The Pentax Q 05 Toy Lens Telephoto (18mm, f/8) is another lens from the so-called "Unique Lenses" series for Pentax Q cameras. This is the third lens from this series that I have purchased for my Pentax Q, after the Q 03 Fish-Eye and the Q 04 Toy Lens Wide. On the Pentax Q (1/2.3"), it is equivalent to a 100mm lens.
The Q 05 is smaller than the Q 03 Fish-Eye or Q 04 Toy Lens Wide, but has a slower aperture (f/8 vs f/5.6 or f/7.1).
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/8 aperture value). Second, a Pentax Q camera recognizes the focal length (18mm) 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 3 elements in 3 groups. By the way, I am unsure if the Q 05 lens is a true telephoto lens. It could just be a "conventional" long-focus lens.
The simple optical design and diffraction due to the slow aperture result in poor image quality.
The long focal length requires a fast shutter speed (my Pentax Q uses a 1/100 limit for Auto ISO). With an aperture of f/8, it tends to use a high ISO even in fairly well-lit conditions. Another problem is that it produces low-contrast images (it reminds me of old uncoated lenses). These problems will result in a lot of noise in processed images.
This lens is called the "Toy Lens" because its image quality resembles that of cheap plastic "toy" film cameras.
See also related notes:
- Pentax Q "Unique Lenses" (2025-09-19)
- Pentax Q 07 11.5/9 Mount Shield Lens: Samples [1] - 1/2.3" - f/9 (2025-09-05)
- 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: Samples [1] - 1/2.3" - f/8 (2025-07-17)
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