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Minolta Camera Co., Ltd

Minolt AF-C

Minolta AF-C

Minolta AF-C is absolutely one of the most advanced classic compact cameras. It is small and quiet and it has a very sharp semi-wide lens as well an automatic focusing. The only weak point could be the absence of motor drive.
The Flash unit has a special attachment on the left side of the camera. Therefore you can not see any particular hot shoe, actually there isn't any.

The Nichi-Doku Shashinki Shoten (Japan-Germany Camera Company) was established in 1928. It was the forerunner of Konica Minolta Camera Co. The corporate name was changed to Minolta Goshi Kaisha in 1931 and to Chiyoda Kogaku Seiko K.K. in 1937. Konica-Minolta announced discontinuing all film and digital camera production in 2006 thus ending a 78-year history as a camera manufacturer.
The assets were transferred to Sony Corporation so, that all production would continue under Sony's management.

Flash back



Left: On the back of the flash unit there is a scale for a maximum distance for a flash for various film speeds.

Right: Without a flash, Minolta AF-C is small and light.

Without flash

Specifications :

Lens : Minolta 35 mm f/2.8 (a slide lens cover)
Rangefinder : Auto focus which can be locked
Viewfinder : Bright frame
Exposure meter : Cds-cell (ISO 25-400)
Shutter: Programmed, electronic leaf shutter.
Film transfer : Manual, with a wheel
Film rewind : Manual, with a lever
Battery : 2 x 3 v lithium CR 1/3N or 4 x 1,5 v LR44
Size/Weight : 43x68x105 mm / 220 g (without flash)

Something about Auto Focusing

In a brief there are two basic methods used in Auto Focus systems

1. Active Focus: This system is is the least expensive to implement. Basically, it uses a high frequence voice (sonar) or today typically an infrared beam to measure the distance to the subject and then focuses according to the correct settings for that distance. The movement of the lenses is done by an electric motor.

2. Passive Focus System: This type of system employs mechanisms that detect contrast in the field of view. Passive focus works by the camera adjusting the lens until it detects that the highest level of contrast has been achieved. Some difficulties may appear if teh subject is not contrasty enough and there is less noticeable change from one part of a picture to the other.


Cameras with automatic focusing systems usually measure the distance to the center of a view. This method, however, is inaccurate when the object of interest is not at the center. Measuring more than one distance is an approach that may solve this problem. Then the system have to include some kind of program to determine which of the measurements are the most accurate for desired end result.

Image Based Auto-Focusing is trying to find a solution using Artificial Intelligence to determine a problem for a photographer.

In Digital Cameras Autofocusing is slightly easier to carry out because the indicators are already there in the CCD.

It is also very important to understand that, because, physically, there can only be one sharpest distance from the lens to certain points of an object the amount of the "correct" alternatives is numerous or maybe more.

©2008 Reijo Lauro