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Pentax 100mm F/4 SMC K Mount Manual Focus Lens K Mount Manual Focus Lens (Requires Bellows) {52}

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* Item pictured for illustrative purposes only, actual item not pictured.

Pentax 100mm F/4 SMC K Mount Manual Focus Lens K Mount Manual Focus Lens (Requires Bellows) {52} Description


A "bellows" lens has no focusing ring on the lens. It must me used with an extension tube or a bellows. The bellows will allow focusing to infinity and can sometime allow 3:1 ratio. That means 3 times normal size to the film or sensor. 

KEH Specifications

  • Focal Length: 100mm
  • Aperture Maximum: f/4
  • Aperture Minimum: f/32
  • Camera Mount Type: Pentax K Bayonet (Short Barrel, requires bellows)
  • Format Compatibility: 35mm
  • Minimum Focus Distance: N/A
  • Elements/Groups: 5/3
  • Diaphragm Blades: 6
  • Tripod Collar: No
  • Filter Thread: 52mm
  • Dimensions: 2.36 x 1.57 inches
  • Weight: 6.53 oz (185g)


Physical Characteristics

Lens Mount Pentax K (SMC, SMC-M)

General information

Brand Name Pentax

Technical Information

Fixed Focal Length 100 mm
Autofocus No

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