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Pentax 400-600mm F/8-12 SMC Reflex K Mount Manual Focus Lens {40.5}

Pentax Cameras
KEH Model# 242325

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Pentax 400-600mm F/8-12 SMC Reflex K Mount Manual Focus Lens {40.5} Description


A telephoto mirror lens is very similar to a telescope. The image coming through the lens is bounced off of mirrors before going to the image. This allows the lens to be much shorter than it would need to be without the mirrors. The lens has no diaphragm and is normally used with adjusting the shutter speed to reduce light. Many of these have small filters that are attached to the rear of the lens. Neutral density filters are used to reduce light when the shutter speed does not reduce enough. Close-focus tends to be much, much closer than with a standard lens. Hand holding is difficult as with any lens, but will not require a very strong tripod. A monopod is the normal choice. This is a very rare zoom mirror lens. 


Exclusive 40.5mm rear mount filters; (normal, sky, Y8, R60, ND 2x, 2.8x, 4x) Lens Hood: Exclusive-supplied with Lens Lens Case: Hard Case if shown in desription.

The smc Pentax 400mm F8 - 600mm F12 Reflex Zoom is an extremely unique lens. Despite its compact and lightweight design (3.2 x 4.2 inches and 25.7 ounces), the 400mm F8 - 600mm F12 Reflex Zoom provides an incredibles zoom range of 400-600mm, making it ideal for sports and wildlife photography. This high-performance lens is designed for use with manual zoom / focus cameras such as the KA & K Bayonet mount and features 7 rear mount filters (normal, sky, Y8, R60, ND 2x, 2.8x, 4x).

KEH Specifications

  • Focal Length: 400-600mm
  • Aperture Maximum: f/8/12
  • Aperture Minimum: f/8/12
  • Camera Mount Type: Pentax K Bayonet
  • Format Compatibility: 35mm
  • Minimum Focus Distance: 9.84 feet
  • Elements/Groups: 12/7
  • Diaphragm Blades: None
  • Tripod Collar: Yes
  • Filter Thread: 40.5 rear
  • Dimensions: 3.23 x 4.25 inches
  • Weight: 25.75 oz (730g)


General information

Manufacturer Part Number 27940
Manufacture GTIN 027075002883
Brand Name Pentax
Product information
Product Series
Lens Construction
12 Elements in 7 Groups
Product Line

Pentax 35mm SLR Cameras

Maximum Aperture Wide
Maximum Aperture Tele
  • Camera
Lens Type Telephoto Zoom

Technical Information

Zoom Min Focal Length 400.0000
Zoom Max Focal Length 600.0000
Max Aperture f/8-12

Physical Characteristics

Lens Mount Pentax K (SMC, SMC-M)