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

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Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM lens

Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM lens

Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM lens

MTF-charts

Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM MTF Chart

Optical design

Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM optical design

Format: APS-C (crop)

Type: Prime lens

Focusing: Auto Focus (AF)

Lens mounts: Canon EF, EF-S, Sony A / Minolta A, Nikon F (FX, DX), Pentax K, Sigma SA

First year of production: 2007

Optical design: 13/9 (1 SLD)

Features: Ultra-Sonic Motor, Fisheye lens
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Owners (2)

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Average price: $1043

Specifications:

Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)
4.5mmf/2.8f/2260.135 470/16,678/3,1

Additional information:

The Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM

  • angle of view 180°
  • Diameter 76.2 mm
  • max. magnification 1:6
  • minimum working distance 1.9 cm (19 mm)

The Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM is a fast superwide-angle lens of the circular fisheye type with an HSM autofocus drive. It has been specially designed for small-format digital SLR cameras and cannot be used on full-format and film cameras.

The optical scheme of the lens includes one SLD element in the rear group made of super low dispersion glass for correction of chromatic aberration. The super multi-coating optimized for digital cameras decreases flare and halation, and corrects color  rendering.  The  hyper-sonic motor  AF drive provides noiseless and high-speed autofocusing with the possibility of  full-time manual focusing without switching to the manual mode. The lens has an internal focusing.

The Circular Fisheye produces a circular 12.3 mm image with an angle of view of 180° at the center with a black surrounding frame. An image like that is beyond human eye's ability, but can be successfully used in photography. The lens has a very large depth of field.

A very large angle of view does not make it possible to use screw mount filters. Filters are attached to the rear of the lens. A gelatin filter holder and  72 mm cap adapters are completed with the lens.


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Posted by: dv   Date of publication: 01.11.2010


Mechanical quality4.673
Optical quality4.254
Usability3.754
Pricing / Value1.254
Bokeh1.504
Overall lens rating
3.08

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