Interchangeable Focusing Screens
Since the ideal screen varies with the lens in use and the photographic field, Canon offers 13 different types of interchangeable focusing screens for the New.S;anon F-1. All 13 types are available for both center-weighted average and selective-area metering. Six types, screens B, C, E, I, J and K, are available for spot metering for such specialized fields as photomacrography and telephotography.
Metering Sensitivity Areas
Each screen is named according to metering area and type. The three metering areas are designated as follows: A - Center-weighted Average Metering P - Selective-area (Partial) Metering S - Spot Metering The last two letters in the screen's name denote metering area and type of screen respectively. Thus, Focusing Screen FN-PE offers selective-area metering and is the type E, or New Split/Microprism, screen. The thirteen types of screens, each designated by letter, are shown on the next three pages.
A. Standard Microprism
Laser-matte/fresnel field with microprism rangefinder spot in the center of the screen. Well suited for general photography when using an qperture of f/5.6 or larger.
B. New Split
Laser-matte/fresnel field with split-image rangefinder spot in the center of the screen. Since darkening of the center spot rarely occurs even with small maximum aperture lenses, this screen is suited for general applications.
C. Overall Laser Matte
Overall laser-matte/fresnel field. An ideal screen for photomacrography, telephoto photography and other applications in which an unobstructed view is required. Suitable for us~e with all lenses.
D. Laser Matte with Grid
Similar to C screen, but with horizontal and vertical reference lines to facilitate accurate image placement. Especially effective for architectural and commercial photography as well as copy work. Suitable for use with all lenses; particularly recommended for TS (Tilt and Shift} 35mm f/2.8 lens.
E. New Split/Microprism
Laser-matte/fresnel field with split-image spot in the center and~surrounding microprism collar. Provides optimum flexibility and focusing accuracy with any of the three focusing aids. Suitable for general applications. Standard screen with the New Canon F-1.
F. Microprism/Fast Lenses
Similar to A screen, but permits fast and precise ï focusing with lenses having maximum apertures of f/1.2 - 2.8. Unsuitable for slower lenses due to darkening of the microprism rangefinder.
G. Microprism/Slow Lenses
Similar to A screen, but designed for use with lenses having maximum apertures~bf f/3.5ñ5.6. Recommended for use with telephoto lenses, it allows rapid, easy focusing without darkening of the rangefinder. Unsuitable for use with faster lenses because of focusing inaccuracy.
H. Laser Matte with Scale
Laser-matte/fresnel field with fine matte center spot plus horizontal and vertical lines in 1 mm graduations. Effective for close-up photography, photomacrography and photomicrography where the size of the image or the magnification is of particular concern. Suitable for use with all lenses.
I. Laser Matte with Double Cross-hair Reticle
Laser-matte/fresnel field with 5mm center spot containing double cross-hair reticle. Especially suited for applications requiring high magnification, such as photomicrography and astrophotography.
J. Bright Laser Matte/Short Lenses
Overall fine laser-matte/fresnel field. The brightest of the laser-matte screens, it allows rapid and easy focusing without darkening, even when using small apgrture lenses. Especially recom,mended for focusing a dark subject or in dim light. Also useful when the lens must be stopped down, as in close-up applications. Suitable for use with lenses from 1 5mm to 200mm; particularly effective with 50mm to 200mm, including macro lenses. Unsuitable for lenses of 300mm and longer because of darkening at edges of screen.
K. Bright Laser Matte/Long Lenses
Overall fine laser-matte/fresnel field. Similar to J screen, but designed for use with lenses of 1 35mm and longer; especially~seful with lenses of 300mm and longer. Unsuitable fior use with standard or wideangle lenses due to darkening at edges of screen.
L. Cross Split
Laser-matte/fresnel field with cross split-image in the center of the screen which divides the subject in half horizontally and vertically. Suitable for general photography when using an aperture larger than f/5.6.
M. A/B Size Laser Matte
Overall laser-matte/fresnel field with 2x2mm crosses in the four corners of the screen. Designed especially for use in the publishing field, it facilitates cropping when copying printed matter of A or B size.
Changing the Focusing Screen
If there is film loaded, shield the camera from direct sunlight while changing the screen.
1. First pull the film a~vance lever out to its 30° stand-off position. To remove the finder, press the two release buttons and pull it straight back. 2. Insert a fingernail into one of the notches and lift up the screen. 3. To remove the screen, pick it up by its frame. Never touch the Fresnel side (the underside when in the camera). If fingerprints should adhere to the screen, it may be impossible to remove them. To avoid marring its surface, lay the screen upside down with the Fresnel side up. 4. Insert the unnotched side (side with screen name) of a new screen under the metal tab, and push down the other side until the screen drops into a fully-seated position. 5. Aligning the finder with the guide rails, push it in so that it locks with a click.
Note Focusing screens for the former Canon E- 1 and the New Canon F-1 are not interchangeable
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