Nikon 1986 Infrared Compensation, Zooming and Depth of Field, Minimum Aperture Lock Fig

Infrared Compensation

When shooting black and white infrared film, it is necessary to make slight manual compensation to the focused distance. With color infrared film, no compensation in focus is needed. The small white dot just to the left of the distance index line is the infrared compensation index at the 80mm setting. First, focus manually on the subject, then realign your focused distance with the small white dot. Then attach a red (R60) filter for infrared photography. To determine the position of the infrared compensation index at all focal lengths, use this chart:

Focused length setting Compensation from distance index line (on distance scale)

80mm 1.3mm (white dot)

105mm0.6mm

135mm0.3mm

200mm0.2mm

Zooming and Depth of Field

To zoom in and out, turn the zoom ring until the desired composition is framed in the viewfinder. In M (manual focus) mode, focusing is possible at any focal length, but the longer the focal length, the larger the image and the shallower the depth of field, making focusing easier. If your camera has a depth of field preview (stop-down) button or lever, depth of field can be observed while looking through the camera viewfinder.

Minimum Aperture Lock (Fig. 4)

For programmed auto or shutter-priority auto exposure shooting, use the minimum aperture lock lever to lock the lens aperture at f/22.

1Set the lens to its minimum aperture (f/22) by aligning it with the aperture index.

2Slide the lock lever toward the aperture ring, so the white dot on the lever aligns with the orange dot.

To release the lock, slide the lever in the opposite direction.

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