Sirius lenses User manual

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                                               Depth of Field
                                              When the camera is focused on an object, an area in
                                                              front of and behind the object will be in acceptable
Multi-Coating                                        sharp focus. The distance between the nearest and
                                                                   farthest objects in focus is depth of  f ield.The multi-layer method of lens coating utilized in the
manufacture of Sirius lenses is the most efficient way                                                                                                                            aof controlling the transmission of light through the       The apparent depth of sharpness when focusing on lens. Light flares and reflections are minjmized by         subject is determined by the focal length of the lens                                                                                                  appears tothese multiple lens coatings.                         and F/stop selected. A wide angle lens                                                           have greater depth of sharpness, while a telephoto lens
                                                          appears to have'a very narrow and selective depth of
                                                        sharp focus. By stopping a lens down (closing), this
Aperture Control                                       apparent depth of sharpness can be increased. Depth
The automatic diaphragm operation of your Sirius,lens        of field adjustments can produce very creative results
allows you to focus and compose your picture with              if properly used.
the diaphragm at maximum aperture (wide open).
presenting you urith the brightest possible vielnjfinder
image. When shooting, the diaphragm will automatical-
ly stop down to the pre-selected aperture at the
moment of exposure and re-open as the exposure  is
completecj.
This function is performed internally with bayonet
mount lenses. There is an Auto/Manual switch on
lenses with a Pentax universal screw mount. whichmust be set on "A" for automatic diaphragm control.
When set in the "M" position, the diaphragm opens
and closes as the aperture ring is rotated.

As on your standard camera lens, your new accessory         Storage
lens has a depth of field scale which enables you to
calculate limits of focus in front of and behind your        Never store lenses in extreme heat and high humidity
main subject. These markings correlate with the         areas. Avoid areas where there is heavy exposure to
distance scales on the focus ring. For depth of field           salt water or salt air.
pre-view. see your camera instruction book.                                                                 Protect your lens by using front and rear lens caps.

                                                    Care and Cleaning
                                                  Use a blower or camel's hair brush to clean the lens
                                                               surface or rub VERY GENTLY in a circular motion
Your Sirius lens provides an infra-red index mark (see       with a high-quality lens tissue. In severe cases you
Description of Parts) for use with infra-red film. When        can use a small amount of lens cleaning solution, agoin
using infra-red film, focus normally on your subject        wiping in a circular motion. NEVER RUB THE LENS
and read the distance on the distance scale indicated     TO REMOVE DIRT OR GRIT!. lf the dirt will not
by the distance index mark. Then, turn the focusing      come loose with a brush or blower, take the lens to a
ring until this distance reading is lined up with the        factory approved service technician. Neraer touch the
 infra-red index mark.                                         lens with your fingers or any material other than a                  :,'{
                                                           brush                                                                     or lens tissue. Do not use chemically treated eye-                 'iI                                                                    glass tissues.

Zf,mm F:2.8 Macro
Wide Angle Lens

    Construction           6 groups, 6 elements
   Angle of View          754
    Aperture Range        f:2.8-?2
   Minimum Focus          0.6 ft. (at Macro)
     Filter Size             52 mm
    Length                 1.6 in.
   Weight                  8.1 oz