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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. The average price, when it has been added to the JuzaPhoto database, is 300 €;

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, 2998 views

Reflective landscape

by Marzio Iotti
26 comments, 1024 views

Landscape 1

by Marzio Iotti
5 comments, 678 views

Bicycles

by Marzio Iotti
16 comments, 181 views

Cityscape 2

by Marzio Iotti
13 comments, 163 views

Italy

by Marzio Iotti
11 comments, 1092 views

The gondolas of Charon

by Marco S Sandri
10 comments, 1738 views

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Stupinigi - Notturno

by Bigisbetter
3 comments, 821 views

Rocks

by Marzio Iotti
5 comments, 73 views

Landscape 12

by Marzio Iotti
12 comments, 765 views

Landscape 5

by Marzio Iotti
5 comments, 824 views

A walk

by Marzio Iotti
0 comments, 66 views

My hens

by Marzio Iotti
13 comments, 810 views

View from Malga Flavona - Dolomites

by Marco S Sandri
0 comments, 1199 views

My friend

by Marzio Iotti
3 comments, 841 views

Untitled Photo

by Eugen Frunza
5 comments, 1016 views

HI RES 9.2 MP

Milan Cordusio

by Marco S Sandri
3 comments, 952 views

Palace of Merchandise (Bologna)

by Bigisbetter
0 comments, 926 views

Castle of the angels - group of steaming

by Marco S Sandri
1 comments, 1778 views

Tops or stormy sea?

by Marco S Sandri
2 comments, 1014 views

No Title

by Marco S Sandri
1 comments, 1016 views

The lake

by Marzio Iotti
2 comments, 707 views

Milan street food

by Marco S Sandri
0 comments, 1109 views

Infrared on Val Leogra

by 26switar
0 comments, 1073 views

Mount Baldo

by Marzio Iotti
4 comments, 556 views

Untitled Photo

by Bm75
2 comments, 1079 views

Castle of the angels from Pra '

by Marco S Sandri
2 comments, 1062 views

Plain

by Marzio Iotti
2 comments, 43 views

On the river Enza

by Marzio Iotti
3 comments, 89 views

Lewisia

by Eugen Frunza
5 comments, 784 views

HI RES 10.5 MP

Primaneve

by Marco S Sandri
0 comments, 943 views

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People in showcase

by Marco S Sandri
0 comments, 943 views

Isoppo, the old

by 26switar
1 comments, 766 views

HI RES 6.0 MP

Fast Babila

by Marco S Sandri
0 comments, 972 views

Expo - Poland Pavillion_1

by Marco S Sandri
0 comments, 1032 views

Tree

by Marzio Iotti
4 comments, 62 views

HI RES 10.7 MP

Districts and valleys of Veneto

by Marco S Sandri
0 comments, 738 views

The sample photos are selected automatically between all photos posted by JuzaPhoto members, using the camera and the lens selected in the techs. If you find evident errors (e.g. photos taken with cameras and lenses that are not available yet), you can contribute to improve the page by sending a private message to the user that has entered incorrect values in the photo caption.

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