Classic SLRs Series :
Setting the ASA Film Speed Dial Setting the correct ASA film speed on the camera is one of the most important factors in obtaining properly exposed pictures. Because if the film speed is not match with the film you have loaded, all images exposed in your camera will either be over or under exposure even if the OM-2 has a very highly accurate metering system. To set the dial:
 Lift up the outer collar of the exposure compensation dial and rotate until the ASA speed for the film you are using appears in the dial window.  Release the collar to lock the film speed setting.  Once the setting has been made, turn the dial until the white line is aligned with the black index line on the pentaprism housing.* Make certain you align the white line with the black index line on the pentaprism after setting ASA.
* The ASA film speed scale on the dial is marked from 12 to 1600 in increments of 1/3 stops. In some circumstances, you may not be able to rotate the outer collar to the desired ASA in one turn of the dial (only 3 stops can be rotated in one turn of the dial).
If you encounter some resistance when rotating the dial, release the collar and turn the exposure compensation dial several click stops in the opposite direction from the ASA you are trying to set. Then, lift the outer collar again and continue turning to the desired ASA setting. Repeat this procedure as many times as necessary until the desired ASA can be seen in the dial window. Finally, repeat Step , above. NEVER FORCE THE DIAL WHEN SETTING ASA/FILM SPEED.
Setting the Aperture Ring on the lens
The opening in the lens diaphragm is controlled by the aperture ring which is marked in F stops to indicate the opening size in relation to the focal length of the lens. For example, the standard 50mm F1.8 lens has an aperture ring with the F stops of 1.8, 2,8, 4, 5.6, 8, 11, and 16.
The higher the F number, the smaller the lens opening (less light) and the lower the F number, the larger the lens opening (more light). Also, higher F stops provide greater depth of field than lower F stops do. * When setting the aperture ring, you may use either the click-stop positions or any in-between settings to obtain precise exposure control. * All lenses in the OM System (except certain specialized lenses) provide fully automatic diaphragm control allowing you to focus and compose your picture with the lens fully open. The diaphragm will automatically change to the preselected F stop at the moment of exposure and immediately reopen when the exposure is completed. * For automatic exposure, the F stop is reset on the lens aperture ring and the camera selects the shutter speed for the lighting conditions in the scene.
Setting Manual Shutter Speed Ring Shutter speeds engraved on the manual shutter speed ring are used only for non-automatic camera operation with zero-method exposure measurement.
These 12 shutter speeds are indicated as B, 1, 2, 4, 8 ... up to 1,000. Yes, sign of old age does surface with the maximum shutter speed, primarily because almost all OM SLRs before the mid eighties are employing with a horizontal traveled shutter design and that could be the bottle neck for speed barrier. But generally, the speed limit at the lower end has more functional application than upper ones, except when you are using high speed film in daylight.
The 'B' indicates "bulb" at which setting the shutter will remain open as long as the shutter release button is held down. The other engravings indicate fractions of a second; for example "1" for 1 second, "2" for 1/2 second...up to "1000" for 1/1000 second. As the numbers increase, each setting halves exposure time. As the numbers decrease, each setting doubles exposure time. Shutter speeds from 1 to 60 are indicated in blue as an easy reference for X flash synchronization.
* Manual Operation *
To manually set the shutter speed, turn the selector lever to "MANUAL" and turn the shutter speed ring until the desired shutter speed clicks into place. * To set the shutter speed ring to position "B", turn the ring while pressing the "RESET" button at the body mount. * Make sure that the selector lever is set at "MANUAL" when taking time exposures on "B': * The manual exposure (including B) consumes the battery power.
Caution: for the use of manual shutter speed ring under automatic exposure control: electronic shutter automatically selects the optimum shutter speed from about 60 seconds (external review proves it can go beyond that limit comfortably) (ASA 100, at normal temperature and humidity) to 1/1000 second except B, where the shutter works manually. Be careful that at B the shutter remains open for a long time exposure in a dark place even after freeing the shutter release button.
Selector Lever The selector lever on top of your camera has four positions: 1) 'MANUAL" Zero-method exposure operation; set shutter speed and F stop for proper exposure. 2) 'OFF' ñ Camera turned completely off to avoid battery drain. Always store your camera with the selector lever in this position.
3) 'AUTO' ñ Automatic exposure control; you preset lens F stop and the camera automatically sets shutter speed for proper exposure. 4) 'CHECK' ñ Battery test position. A unique feature of your OM-2, the three-position viewfinder control center, allows you to determine the operating mode of your camera without checking the position of the selector lever.
1) 'AUTO' When the selector lever is in the "AUTO" position, the viewfinder displays the complete OM shutter speed scale for "AUTO" operation, over- and underexposure index marks, and the meter needle.2) 'OFF' When the selector lever is in the "OFF" position, there is no display in the viewfinder 3) 'MANUAL: When the selector lever is in the "MANUAL" position, only over- and under exposure index marks and the meter needle are visible in the viewfinder * : When you are not using your camera, make sure the selector lever is set at the off position to avoid unnecessary battery drain.
Light Measuring System For both automatic and manual exposure measurement, the OM-2 utilizes open aperture metering systems which allow you to take advantage of the brightest possible viewfinder when focusing and composing your pictures . For automatic exposure control, light entering the lens is measured directly at the film plane or at the shutter curtain by two SBC (silicone blue cells) at the precise moment the exposure is made.
When lighting conditions are bright enough to permit comparatively high shutter speeds, measurement is made at the computer-generated random digit pattern which is printed on the shutter curtain and has its own reflection different from that of the film, with emphasis at the center of the picture area. In darker lighting conditions, where slower shutter speeds are required, the exposure system automatically switches to an averaging method measured at the film plane.
The transition between the two methods of light measurement takes place automatically when lighting conditions call for shutter speeds between 1/15 second and 1/60 second.
When exposure is manually set, light is measured by two highly sensitive CdS cells positioned on each side of the viewfinder eyepiece.These cells measure the actual amount of light entering the lens, placing the greatest emphasis on the center of the picture area at full aperture. This "zero-method" system for manual exposure control works with all OM System Lenses except for a few special purpose lenses.
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