Tamron AF017M700, AF017C700 ZOOMING Ref. Figs.1, Setting lens f-numbers with Canon & Sony cameras

ZOOMING (Ref. Figs.1 & 2)

Rotate zooming ring (9) of the lens while viewing through the camera's viewfinder and compose your image at the chosen focal length.

LENS APERTURE AND AE MODE (Ref. Figs. 1, 7, & 8)

Setting lens f-numbers with Canon & Sony cameras

Set the f-number with aperture setting device of the camera body in accordance with the selected photographing mode.

For further details, please read the instruction manual of your camera.

Setting lens f-numbers with Nikon & Pentax cameras

Photographing in a programmed-AE or a shutter-speed-priority-AE mode. Rotate the lens aperture ring (21) to the minimum aperture position, in case of Nikon camera, and set on the “A” position in case of a Pentax camera. The aperture ring will be locked in position automatically. When shooting in an aperture-priority-AE or manual-exposure mode, release the lens aperture ring lock button.

The lens aperture varies with zooming movement. Cameras read the different lens openings and automatically adjust the exposure properly.

For further details, please read the instruction manual of your camera.

If your camera is a Nikon F401 or F50, you can set the aperture to any desired f-number, leaving the aperture ring at the minimum opening position.