Sigma 310 DATASHEET

ENGLISH

Thank you very much for purchasing a Sigma Lens. In order to get the
maximum performance and enjoyment out of your Sigma lens, please
read this instruction booklet thoroughly before you start to use the lens.

DESCRIPTION OF THE PARTS (fig.1)

① Filter Attachment Thread ⑤ Focus Index Line
② Focus Ring ⑥ Focus Mode Switch
③ Distance Scale ⑦ Mount
④ Depth of Field Read Out Index ⑧ Lens Hood

NIKON AF TYPE CAMERAS

This lens functions in the sa me way as a G Type auto-focus Nikon lens
(without an aperture ring). Functions may be restricted depending on the
lens/camera combination. For more details, please refer to the camera’s
instruction manual.

PENTAX AF TYPE CAMERAS

This Lens functions same as a FAJ Type (type without Aperture)
auto-focus Pentax lens. Depending on the combination with camera some
restrictions with its functions may result. For more details, please refer to
instruction manual of the camera in use etc.

ATTACHING TO CAMERA BODY

When this lens is attached to the camera body it will automatically function
in the same way as your normal lens. Please refer to the instruction
booklet for your camera body.

◆ On the lens mount surface, there are a number of couplers and

electrical contacts. Please keep them clean to ensure proper connection.
To avoid damaging the lens, be especially sure to place the lens with its
front end down while changing the lens.

◆ Many accessories such as rear mounted teleconverters, extension

tubes, etc., are specially made for designated lenses. Before you
purchase such accessories, please check your Sigma lens to determine
that it is compatible and that the accessories will function properly with
it.

SETTING THE EXPOSURE MODE

The sigma lens functions automatically after mounting to your camera.
Please, refer to the camera instruction book.

FOCUSING

This lens features Sigma’s built-in Hyper Sonic Motor (HSM). The HSM
enables quick and quiet autofocusing.

《SIGMA AF and CANON AF》
For autofocus operation, set the focus mode switch on the lens to the “AF”
position (fig.2). If you wish to focus manually, set the focus mode switch on
the lens to the “M” position. You can adjust the focus by turning the focus
ring.

《NIKON AF , PENTAX AF, SONY and FOUR THIRDS》

For autofocus operation, set the camera to AF mode and set the focus
mode switch on the lens to the “AF” position (fig.2). If you wish to focus
manually, set the focus mode switch on the lens to the “M” position. You
can adjust the focus by turning the focus ring. (In the case of Four-Thirds
cameras it is necessary to switch the camera to MF mode as well)

◆ Please refer to camera’s instruction manual for details on changing the

camera’s focusing mode.

◆ For Nikon, Pentax and Sony mounts, it is only possible to use AF with

camera bodies which support motors driven by ultrasonic waves such
as HSM. AF will not function if the camera body does not support this
type of motor.

◆ This lens also permits manual focusing even in the autofocus mode.

With the camera set to the One-Shot AF (AF-S) mode, it is possible to

manually override the autofocus while the shutter release button is
pressed halfway.

◆ When operating this lens in manual focus mode, it is recommended that

correct focus be confirmed visually in the viewfinder rather than relying
on the distance scale. This is due to possible focus shift resulting from
extreme changes in temperature which cause various components in
the lens to expand and contract . Special allowance is made for this at
the infinity setting.

DEPTH OF FIELD SCALE

The depth of field scale helps you to check the depth of field (the zone of
sharpness) of your compos ition. For example in figure (3), the depth of
field zone is shown when the aperture F16 is used.

LENS HOOD

A bayonet type detachable hood is provided with the lens. This lens hood
helps to prevent flare and ghosted images caused by bright illumination
from outside the picture area. Attach the hood and turn clockwise until it
stops rotation. (fig.4)

◆ When taking photographs using the built-in flash, it is advisable to

remove the lens hood so as to avoid cutting off any of the flash output,
which could cause a shadow in the picture.

◆ In order to place the lens and hood into the storage case, you must first

remove the hood, then replace it on the lens in the reverse position.
(fig.5)

FILTER

◆ Only one filter should be used at the time. Two or more filters and/or

special thicker filters, like a polarizing filter, may cause vignetting.

◆ When using a polarizing filter with AF camera, use the “circular” type.

BASIC CARE AND STORAGE

◆ Avoid any shocks or exposure to extreme high or low temperatures or to

humidity.

◆ For extended storage, choose a cool and dry place, preferably with

good ventilation. To avoid damage to the lens coating, keep away from
mothballs or naphthalene gas.

◆ Do not use thinner, benzine or other organic cleaning agents to remove

dirt or finger prints from the lens elements. Clean by using a soft,
moistened lens cloth or lens tissue.

◆ This lens is not waterproof. When you use the lens in the rai n or near

water, keep it from getting wet. It is often impractical to repair the
internal mechanism, lens elements and electric components damaged
by water.

◆ Sudden temperature changes may cause condensation or fog to appear

on the surface of the lens. When entering a warm room from the cold
outdoors, it is advisable to keep the lens in the case until the
temperature of the lens approaches room tempe rat ure.

TECHNICAL SPECIFICATIONS

Lens construction 6 – 8
Angle of View 46.8°
Minimum Aperture 16
Minimum Focusing Distance 45cm (1.48 ft)
Magnification 1:7.4
Filter Size 77mm

Dimensions Dia.×Length
Weight 505g (17.8 oz)

Dimensions and weight include the SIGMA mount.

84.5×68.2mm (3.33×

2.69 in)