Pentax's twist-body 2004 compact — 5MP CCD, 35.6-107mm equiv f/2.6-4.8, 18mm thin, rotating lens section.
The Pentax Optio X, announced in August 2004, was the design statement of the Optio range: a twist-bodied five-megapixel compact whose lens-and-grip half rotates against the screen half. At just 18mm deep it was the thinnest Optio yet made, built from aluminium alloy with a resin coating.
It houses a 5.0-effective-megapixel CCD behind a relatively fast f/2.6-4.8 zoom covering 35.6-107mm equivalent, using Pentax's Sliding Lens System to retract the optics fully inside the slim body. The lens section rotates 180 degrees upward and 90 degrees downward for waist-level, overhead and self-portrait framing, and a then-new imaging ASIC handled processing. Power comes from the proprietary D-LI8 lithium-ion battery shared with the slim Optio S series.
This one attracts design collectors as much as photographers: the rotating body invites candid street angles and awkward-viewpoint shots that fixed compacts of the era could not manage. The unusual layout takes acclimatisation, and there is no optical viewfinder, so it is a screen-first camera.
On the used market the rotating joint is the obvious inspection point: twist through the full range while watching the screen for flickers, which betray a tired ribbon cable. The D-LI8 battery is proprietary but still widely available from third parties; confirm a charger is present. Check the sliding lens deploys cleanly and the slim body shows no bend or impact damage.