Pentax's enthusiast DSLR without AA filter — the K-5 IIs for maximum sharpness.
The Pentax K-5 IIs is a high-end APS-C DSLR from Pentax, released in 2012 as one of two K-5 II variants. The 'IIs' (lowercase 's') variant removes the optical low-pass filter (OLPF) that is standard on the K-5 II, trading moiré resistance for maximum pixel-level sharpness.
The K-5 IIs uses a 16.3-megapixel APS-C CMOS sensor without an anti-aliasing filter, housed in a weather-sealed body with 77 sealing points. It includes in-body Shake Reduction stabilisation, a maximum shutter speed of 1/8000s, 7fps burst rate, and a 3-inch articulating LCD.
The OLPF removal in the IIs variant produces visibly sharper images in subjects with fine detail — particularly effective in landscape, architecture, and product photography. The risk of moiré patterns in fine-patterned fabrics or regular structures is the trade-off. Pentax's 77-point weather sealing and in-body SR remain compelling differentiators versus Canon and Nikon rivals.
Confirm this is the IIs (no-OLPF) variant rather than the K-5 II (with OLPF) — the distinction should be noted in the listing. Check in-body Shake Reduction operation and verify the shutter count against rated lifespan. Inspect weather seals for integrity and check the sensor surface for dust.