malykh.com notes

2024-06-21

Pentax M 50/4 Macro + 26mm extension tube

My main purpose for the 26mm extension tube is to use it with the Pentax M 50/4 Macro.

This is a combination of the Pentax M 50/4 Macro lens + the 26mm Pentax K extension tube + the Pentax K-Sony FE adapter.

Without an extension tube, the Pentax M 50/2 Macro has a maximum magnification of 0.5x (1:2). With the 26mm extension tube, the magnification ranges from 0.5x (1:2) to 1x (1:1) depending on the rotation of the focus ring. This is sufficient for my tasks.

At f/8, the depth of field is quite shallow:

(Lilac/Syringa)

See also related notes:

JJC FDA-S1: Digitizing 135 film (2024-07-22)

Image albums:

2024-06-20

Pentax 17: Brand new half-frame film camera

Ricoh has announced the Pentax 17, a half-frame film camera. So unexpected for 2024!

(source)

The camera uses standard 135 (35mm) film, but the frame size is 17x24mm instead of 36x24mm:

(source)

And the frame has a vertical (portrait) orientation by default.

(source)

The Pentax camera is called 17 because the frame size is 17mm. The frame diagonal is about 29mm, so the crop factor is about 1.5x.

The lens is a fixed prime 25mm f/3.5 (37mm f/5 equivalent). The lens has 3 elements in 3 groups (a triplet). The aperture (f/3.5-f/16) has 9 blades. The filter thread size is 40.5mm (classic for small lenses).

The lens has only manual focus with coarse (6 zones) scale: 0.24-0.26m, 0.47-0.54m, 1-1.4m, 1.4-2.2m, 2.1-5.3m, 5.1m-∞.

(source)

The viewfinder is vertical, as expected.

(source)

The film is manually advanced and rewound, and I like that.

(source)

The electronics control the shutter, automatic exposure, a flash, and the movement of the optical elements (according to the manual focus). However, the ISO value is set manually (50-3200), allowing the use of film cassettes without a DX code. This is important today.

A CR2 non-rechargeable battery is used.

(source)

I would prefer something cheaper, but the flash uses a lot of power.

The fastest shutter speed is 1/350. At f/3.5 it is too slow for outdoor use. Manual scale focusing implies a closed aperture.

As far as I know, there is no aperture priority mode where you can choose an aperture. However, you can use the "Bokeh" mode, which tries to use the widest suitable aperture. Anyway, no aperture is displayed anywhere.

Image albums:

Pentax 17

2024-06-19

Industar-26M 50/2.8: Samples [1] - FF - f/2.8

Photos taken with the Sony a7c (FF, 24MP) and the Industar-26M 50/2.8 at f/2.8.

The front optical element of the lens is chipped. So there is a lot of flare in some conditions.

See also related notes:

Lenses from USSR (2024) (2024-06-08)

Image albums:

Industar-26M 50/2.8

2024-06-18

Vivitar V3800N: Film memo holder

This is a box of photographic film.

You can cut off part of the box:

And insert it into a square window on the back of the Vivitar V3800N (to remember ISO and the number of frames):

This window is a film memo holder for a part of a box or for some other memo information.

Warning: A memo can only be inserted or removed when the back is open. When the back is closed, the eyepiece blocks access to the memo.

See also related notes:

Vivitar V3800N: Film SLR camera with Pentax K mount (2024-04-20)

Image albums:

2024-06-17

Lenses I owned (2004-2024)

There were some lenses that I owned. I sold them, gave them away, or threw them away. I tried to remember and list them all (40+ items):

Primes

Samsung NX 10/3.5 Fisheye (NX-AF)

Pentax DA 14/2.8 (K-AF)

Samsung NX 16/2.4 (NX-AF)

Зенитар/Zenitar-K 16/2.8 Fisheye (K)

Brightin Star 23/5.6 (FE)

Revue 24/4 (M42)

Holga 29/8 (NX)

Pentacon 30/3.5 (M42)

AstrHori/RockStar 35/1.8 (FE)

Flektogon 35/2.4 (M42)

Мир/Mir-1В/1V 37/2.8 (M42) - two (or more?) copies

Samsung NX 45/1.8 2D (NX-AF)

Юпитер/Jupiter-3 50/1.5 (M39-RF)

Зенитар/Zenitar-M 50/1.7 (M42)

Pentax A 50/1.7 (K)

Зенитар/Zenitar-К2 50/2 (K)

Индустар/Industar-61-ЛЗ/LZ 50/2.8 (M42)

Гелиос/Helios-44M 58/2 (M42)

Гелиос/Helios-44M-4 58/2 (M42)

Гелиос/Helios-44M-6 58/2 (M42)

Samsung NX 60/2 Macro (NX-AF)

Гелиос-40 85/1.5 (M39-SLR)

Vivitar 85/1.8 (F)

Юпитер/Jupiter-9 85/2 (M42) - two copies

Вега/Vega-22УЦ/UTs 103/5.6 (M42-Enlarger)

Вега/Vega-5У/U 4/105 (M42-Enlarger)

Таир/Tair-11A 135/3.5 (M42)

Юпитер/Jupiter-37AM 135/3.5 (M42)

Vivitar 135/3.5 (T)

Юпитер/Jupiter-11 135/4 (M39-SLR)

Таир/Tair-3С/3S 300/4.5 (M42)

Zooms

Samsung NX 16-50/3.5-5.6 PZ (NX-AF)

Pentax DA 18-55/3.5-5.6 (K-AF)

Samsung DA 18-55/3.5-5.6 III (NX-AF) - two copies

Samsung NX 20-50/3.5-5.6 II (NX-AF)

Вариозенитар/Variozenitar 25-45/2.8-3.5 (K)

Pentax F 35-80/4-5.6 (K-AF)

Pentax A 35-105/3.5 (K)

Samsung NX 50-200/4-5.6 III (NX-AF)

Gemini 80-200/4.5 (K)

The lenses I disliked the most were the Mir-1V and the Jupiter-9, although I tried several copies. They were bad both mechanically and optically. Maybe earlier ("silver") versions are better, but I don't want to check.

See also related notes: