Features of Carl-Zeiss T* lens

• There are the indexes indicating the depth of field on the side-top of the lens.
  The indexes move by movements of the aperture ring.
  Read the number against at the indexes to know the depth of field.

• The light value system is adopted on T* lens series.
  As turning either the shutter speed ring or the aperture ring, other one turns, still keeping the combination of the shutter speed and the aperture value that were set previously.
  When changing the combination, with depressing the LV releaseing lever in the direction of the arrow, turn either the shutter speed ring or the aperture ring.