Infrared picture-taking, Double exposures

Infrared picture-taking

In infrared photography, the plane of sharpest image is slightly more distant than the one produced by visible light and seen by the naked eye through the viewfinder. To compensate for the shTh in focus, Nikkor lenses have a red dot or line engraved on the lens barrel near the color-coded depth-of-field index scale on top of the lens. After focusing the image sharply through the viewfinder, turn the focusing ring to the left until the red dot lines up with the prefocused distance.

For example, in the picture below the 50mm f/1.4 lens has been focused at infinity (oo). The focusing ring is turned slightly to the left so that the infinity marking appears in line with the red dot When a lens having a focal length of 50mm or less (normal or wideangle) is used at an aperture of f/8 or smaller, no adjustment is necessary. The lens has sufficient depth offield at such

small i apertures to compensate for the shift in focus.

Intentional double exposures can be made with the Nikon F as follows: After making the first exposure, set the A-R ring around the shutter release button to "R" and turn the rewind crank in the direction of the arrow until the red dot on the shutter release button rotates a full 360 degrees (or slightly more). Reset the A-R ring to "A" and wind the shyster for the second exposure. The film winding is confirmed by checking the red dot on the shutter release button which rotates a full 360 degrees. Any shutter speed may be used for the second exposure.

The exposure counter will not compensate for the rewinding, so the film in the camera will actually have one frame or two more than indicated.

Double exposures

The use of a lens hood is recommended at all times to prevent extraneous light from striking the lens surface and causing flare or ghost, and as an added measure of protection against damage to the lens. Nikon lens hoods come in four types depending on the lens: Screw-In, Snap-On, Slip-On and Builtln. They are calculated precisely for each focal-length Nikkor lens to provide maximum protection against stray light.

To attach or remove the snap-on lens hood, simply depress the buttons on either side of the hood. It will also fit directly over a screw-in filter, so both can be used on a lens at the same time. When not in use, the snapon hood can be reversed for storage on the lens, and the lens and its hood can be stored together in the eveready case.