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Pentax M SMC 20mm f/4 : Specifications and Opinions

Lens photo unavailable

The Pentax M SMC 20mm f/4 is a wide-angle lens for FF and APS-C, manufactured from 1977 (discontinued). The focus is done by Manual Focus, it does not have image stabilization.

4 users have given it an average vote of 9.0 out of 10.

Specifications
Focal lenght	20 mm
Angle of view	94.5°
Format	FF, APS-C
Max. aperture	f/4
Aperture blades	5
Lenses/Groups	8 elements in 8 groups
Min. focus distance	0.25 meters
Reproduction ratio	0.12x
Features
Stabilization	No
Focus	Manual Focus
Internal Focus	No
Built and notes
Tripod ring	No
Extenders	No
Filters	49 mm
Lens hood	Yes (not supplied)
Weather sealing	No
Weight	150 g
Dimensions	63 x 29 mm
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Reviews

What do you think about this lens?

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The following opinions have been automatically translated with Google Translate.

Bm75

sent on December 21, 2017

Pros: mechanical construction, minimum weight and size, clarity, flare resistance, low distortion on the right

Cons: nobody

Opinion: Used only on the right is my favorite optics on K5. superb optical rendering with full colors and well-managed contrasts. It is very very clear. Despite the age does not suffer on apsc of any particular aberration. Just closing the diaphragm is clear from one meter to infinity on apsc thanks to the hyperfocal due to the focal length. this is a nice advantage of apsc because we have the hyperfocal of a 20 mm Ff with the focal equivalent of a 30. Being a lens that is the excellent condition at about 100 euros I would say that is a great purchase and thanks to the ring of the diafrmmi present also allows a mirrorless use also FF.

Stefano Banda

sent on February 10, 2017

Pros: Small and lightweight, rugged construction, the complete absence of fraying

Cons: A bit 'dark, completely manual, color rendering a bit' cold

Opinion: Despite having 40 years is a perspective that still behaves well with the sensor, rather demanding, riding K-3. E 'completely manual and completely devoid of electrical contacts, so exposure should be calculated, because the camera does not know which diaphragm is set. Like all the objectives of the past, is of robust construction and diaphragms are marked with a "click" that leaves no doubt. It is not very bright, which may be a limit in some case, however, the 20 mm focal length ensures a good margin with the safety times. At the maximum aperture the sharpness falls a bit 'on the edge, but just close to f / 5.6, and the problem is resolved great. Only the colors are not that great. Unlike big brother 28mm f / 2.8, this has made it a bit 'chilly and certain shots need to "warm them" a bit' in PP. It is online or at flea markets for a few tens of euros, and it may be worth it.

Marco S Sandri

sent on August 11, 2015

Pros: Sharpness, resistance to flare, size, weight, construction

Cons: Opening f4, it is completely manual

Opinion: I bought this lens now a year ago after reading the great reviews and viewed some samples.rnNe I was impressed by the extreme sharpness, for the full and saturated colors and the amazing resistance to flare! RNE really small, mounted on reflex makes it compact and easy to handle, when I travel I just can not staccarlo.rnSebbene manual is its perfect construction makes it extremely easy to use!

Photos taken with Pentax M SMC 20mm f/4

The three oaks

by Marzio Iotti
61 comments, 3108 views

Reflective landscape

by Marzio Iotti
26 comments, 1089 views

Landscape 1

by Marzio Iotti
5 comments, 717 views

Cityscape 2

by Marzio Iotti
13 comments, 192 views

Bicycles

by Marzio Iotti
16 comments, 225 views

Italy

by Marzio Iotti
11 comments, 1130 views

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The gondolas of Charon

by Marco S Sandri
10 comments, 1776 views

Stupinigi - Notturno

by Bigisbetter
3 comments, 843 views

Rocks

by Marzio Iotti
5 comments, 110 views

Landscape 12

by Marzio Iotti
12 comments, 791 views

Landscape 5

by Marzio Iotti
5 comments, 859 views

A walk

by Marzio Iotti
0 comments, 102 views

My hens

by Marzio Iotti
13 comments, 831 views

View from Malga Flavona - Dolomites

by Marco S Sandri
0 comments, 1272 views

My friend

by Marzio Iotti
3 comments, 878 views

Untitled Photo

by Eugen Frunza
5 comments, 1050 views

HI RES 9.2 MP

Milan Cordusio

by Marco S Sandri
3 comments, 995 views

Palace of Merchandise (Bologna)

by Bigisbetter
0 comments, 961 views

Castle of the angels - group of steaming

by Marco S Sandri
1 comments, 1819 views

Tops or stormy sea?

by Marco S Sandri
2 comments, 1049 views

Campaign 2

by Marzio Iotti
4 comments, 80 views

No Title

by Marco S Sandri
1 comments, 1044 views

The lake

by Marzio Iotti
2 comments, 734 views

Milan street food

by Marco S Sandri
0 comments, 1151 views

Infrared on Val Leogra

by 26switar
0 comments, 1105 views

Mount Baldo

by Marzio Iotti
4 comments, 589 views

Plain

by Marzio Iotti
2 comments, 79 views

Untitled Photo

by Bm75
2 comments, 1117 views

Castle of the angels from Pra '

by Marco S Sandri
2 comments, 1093 views

On the river Enza

by Marzio Iotti
3 comments, 127 views

Lewisia

by Eugen Frunza
5 comments, 809 views

HI RES 10.5 MP

Primaneve

by Marco S Sandri
0 comments, 967 views

People in showcase

by Marco S Sandri
0 comments, 977 views

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Isoppo, the old

by 26switar
1 comments, 799 views

HI RES 6.0 MP

Fast Babila

by Marco S Sandri
0 comments, 1002 views

Expo - Poland Pavillion_1

by Marco S Sandri
0 comments, 1074 views

Tree

by Marzio Iotti
4 comments, 101 views

HI RES 10.7 MP

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Reviews » Lenses » Lenses Pentax » Pentax M SMC 20mm f/4

Pentax M SMC 20mm f/4 : Specifications and Opinions

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Reviews

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Photos taken with Pentax M SMC 20mm f/4