Lensbaby 5.8mm f/3.5 Circular Fisheye Lens for Pentax K


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General Information

Focal Length 5.8 mm
Aperture Maximum: f/3.5
Minimum: f/22
Camera Mount Type Pentax K
Format Compatibility Full frame
Minimum Focus Distance 0.25" / 0.6 cm
Angle of View 185°
Filter Size None
Dimensions 2.75 x 3.0" / 7.0 x 7.6 cm
Weight 10.5 oz / 298 g
Expert Reviews
26 December 2014

If you shoot nothing but fisheye and want full AE and AF control, then a dedicated fisheye lens is the way to go. But if you want to have the occasional fisheye fling this might be your cup of tea.

19 June 2015

This circular fisheye lens from Lensbaby is available to fit Canon, Nikon, Pentax, Sony, Samsung and Micro Four Thirds cameras. It offers an extremely wide field of view of 185 degrees, with the barrel distortion effect you'd normally expect from a fisheye lens.

User Reviews
B h photo.32817553
9 December 2015

The lens is not bad for the price, but it' not a full frame lens. Other that that it is still usable with my full frame camera. I had to set my Sony a7r to crop C. The imaging and sharpness are good. I am not sorry that I bought this lens because this completes my lenses.

  • +

    Lightweight, Strong Construction

20 May 2014

Except for a somewhat flimsy front lens cap, this lens fully met my expectations - especially for its cost!The images are acceptably sharp(again considering its price).It's a fun lens to use. Just be careful where you place your fingers and toes.

  • +

    Optics Reasonably Sharp

  • -

    Flimsy Front Lens Cap

7 April 2015

Everything I expected and more. Super fun lens. Easy to use. Easy to learn. Hold the camera body well away from your body to keep from getting your feet in the frame!

Product Highlights
  • Full-Circle Image
  • Wide 5.8mm Focal Length
  • Aperture Range of f/3.5-22
  • APS-C & Full Frame Compatibility
  • Close Focusing from 0.25" to Infinity
  • 185˚ Angle of View
  • Focus Distance & DOF Scale
  • Smooth Manual Focusing
  • Creative Flare Effect
  • For Use with Pentax K Mount
Average Expert Score
Average User Score
In The Box
  • Lensbaby 5.8mm f/3.5 Circular Fisheye Lens for Pentax K
  • Front Lens Cap
  • Rear Lens Cap
  • Microfiber Lens Pouch
  • Limited 1-Year Warranty
Still Have Questions?
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