Bronica RF645

Medium format MF film rangefinder camera

Production details

Production details
Announced:September 2000
Production type:Mass production
System: Bronica RF645 (2000)

Specification

Imaging plane
Maximum format:Medium format 6x4.5
Mount and Flange focal distance:Bronica RF645
Imaging plane:56 × 41.5mm film
Shutter
Type:In-lens leaf shutter
Exposure
Exposure metering:Through the separate window
Exposure modes:Programmed Auto
Aperture-priority Auto
Manual
Rangefinder and Viewfinder
Rangefinder:Built-in, combined with viewfinder
Viewfinder:Built-in, combined with rangefinder
Finder magnification:0.6x
Actual rangefinder base:53.5mm
Effective rangefinder base:32.1mm
Bright-line frames:65mm, 135mm
Parallax compensation:Yes
Physical characteristics
Weight:810g
Dimensions:145.6x107.3x64mm

Manufacturer description

Camera Type: Coupled-meter rangefinder, lens shutter 6 X 4.5 format camera

Picture Format: 41.5 mm X 56 mm

Film: 16 frames on 120 type film, 32 frames on 220 type film

Shutter: Bronica No. 00 type electronically controlled lens shutter in each lens, shutter speeds: B, 1 to 1/500 sec. (on manual without intermediate speeds), 8 to 1/500 sec. (on aperture-priority AE mode, 1/12-stop increment control), 8 to 1/750 sec. (on programmed AE mode, 1/12-stop increment control). Electronically timed self timer with 10 sec. delay time

Advance: By rapid winding lever placed on top of camera with either 186 deg. single stroke or ratcheted strokes, with 12 deg. standby angle

Rangefinder: Dual-image superimposing real image optical system, with 53.5 mm base line (effective base line: 33 mm)

Viewfinder: Inverse Galilean optical system with coupled rangefinder bright frames automatically switched between 65 mm and 135 mm lens and automatically corrects parallax, finder magnification 0.6X, viewing field 81% at 3 m

In-Finder Display: Shutter speeds, lens aperture, correct exposures, flash ready, exposure compensation warning, AE L warning, multiple exposure (ME) warning

Exposure Metering: Center-weighted area-comparative metering system, metering range EV 3 to EV 18 (65 mm f/4, ISO 100), film speed range: ISO 25 to 1600, exposure compensation range: +2 to -2 EV (1/2-stop increment)

Exposure Control Modes: Manual, Aperture-priority AE and Programmed AE modes

Battery: 2 cells of CR2, 3V Lithium type battery

***

The RF645 features a high accuracy, easy to view dual image superimposing rangefinder. The rangefinder employs a superb quality real image optical system using mechanical and optical components of the highest precision design and manufacture. Focusing is clear and precise. The readily visible bright frame technology utilizes automatic parallax compensation that adjusts the frame to the point of focus for optimum framing.

In addition to Aperture-priority AE and full manual mode, the on-board metering system provides Program AE mode that makes it possible to capture those once in a lifetime images. All of the camera controls are available at your fingertips creating the perfect balance between automatic and manual control.

The entire system is engineered with key devices such as a newly developed super silent electronic lens shutter and an automatic light shielding curtain, which is activated whenever a lens is removed from the camera.

The shutter unit operations including shutter blade action, diaphragm movement and shutter recharge are all electronically controlled by an actuator inside the unit. This represents Bronica's first fully electronic shutter system.

A major difficulty increating an interchangeable lens with built-in shutter is that the camera body construction must prevent the film from being exposed when switching lenses. The lens removal and attachment mechanism activates a light shielding curtain to automatically cover the fil m surface.

It's no secret that a simple design is often the most effective. Combining rugged construction with intuitive control placement creates an instant bond between the RF645 and you.

At Bronica, we have never considered the camera to be a mere tool of the trade for photographers. True professionals form a special bond with their cameras, a kind of partnership, working together to capture precious scenes that may never come again. The feel, the handling, the action: all these combine to make the camera much more than just a meansof shooting photographs.

When we set out to design the RF645, our goal was to create a camera that photographers would love to handle, that would lead them into new creative territory. We aimed to design a new kind of rangefinder camera. In the RF645, we think we have succeeded.

Serious about combining structural strength with superior design and handling, we turned to advanced metal alloys for much of the body casing. The main body and front facing are die cast, the bottom plate is of brass, and the upper housing enclosing the viewfinder and integrated rangefinder mechanism is made of magnesium alloy.

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Copyright © 2012-2022 Evgenii Artemov. All rights reserved. Translation and/or reproduction of website materials in any form, including the Internet, is prohibited without the express written permission of the website owner.

35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm
  • Area: 864mm2

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Image stabilizer

A technology used for reducing or even eliminating the effects of camera shake. Gyro sensors inside the lens detect camera shake and pass the data to a microcomputer. Then an image stabilization group of elements controlled by the microcomputer moves inside the lens and compensates camera shake in order to keep the image static on the imaging sensor or film.

The technology allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without image stabilizer you have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.

Original name

Lens name as indicated on the lens barrel (usually on the front ring). With lenses from film era, may vary slightly from batch to batch.

Format

Format refers to the shape and size of film or image sensor.

