Pentax
Pentax 22137 DA 40mm f/2.8 XS Pancake Lens
★★★★★
f/2.81.8oz
Capture Sharp Images with the Pentax DA 40mm f/2.8 XS LensEnhance your photography with the Pentax DA 40mm f/2.8 XS Lens. This ultra-low-profile lens delivers exceptional image quality and sharpness, perfect for everyday shooting. Focal Length: 40mm Aperture: f/2.8 Mount: Pentax K mount
$169.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
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Overview
Capture Sharp Images with the Pentax DA 40mm f/2.8 XS Lens
Enhance your photography with the Pentax DA 40mm f/2.8 XS Lens. This ultra-low-profile lens delivers exceptional image quality and sharpness, perfect for everyday shooting.
- Focal Length: 40mm
- Aperture: f/2.8
- Mount: Pentax K mount
Key Features
Designed by Marc Newson and with a profile that is .36 inches thin at 1.8oz
Fixed focal length 40mm prime lens is equivalent to 61mm in the 35mm format
Maximum f.28 aperture is ideal for existing light photography and creative depth of field applications
Pentax SP coating protects the exposed lens elements
Pentax KAF mount is compatible with current and past K mount compatible cameras
Specifications
Focal Length
40mm (fixed)
35mm Equivalent Focal Length
61mm
Maximum Aperture
f/2.8
Minimum Aperture
Not specified
Lens Design
Marc Newson
Filter Thread Size
Not specified
Lens Coating
Pentax SP coating
Mount Type
Pentax KAF
Dimensions
0.36 inches thin (profile)
Weight
1.8 oz
Pros & Cons
👍 Pros
- Features an ultra-thin .36-inch profile and light 1.8oz weight, making it highly portable.
- Designed with a fixed 40mm focal length, equivalent to 61mm in 35mm format, ideal for specific compositions.
- The maximum f/2.8 aperture is well-suited for low-light conditions and creating shallow depth of field effects.
- Equipped with a Pentax SP coating which helps protect the exposed lens elements from dust and grime.
- Boasts a Pentax KAF mount, ensuring broad compatibility with a wide range of current and older K mount cameras.
👎 Cons
- As a prime lens, it has a fixed 40mm focal length, which means no optical zoom capability.
- The f/2.8 maximum aperture, while good for existing light, is not as wide as some f/1.8 or f/1.4 primes.
- The lens is designed by Marc Newson, which is a design note, but not a functional photographic benefit.
- Specific information regarding the construction materials beyond its light weight is not provided.
- The lens's suitability for video recording or specific autofocus performance is not detailed in the features.
Frequently Asked Questions
What is the focal length of the Pentax DA 40mm f/2.8 XS Pancake Lens?
The lens has a fixed focal length of 40mm, which is equivalent to 61mm when used on a 35mm format camera.
Is this lens suitable for low-light photography?
Yes, with a maximum aperture of f/2.8, this lens is ideal for existing light photography and applications requiring creative depth of field.
What kind of cameras is this lens compatible with?
This lens features a Pentax KAF mount, ensuring compatibility with both current and past Pentax K mount compatible cameras.
What is the physical size and weight of this pancake lens?
This lens is exceptionally thin with a profile of just .36 inches and weighs only 1.8 oz, making it very compact and lightweight.
Does the lens have any protective coatings?
Yes, the Pentax DA 40mm f/2.8 XS Pancake Lens is equipped with a Pentax SP coating to protect the exposed lens elements.
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