Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM Lens Guía Del Usuario (en)

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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) 
NIKON AF TYPE CAMERAS 
This lens functions in the same 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 the camera manufacturer’s 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.   
◆  While changing the lens, be sure to place it front end down to avoid damaging the 
rear mount. 
SETTING THE EXPOSURE MODE 
The Sigma lens functions automatically once attached to the camera.  Please 
refer to the camera instruction book. 
FOCUSING AND ZOOMING 
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, and SONY》 
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. 
 
◆  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. 
 
Zooming》 
Rotate the Rubber grip on the zoom ring to the desired position. 
ZOOM LOCK SWITCH 
This lens is also equipped with Zoom Lock Switch to eliminate the zoom creep 
when the lens is tilted down. Please set zooming ring to 120mm and set the 
zoom lock switch to the “LOCK” position, (fig.3), however, please slide the lens 
to the “UNLOCK” position from “LOCK” position, before taking the picture. 
ABOUT OS (OPTICAL STABILIZER) FEATURES 
(except Pentax AF and SONY mount) 
This OS (Optical Stabilizer) lens effectively compensates for image blurring 
caused by camera shake. 
With this lens, you can take pictures at shutter speeds approx 4 steps slower 
than you could without using the OS function of this lens and can get sharp 
results. 
Set the OS
(Optical Stabilizer)switch to Mode (fig. 4). Press the shutter button 
halfway down, confirm the image in the viewfinder is stable then take the picture. 
(It takes approximately 1 second to produce a stable image, after pressing the 
shutter button halfway). Mode 2, detects the vertical camera shake, and 
overcomes blurring. It is effective on subjects moving horizontal to the camera. 
◆  The blurring compensation function of Optical Stabilizer is effective for 
hand-held shooting. In the following conditions, Optical Stabilizer may not 
function properly. 
▪ Shots from the a moving vehicle        ▪ If there is a considerable camera motion 
or shake. 
◆  Please do not use Optical Stabilizer in the following situations. 
▪ When the lens is mounted on a tripod.      ▪ Bulb (long time exposure). 
◆  Optical Stabilizer function is powered from the camera. If the OS lens is 
attached to your camera and activated, shooting capacity of your camera will 
be lower than with conventional lenses used with the same camera. If you are 
not using Optical Stabilizer, please turn OFF the OS switch, in order to prevent 
consumption of a battery. 
◆  Be sure to turn of OS switch to OFF position, before attaching or detaching 
the lens to the camera.   
◆  The Optical Stabilizer continues to operate after you release your finger from 
the shutter button, as long as the exposure meter displays the exposure value. 
Never remove the lens or remove the camera’s battery while the image 
stabilizer is operating, you could damage the lens. 
◆  Although the viewfinder image may appear to shake immediately after shooting 
and at the start of the flash charge cycle of the built-in flash of the camera etc., it 
will not cause any effect on pictures. 
◆  If the camera power is turned off or lens is detached while the Optical 
Stabilizer function is in operation, the lens may emit a chattering noise, but this 
is not a malfunction. 
◆  Optical Stabilizer feature can work with the Nikon AF cameras shown in the 
following table. When using this lens with other camera models not listed in 
the following table, please set the OS  Switch to OFF position to cancel the 
Optical Stabilizer function. 
 
Digital SLR Cameras and F6, F5, F100, F80/N80, U (F65/N65), U2 (F75/N75) 
※From our homepage, you can check the latest information regarding the 
camera models, which can be used with Optical Stabilizer function.   
TRIPOD SOCKET AND COLLAR 
This lens is equipped with a tripod socket. When you loosen the locking knob on the 
collar, the lens and camera can rotate freely to easily position the camera 
horizontally or vertically (fig.5). 
HOW TO REMOVE THE TRIPOD COLLAR 
1. It is possible to remove the lens’ tripod socket, for more convenient hand-held 
photography, if desired. To do so, first loosen the tripod collar locking knob, 
and, align the index mark of the collar, with the ▼REMOVE position (fig.6). 
2. Then, pull the tripod collar straight back, as shown in Fig.7, removing the 
collar. 
◆  When you wish to re-attach the tripod collar to the lens, please reverse the 
procedure above. 
◆  Please, do not set the tripod collar to the ▼REMOVE position, except when 
you are removing, or attaching, the tripod collar, as the lens may inadvertently 
detach from the collar and fall.    Also, please remember to tighten the locking 
knob to prevent the lens from rotating unintentionally. 
◆  When the lens is mounted on the camera, the tripod collar cannot be removed 
from the lens. 
SHOULDER STRAP 
Please attach the shoulder strap to the sling as described in figure 8. 
FLASH PHOTOGRAPHY 
The camera’s built-in flash will cause barrel shadow if used with this lens. For 
best results, please only use an external flash unit. 
ABOUT TELE CONVERTERS 
The lens can be used with Sigma’s 1.4x EX or 2.0x EX Apo Tele Converters 
(optional), becoming a 168-560mm F6.3-8 telephoto zoom lens or a 240-800mm 
F9-11 telephoto zoom lens respectively 
(both can be used in manual focus 
only
). 
◆  Do not use other manufacturers’ teleconverter’s, only those listed above are 
compatible. 
◆  The Pentax mount Tele Converter is not compatible with this particular lens. 
◆  We recommend the DG APO Tele-Converters when using with DSLR 
cameras. 
LENS HOOD 
A bayonet type detachable `hood is provided with the lens.  This lens hood 
helps to prevent flare and ghosted images caused by extraneous light.    Attach 
the hood and turn clockwise until it stops rotating. (fig.9) 
◆  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.10) 
FILTER 
◆  Only one filter should be used at a time.    Two or more filters and/or special, 
thicker filters, such as a polarizing filter, may cause vignetting. 
◆  When using a polarizing filter with an AF camera, use the “circular” type. 
BASIC CARE AND STORAGE 
◆  Avoid any shocks or exposure to extreme high or low temperatures or to 
humidity. 
ENGLISH 
  Zoom Lock Switch 
 OS Switch 
(except Pentax AF and SONY mount) 
 Lens Hood 
① Filter Attachment Thread 
② Focus Ring 
③ Distance Scale 
④ Focus Index Line 
 Zoom Ring 
 Focus Mode Switch 
 Mount 
 Tripod Socket