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Pentax SMC K 135 mm f/ 2.5 Lens

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Pentax SMC K 135 mm f/ 2.5 lens

Pentax SMC K 135 mm f/ 2.5 lens

Optical design

Pentax SMC K 135 mm f/ 2.5 optical design

Format: 35mm SLR

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: Pentax K

First year of production: 1975

Last year of production: 1985

Optical design: 6 elements in 6 groups

User reviews (1)

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Owners (2)

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Average price: $317


Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)

Additional information:


The PentaxSMC K 135 mm f/ 2.5  is a telephoto prime lens with a proprietary multicoating for 35 mm SLR Pentax K cameras.

Links to online resources:
Posted by: Eugeny   Date of publication: 25.08.2011

Mechanical quality0.000
Optical quality0.000
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Overall lens rating

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Owner reviews: Pentax SMC K 135 mm f/ 2.5

Leo Koikov 23.01.2018 02:48:12
Period of use: 1 month


Sharpness wide open

Color and contrast


500g (but balances pretty well)

No Manual-Auto switch on my copy, so the pin does not allow changing aperture on digital body w/o modifications:   


I've got an earlier SMC PENTAX 1:2.5/135 version (1975-1977) as opposed to smc PENTAX 1:2.5/135 (1977-1985). Both versions are considered the sharpest wide open 135mm lense ever made with excellent color reproduction. It surpasses Super-Multi-Coated Takumar 1:2.5 135mm (M42). 

135mm Lens War: