Pentax DA 50mm F1.8 Lens

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Designed for exclusive use with K-mount interchangeable-lens digital cameras, this unifocal Pentax DA 50mm F1.8 Lens is a medium-telephoto lens that features a large maximum aperture and a round diaphragm to produce a natural, beautiful bokeh (out-of-focus) effect, making it ideal for portraits and casual snapshots.

Its outstanding performance and compact, lightweight design also make it handy for photographers of all levels - from interchangeable-lens digital camera beginners to discerning, experienced photographers.

  • Super multi coated elements increases transmittance
  • ‘Super Protection’ lens coating repels water and dust
  • Quick-shift focus system speeds focus control
  • Rounded diaphragm for beautiful bokeh
  • Compact and light weight design


High-quality image description
Thanks to state-of-the-art PENTAX optical design technology, the image circle of the lens has been optimized for K-mount interchangeable-lens digital cameras to effectively compensate astigmatism for sharp, clear images.

Easy-to-handle medium-telephoto lens
When mounted on a PENTAX K-mount interchangeable-lens digital camera body, this medium-telephoto lens offers a focal length of approximately 76.5mm in the 35mm format, offering a moderate-telephoto perspective perfect for portraiture with a smooth, beautiful bokeh effect in the background and snapshots cropping a part of the subject. Its front surface is treated with the PENTAX-original SP (Super Protect) Coating to not only repel dust, water and grease, but also allow easy removal of grease adhering to the surface. This means worry-free use in all kinds of shooting locations.

Large maximum aperture
Thanks to its large F1.8 maximum aperture, the lens can easily produce images with a very shallow depth of field. Its round diaphragm produces a natural, beautiful bokeh effect, while minimizing streaking of point light sources. The large aperture also makes it possible to use faster shutter speeds under poor lighting conditions to minimize the risk of camera shake and subject shake.

Compact, lightweight design
Measuring a mere 38.5 millimeters in length and weighing just 122 grams, this lens has the compact, lightweight design that lets it come along on every outing. Its solid, refined appearance matches the design of a top-class camera body.


Series smc DA
Equivalent to 35mm format 50mm (Equivalent  76.5mm in 35mm format)
Maximum aperture F1.8
Minimum aperture F22
Number of diaphragm blades 7
Angle of view 31.5°
Construction 6 elements in 5 groups
Smallest object distance/magnification 0.45m
Magnification 0.15X
Filter size 52mm
Weight 122g
Dimensions (Length x Diameter) 63 x 38.5mm