Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM Lens User Guide

 
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. 

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. 

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. 

The Sigma lens functions automatically once attached to the camera.    Please refer to the 
camera instruction book. 

This lens features Sigma’s built-in Hyper Sonic Motor (HSM).    The HSM enables quick and 
quiet autofocusing.    For autofocus operation, set the focus mode switch on the lens to “AF” 
position (fig.2) (Select the autofocus mode on your camera body for Nikon AF).    If you wish 
to focus manually, set the focus mode switch on the lens to the “MF” position (for Nikon AF, 
select the manual focus mode on your camera body as you would do normally).    Manual 
focus can be achieved by turning the focus ring. 

 

◆  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. 

◆  The viewfinders of some Nikon AF cameras have indicators to display the focus status.   

The “

● ”  symbol indicates that correct focus has been set, “

►

”  indicates that focus is 

set in front of the subject, and “

◄

”  indicates that focus is set behind the subject.    When 

this AF lens is used with Nikon AF cameras in MF mode, please adjust the lens’ focus 
until the “

● ”  symbol is visible. 

◆  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. 

This lens has a detachable tripod socket.    When the locking knob on the collar is loosened, 
the lens and camera can rotate freely to easily position the camera horizontally or vertically 
(fig. 3). 
To remove the tripod collar from the lens, first loosen and then disengage the locking knob. 
(fig. 4) 

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. 

The depth of field scale helps you to check the depth of field (the zone of sharpness) of 
your composition. For example in figure (5), the depth of field zone is shown when the 
aperture F16 is used.   

 

◆  The depth of field scale can be used at a focal length of 70mm only. 

The lens can be used with Sigma’s 1.4x EX or 2.0x EX Apo Tele Converters (optional), 
becoming a 98-280mmF4 Autofocus telephoto zoom lens or a 140-400mm F5.6 Autofocus 
telephoto zoom lens respectively. 

 

◆  Do not use other manufacturers’ teleconverter’s, only those listed above are compatible. 

◆  We recommend the DG APO Tele-Converters when using with DSLR cameras. 

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.6) 

 

◆  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.7) 

◆  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. 

◆  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 using the lens in the rain or near water, prevent 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 temperature. 

 

Lens construction 

15 – 18 

Angle of View 

34.3 – 12.3° 

Minimum Aperture 

22 

Minimum Focusing Distance 

1m (3.28 ft) 

Magnification 1:3.5 
Filter Size 

77mm 

Dimensions Dia.

×Length 86.6×184.4mm (3.41×7.26 in) 

Weight 

1345g (47.4 oz) 

Dimensions and weight include the SIGMA mount. 

 
 

The CE Mark is a Directive conformity mark of the European 

Community (EC). 

SIGMA (Deutschland) GmbH Carl-Zeiss-Str. 10/2, D-63322 Rödermark, F.R.GERMANY 

Verkauf: 01805-90 90 85-0 Service: 01805-90 90 85-85    Fax: 01805-90 90 85-35

 Tripod Socket 
 Lens Hood 

 Filter Attachment Thread
 Focus Ring 
 Distance Scale 
  Focus Index Line 

 Zoom Ring 
 Focus Mode Switch 

(Sigma SA and Canon AF only) 

 Mount