8 full specifications
SpecDetail
Use CasesTravel
Lens TypePancake
FormatAPS-C
Zoom/PrimePrime
Focal Length40mm
Maximum Aperturef/2.8
Camera SystemDSLR
Lens MountPentax K
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationNone
Filter Thread49mm

Description — Pentax 40mm f/2.8

The Pentax HD DA 40mm f/2.8 Limited is a prime, pancake-style lens built for Pentax K mount APS-C DSLRs. Tipping the scales at just 80g, it's designed for photographers who prioritize portability without giving up a useful f/2.8 maximum aperture. The 40mm focal length places it squarely in standard range territory — a versatile choice for everyday subjects.

Both autofocus and manual focus are supported, giving shooters control over how they approach focus in different situations. The 49mm filter thread keeps accessory costs low and the overall package compact. With no image stabilization on board, the lens keeps its design simple and its weight minimal, leaning on the inherent steadiness of a pancake form factor and the photographer's own technique.

For Pentax DSLR users looking for a lightweight, pocketable prime with a standard focal length, the HD DA 40mm f/2.8 Limited is a purpose-built option that delivers a capable aperture in one of the smallest possible packages.

Pros — Pentax 40mm f/2.8

  • ✓Ultralight at just 80g — one of the lightest options in the Pentax DSLR lineup
  • ✓Pancake form factor keeps the overall camera profile extremely slim and portable
  • ✓f/2.8 maximum aperture offers useful light-gathering capability for a lens this compact

Cons — Pentax 40mm f/2.8

  • ✗No image stabilization, which may be limiting in low-light handheld situations
  • ✗Fixed 40mm focal length offers no zoom flexibility
  • ✗f/2.8 maximum aperture, while solid for a pancake, is slower than some competing primes

Reviews — Pentax 40mm f/2.8

Videos — Pentax 40mm f/2.8

Pentax DA 40mm and 70mm lens review — Gordon Laing

Resources & Downloads — Pentax 40mm f/2.8

Manuals & Guides

Frequently Asked Questions — Pentax 40mm f/2.8

What camera mount does the Pentax HD DA 40mm f/2.8 Limited use?+
This lens uses the Pentax K mount, making it compatible with Pentax K mount DSLR camera bodies. It is designed for APS-C format sensors.
Does this lens have image stabilization?+
No, the HD DA 40mm f/2.8 Limited does not include optical image stabilization. If stabilization is needed, it would need to come from in-body stabilization in the camera body itself.
How light is this lens, and is it practical for travel?+
The lens weighs just 80g and features a pancake design, making it one of the most travel-friendly options available for Pentax DSLR shooters. Its slim profile adds very little bulk to the camera.
Does this lens support autofocus?+
Yes, the lens supports both autofocus and manual focus operation. This allows you to switch between AF for quick, hands-free focusing and manual focus when more precise control is needed.
What filter size does this lens accept?+
The Pentax HD DA 40mm f/2.8 Limited has a 49mm filter thread, which is a compact and common size that makes it easy to find compatible filters at reasonable prices.

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