Kiron 105mm f/2.8
by Kino Precision
Angle of Acceptance: 23.3 degrees
Optical construction: 6 elements, 6 groups
Maximum reproduction ratio: 1:1
Minimum focusing distance
(from film pIane): 0.347 m (1.14 ft.)
Overall length: 102.5 mm (4.04 in.)
Maximum barrel diameter: 72 mm (2.8 in.)
Accessory size: 52mm
Weight: 650 g (22.75 oz.)
Mounting the Lens
Nikon, Pentax, Minolta, Olympus, Konica, Yashica/Contax mounts - Use the
standard procedure for mounting your camera brand lenses.
Canon mount - Canon mount Kiron lenses have a black mounting ring. Mount
the lens with all index marks aligned. Turn the
mounting ring clockwise to lock the lens onto your camera.
All mounts - Use the same
metering procedures you would use with your camera brand lenses.
Note to Nikon owners - The Kiron 1O5mm f2.8 is fully compatible with all
Nikon Al and A1-S mounts. Since there is no external meter coupling device
on this lens, however, it is not compatible with earlier Nikon F mounts.
The Kiron 1O5mm f2.8 focuses
continuously from infinity to 0.35 meters (13.8 inches), where the
reproduction ratio is 1:1 (life-size). To focus, look through the
viewfinder of your camera, and turn the focusing ring until the subject
appears sharp and clear.
The distance scale is marked in both meters (white) and feet (blue). These
figures indicate the distance from the subject to the film piane of the
The reproduction ratio is
the relationship between the size of the image on the film and the actual
size of the subject. For example, if the image on the film is one-half the
size of the actual subject, then it is said to have been reproduced at
1:2, or 1/2 life-size.
The reproduction ratios from 1:10 to 1:1 are indicated on the lens barrel
in gold. To photograph an object at a predetermined reproduction ratio of,
for example, 1:2, turn the focusing ring untii it lines up with the mark
opposite 1:2 on the lens barrel. Then move the lens closer to, or farther
from the subject, until it appears sharp and clear in the camera's
viewfinder. Or, if the reproduction ratiois not known in advance, focus
until you have the desired image in the viewfinder. Then look at the Iens
barrel to see what reproduction ratio will be achieved.
Since there are no click-stops involved, reproduction ratios between those
marked on the barrel, e.g. 1:6, 1:4, are easily achieved.
Greater than 1:1 reproduction ratios can be achieved with the addition of
a Kiron 2X MC7 teleconverter. This is a seven-element, multicoated
teleconverter that doubles the focal length of the lens, as well as
doubles the reproduction capabilities.
Depth of field refers to the
area of acceptable focus in front of, and behind the piane of sharpest
focus. There is a depth-of-field scale marked in white on the lens barrel.
However, since depth of field is so small at high reproduction ratios, a
lens opening of no larger than f/16 is recommended. If your camera has the
capability, it is desirable to preview the depth of field prior to taking
the photograph, so you can see the area which will be in focus.
For the sharpest photographs, precise depth-of-field information is
Again, because of the small
depth of field during dose up work, even slight movement can cause your
subject to be out of focus. A steady camera and lens are required for the
best resufts. The use of a tripod, as well as a cable release to activate
the camera's shutter, are recommended for all close up work.
Non-rotating Front Barrel.
The Kiron 1O5mm f2.8 lens is equipped with a non-rotating front barrel,
which means that the front barrel of the lens does not rotate as the lens
is focused. Position-sensitive filters, such as polarizers, and special
effects filters, or filter masks retain their orientation as the lens is
focused. Built-in Lens Hood. The Kiron 1O5mm f2.8 has a built-in,
retractable lens hood which, when extended, will help to control stray
light. All Kiron lenses feature full multicoating, with lens element edges
that are hand-blackened to prevent lens flare, and assure high contrast
and excellent color rendition.
Choose optical accessories,
such as filters, with the same regard to quality you used when buying this
lens. Low-quality accessories will compromise the high-quality results you
expect from your Kiron lens.
Take normal care to protect your lens from fingerprints, dirt, sand, and
water. Remove dust with a soft lens brush, or gentle puff of compressed
air. Remove fingerprints or other
marks with photographic lens tissue moistened with photographic lens
cleaner. Never rub the lens with dry tissue or any other material, since
this can scratch the coatings.
When your lens is being stored, keep it in a cool, dry place with front
and rear caps attached.
lf you live in a humid climate, it is important that your lens be
stored with a small package of silica gel (such as the one supplied) at
all times. This will help to prevent fungus, a result of high humidity,
from forming in the lens.