NOTE: In order to compensate focusing when normal positioning may be altered due to extreme temperature change, the focusing ring has been designed to allow rotation beyond the xed marks of the distance scale. To avoid mistakes, always focus while looking through the viewnder.
NOTE: No adjustments in focusing are necessary when taking infrared photography as required with normal lenses.
4. Light and Contrast Control
Since the reex lens is not equipped with a diaphragm system, the use of lters plays an important factor in the control of light and contrast.
5. Filters
Normal (IA Skylight): This lter should be used when no other lters are necessary.
ND 2X & ND 4X (Neutral Density): These lters control the passage of light since no diaphragm is provided in the lens. Exposure factor is 4X with a ND4X, so that the light intake through the lens is decreased as if a similar lens were