The Pentax Q 03 Fish-eye (3.2mm, f/5.6) lens is one of the so-called "Unique Lenses" (I prefer to call them all "toy lenses" though) for Pentax Q cameras. I got the 03 lens for my Pentax Q (just for fun).
The lens is tiny.
It is an electronic lens with manual focus. It lacks a built-in leaf shutter and aperture control. Therefore, it behaves similarly to that of a manual focus lens with an adapter, with a few exceptions. First, a Pentax Q camera saves EXIF data with lens information (including the permanent f/5.6 aperture value). Second, a Pentax Q camera recognizes the focal length (3.2mm) for the sensor-shift image stabilization (SR).
The focusing ring is mechanical, but overly sensitive. There is no distance scale, and the ring rotates far past the infinity (which is also unmarked). The depth of field is large, focusing is difficult.
The lens has 6 elements in 5 groups. Overall, the image quality is rather poor. However, the lens has a fairly large angle of view. And, of course, as expected for a fish-eye lens, there is strong barrel distortion.
See also related notes:
- Pentax Q "Unique Lenses" (2025-09-19)
- Fish-eyes: Risespray 11/2.8 (FF) vs Pentax Q 03 3.2/5.6 (1/2.3") (2025-08-27)
- Pentax Q 07 11.5/9 Mount Shield Lens (2025-08-21)
- Pentax Q 03, 04, 05 lenses (2025-07-27)
- Pentax Q 05 18/8 Toy Lens Telephoto (2025-07-05)
- Pentax Q 04 6.3/7.1 Toy Lens Wide (2025-06-13)
- Pentax Q 03 3.2/5.6 Fish-eye: Samples [1] - 1/2.3" - f/5.6 (2025-05-29)
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