35mm is the common name of the 36x24mm film format or image sensor format. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43mm. The name originates with the total width of the 135 film which was the primary medium of the format prior to the invention of the full frame digital SLR. Historically the 35mm format was sometimes called small format to distinguish it from the medium and large formats.

APS-C is an image sensor format approximately equivalent in size to the film negatives of 25.1x16.7mm with an aspect ratio of 3:2.

Medium format is a film format or image sensor format larger than 36x24mm (35mm) but smaller than 4x5in (large format).

Angle of view

Angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.

As the focal length changes, the angle of view also changes. The shorter the focal length (eg 18mm), the wider the angle of view. Conversely, the longer the focal length (eg 55mm), the smaller the angle of view.

A camera's angle of view depends not only on the lens, but also on the sensor. Imaging sensors are sometimes smaller than 35mm film frame, and this causes the lens to have a narrower angle of view than with 35mm film, by a certain factor for each sensor (called the crop factor).

This website does not use the angles of view provided by lens manufacturers, but calculates them automatically by the following formula: 114.6 * arctan (21.622 / CF * FL),

where:

CF – crop-factor of a sensor,
FL – focal length of a lens.

Mount

A lens mount is an interface — mechanical and often also electrical — between a camera body and a lens.

A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock type. Modern camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body, unlike screw-threaded mounts.

Lens mounts of competing manufacturers (Canon, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance can also be different.

The flange focal distance (FFD) is the distance from the mechanical rear end surface of the lens mount to the focal plane.

Lens construction

Lens construction – a specific arrangement of elements and groups that make up the optical design, including type and size of elements, type of used materials etc.

Element - an individual piece of glass which makes up one component of a photographic lens. Photographic lenses are nearly always built up of multiple such elements.

Group – a cemented together pieces of glass which form a single unit or an individual piece of glass. The advantage is that there is no glass-air surfaces between cemented together pieces of glass, which reduces reflections.

Focal length

The focal length is the factor that determines the size of the image reproduced on the focal plane, picture angle which covers the area of the subject to be photographed, depth of field, etc.

Speed

The largest opening or stop at which a lens can be used is referred to as the speed of the lens. The larger the maximum aperture is, the faster the lens is considered to be. Lenses that offer a large maximum aperture are commonly referred to as fast lenses, and lenses with smaller maximum aperture are regarded as slow.

In low-light situations, having a wider maximum aperture means that you can shoot at a faster shutter speed or work at a lower ISO, or both.

Closest focusing distance

The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.

Closest working distance

The distance from the front edge of the lens to the subject at the maximum magnification.

Magnification ratio

Determines how large the subject will appear in the final image. For example, a magnification ratio of 1:1 means that the image of the subject formed on the film or sensor will be the same size as the subject in real life. For this reason, a 1:1 ratio is often called "life-size".

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Electronic manual focus override is performed in the following way: half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the focusing ring.

Manual diaphragm

The diaphragm must be stopped down manually by rotating the detent aperture ring.

Preset diaphragm

The lens has two rings, one is for pre-setting, while the other is for normal diaphragm adjustment. The first ring must be set at the desired aperture, the second ring then should be fully opened for focusing, and turned back for stop down to the pre-set value.

Semi-automatic diaphragm

The lens features spring mechanism in the diaphragm, triggered by the shutter release, which stops down the diaphragm to the pre-set value. The spring needs to be reset manually after each exposure to re-open diaphragm to its maximum value.

Automatic diaphragm

The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.

Fixed diaphragm

The aperture setting is fixed at F/ on this lens, and cannot be adjusted.

Number of blades

As a general rule, the more blades that are used to create the aperture opening in the lens, the rounder the out-of-focus highlights will be.

Some lenses are designed with curved diaphragm blades, so the roundness of the aperture comes not from the number of blades, but from their shape. However, the fewer blades the diaphragm has, the more difficult it is to form a circle, regardless of rounded edges.

At maximum aperture, the opening will be circular regardless of the number of blades.

Weight

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

Maximum diameter x Length

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

For lenses with collapsible design, the length is indicated for the working (retracted) state.

Weather sealing

A rubber material which is inserted in between each externally exposed part (manual focus and zoom rings, buttons, switch panels etc.) to ensure it is properly sealed against dust and moisture.

Lenses that accept front mounted filters typically do not have gaskets behind the filter mount. It is recommended to use a filter for complete weather resistance when desired.

Fluorine coating

Helps keep lenses clean by reducing the possibility of dust and dirt adhering to the lens and by facilitating cleaning should the need arise. Applied to the outer surface of the front and/or rear lens elements over multi-coatings.

Filters

Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.

Lens hood

A lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background.

The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood.

Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens.

Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.

Teleconverters

Teleconverters increase the effective focal length of lenses. They also usually maintain the closest focusing distance of lenses, thus increasing the magnification significantly. A lens combined with a teleconverter is normally smaller, lighter and cheaper than a "direct" telephoto lens of the same focal length and speed.

Teleconverters are a convenient way of enhancing telephoto capability, but it comes at a cost − reduced maximum aperture. Also, since teleconverters magnify every detail in the image, they logically also magnify residual aberrations of the lens.

Lens caps

Scratched lens surfaces can spoil the definition and contrast of even the finest lenses. Lens covers are the best and most inexpensive protection available against dust, moisture and abrasion. Safeguard lens elements - both front and rear - whenever the lens is not in use.