Tamron Adaptall 28mm f2.5 with Pentax K mount brand_Vivitar thumb-dial focusing and a plunger-style

thumb-dial focusing and a plunger-style film winding system

Please note that "all purpose" in this context means that it's suitable for purposes of photography requiring focal lengths of between 18 and 140mm

It has a single-speed shutter (with Bulb mode) and a focusable (

2mp sensor

The Tokina EL 28mm f2

Tamron Adaptall 28mm f2.5 with Pentax K mount brand_Vivitar thumb-dial focusing and a plunger-styleThe Tamron Adaptall 28mm f2. 5 lens is a solid little lens with a pretty quick f2. 5 aperture and good image quality. Minor internal dust, smooth focusing and diaphragm. Adaptall lenses have interchangeable mounts; this one is supplied with a Pentax K M mount.