Pentax K100D  type_Digital Camera 8 Macro USM is a

8 Macro USM is a macro lens for Canon EF-S mount digital SLR cameras that provides 1:1 magnification without the use of extension tubes

any lens with an 82mm diameter (or 77mm with the included stepping ring)

automatic exposure and focusing (with manual overrides)

though I am not totally convinced

Just going to restate here so it's obvious: there's a mistake in the labeling of these cameras

Pentax K100D &nbsptype_Digital Camera 8 Macro USM is aThe Pentax K100D is a K mount APS C format camera with shutter speeds from 30s to 1 4000s. It has a 6 megapixel CCD sensor with a built in shake reduction system and, perhaps best of all, runs on 4 standard AA batteries. Compatible with nearly all Pentax K mount lenses, manual or autofocus. This one has just under 20k actuations and is in excellent cosmetic condition, with only minor wear.