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Sigma 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM

Sigma 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM lens
Sigma 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM lens
 

APS-C sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

One or more Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.

 

Internal Focusing

Internally focusing lenses don't change their size while setting focus.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

 

Supports drop-in filters

Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.

This autofocus circular fisheye lens has an angle of view of 180 degrees in all directions. It is exclusively designed for digital SLR cameras with the APS-C size image sensor. When used in conjunction with digital SLRs with APS-C size image sensors, it produces circular image within the frame. The F2.8 large aperture value produces a bright image in the viewfinder and allows photographers to take pictures in low light conditions, making it an ideal lens for Astrophotography and Aurora photography. Due to the quantifiable angle/area relationship it produces, this lens can be used for scientific and arts applications such as solid angle measurements of cloud distribution over the sky or vegetation distribution of the forest.

Sigma 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM Specification

Available mount(s) Sigma
Application(s) Landscape, Interiors, Architecture, Special effects
Category(s) Fisheye
Multiplier 1.5×
Stabilizer no
Focal length 4.5 mm (prime)
Lens construction 13 elements in 9 groups
Angle of view 35mm: N/A
digital: 180°
Number of blades 6
Maximum aperture f/2.8
Minimum aperture f/22
Minimum focusing distance 13.5 cm
Magnification 0.17×
Filter size N/A
Size ∅ 76.2 × 77.8 mm
Weight 470 g
Notes Equisolid angle projection method is possible for art and scientific use
AF speed N/A
AF sound
Internal focusing yes
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter yes
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle yes
Low dispersion lens element yes
Hard case N/A
Soft case N/A
Lens hood N/A
Tripod adapter N/A
Sigma 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM Specification

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