420-800mm F/8.3-16 Telephoto Zoom Lens+T Mount for Pentax PK K3 K5 K7 K20D K200D | eBay
Used Pentax 6x7 67 Super Telephoto 800mm F/4 Takumar Lens MPL8004
Jintu White 420-800mm F/8.3-f16 Mf Focus Telephoto Zoom Lens + Adapter For Canon Nikon Sony Pentax Olympus Panasonic Fuji Camera - Camera Lenses - AliExpress
Amazon.com : Foto4easy 420-800mm F/8.3-16 Telephoto Zoom Lens with 2 X Teleconverter Lens and T2/T to Pentax PK Mount Adapter Ring for Pentax K-5 K-7 K3 K-1 K50 K3 K10D K20D K200D
Pentax SMC M* 67 800mm F/6.7 ED (IF) STAR Lens w/1.4x Converter *EX+* – AGFCamera
PENTAX 6x7 camera lens 4/800 Mega rare SMC Takumar tele f=800mm cased Mint
Used Pentax 6x7 67 Super Telephoto 800mm F/4 Takumar Lens MPL8004