SMC Pentax Reflex 2000mm F13.5

The SMC Pentax Reflex 2000mm F13.5 has the longest focal length ever produced by Pentax. It is a mirror lens with fixed aperture and features built-in filters. It was later succeeded by an M-series counterpart which did not differ functionally.

SMC Pentax 2000mm F13.5 Reflex © www.pentaxforums.com, sharable with attribution
Image Format Full-frame / 35mm film	Lens Mount Pentax K	Aperture Ring No	Diaphragm None
Optics 6 elements, 4 groups	Mount Variant K Check camera compatibility	Max. Aperture F13.5	Min. Aperture F13.5
Focusing Manual		Min. Focus 2000 cm	Max. Magnification 0.12x
Filter Size 52 mm (Rear drop-in)	Internal Focus Yes	Field of View (Diag. / Horiz.) APS-C: 0.8 ° / 0.7 ° Full frame: 1.2 ° / 1.0 °
Hood Built-in	Case Dedicated trunk case
Lens Cap Leather	Coating SMC	Weather Sealing No	Other Features Built-in Filters,Tripod Mount,Fixed Aperture
Diam x Length 180 x 520 mm	Weight 8000 g	Production Years 1979 to 1982
Engraved Name smc PENTAX REFLEX 1:13.5 2000mm		Product Code 24980	Reviews User reviews
Notes Built-in ND Filters (-1 stop, -1.5 stop, -2 stops). Built-in skylight, yellow and red Filters. Compatible rear converter: A 2X-S, K T6-2X		Variants This M lens is unchanged from the K version