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
3 July 2017

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.

28 May 2015

Those looking for a budget circular fisheye could do a lot worse than this lens. It offers excellent sharpness in the centre of the image circle for a decent price. The build quality and handling do leave some room for improvement, but this may be easy to look by, especially considering the image...

  • +

    Excellent sharpness in the centre of the image circle, 185-degree angle of view, Lightweight, Well priced

  • -

    Gritty focus ring, Loose feeling aperture ring

User Reviews
B h photo.32817553
28 December 2014

No, it's not a Canon "L" series lens, nor does it weigh as cost as much as one. My 5 star rating is simply based on how well it does the job its intended for, at its price point. Note that though it will mount on a full frame Canon body, the image circle will only fill the frame for an APS-C size...

9 June 2017

There is a learning curve, but this is a fun lens. I frequently use my D300 on all manual, so those settings didn't bother me in the least. Most difficult task is to make sure you don't capture your own feet or hands in the photo, but once you learn to watch for that, you can really see things in a...

B h photo.32817553
1 week ago

Good lens for the money got this as a play around lens makes good images hoping to use it moreon some upcoming projects

3 weeks ago

Having a lot of fun with this lens. Images are sharp and contrasty. Better than my Canon 10-18. This lends itself to a lot of creativity.

B h photo.32817553
13 June 2017

Is it the best ever fish eye? No. Is it the easiest to use? No. Are the pictures any good. They areentirely usable, depending on your purposes. One needs to understand the limitations, it iscompletely manual, the camera body does not even know it is on the camera.

B h photo.32817553
15 March 2017

Good bargain for a novelty lems. The build is substantial, but the images are a little soft which is not a huge problem on a circular image.

B h photo.32817553
2 March 2017

I was worried at first when I saw the image on my cameras view screen so small. viewfinder is easier to see and with a good contrasting peaking color I could see focus and depth of field well enough to get very good shots my first time using a fisheye. I am also new to using fully manual.

12 February 2017

Horrendous, and I mean horrendous lens flare. If you are considering this for astro work, just don't. This used to be reasonable value lens, every week the price keeps going up and up. It is now in the territory, or exceeding the price of Samyangs etc. This lens doesn't come close to a Samyang lens.

B h photo.32817553
7 February 2017

I wanted to use this lens for hemispherical video projection. It shows the full image circle for 1920 HD video, which is what I wanted it for. It's not as sharp as I was led to believe, but still pretty good.

B h photo.32817553
15 December 2016

I got the lens to stitch 2 images shot on an Olympus OMD EM5-2 after 180 degree rotation into a VR image, but the pictures I shot were not circular. Top and bottom cropped off. I contacted the manufacturer who told me that was because .it's not a full frame sensor.

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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