Bencini Koroll 24 s

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Bencini Koroll 24 s

Технически данни:

Година на въвеждане: 1953

Вид на използвания филм: ролка - 3 x 4.5 см

Максимален брой заснети кадри: 24

Тип на използвания филм: формат 120

Скорости на затвора: 1/150, B

Тип на използвания обектив: f/11 (24S: f/9 or f/16)

Вградена светкавица: не

Повече информация

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The Koroll cameras were 120 film and 35mm viewfinder cameras made by Bencini in Milan, Italy starting in the 1950s. The body was based on a single aluminium alloy casting, which included the lens barrel. Each model seems to have gone through a number of facelifts, with minor cosmetic changes.

Frame sizes

120 film is designed to accommodate several different image sizes; but the one encountered most frequently would probably be 6×6 cm (more exactly 56×56 mm) square. This is sometimes referred to as "2¼ square" format by those who think in inches. Image sizes nominally 6×9 cm and 6×4.5 cm (a.k.a. "semi" format) are also standard. Additionally 6×7 cm, and less commonly, 6×8 cm and 6×10 cm are used by some cameras. Special-purpose panoramic cameras even produce 6×12, 6×17 cm, or even wider frames. Like "6×6", all sizes are nominal; actual dimensions are a bit smaller.

One advantage claimed for 6×7 and 6×4.5 sizes is that they enlarge almost exactly (without cropping) onto 8×10" paper, and thus proponents call these ideal format cameras. Among all the image sizes for 120 film, naturally the smallest "645" format permits the lightest and most compact cameras.

A roll of 120 film offers 16 exposures per roll in 6×4.5 format (for some cameras, only 15), twelve for 6×6, ten for 6×7, nine for 6×8 and eight for 6×9. Overall the film is 72 cm long. (For 220 film the frame counts will be twice this.)

Typical frame sizes (actual sizes may differ slightly)
nominal size		actual image area	frames
cm	in	mm	on 120	on 220
6 × 4.5		56 × 44	15 or 16	30 or 32
6 × 6	2¼ × 2¼	56 × 56	12	25
6 × 7		56 × 70	10	20
6 × 8		56 × 75	9	19
6 × 9	2¼ × 3¼	56 × 84	8	16
6 × 10		56 × 93	7

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Bencini Koroll 24 s

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