Sigma 4.5mm f/2.8 EX DC HSM Circular Fisheye Lens
The very first
Circular
type Fisheye Lens designed exclusively for use on
APS-C DSLR cameras, The Sigma 4.5mm F2.8 EX DC HSM
An autofocus circular fisheye with a 180 degree viewing angle in every direction. It was exclusively engineered for
DSLR cameras that have an APS-C image sensor. When mounted on DSLRs having an APS-C size sensors, it creates circular images totally within the frame.
It has a large
f/2.8
aperture which produces brilliant images in the
viewfinder while letting
photographers capture images in
poor lighting situations making it a perfect lens for Aurora and Astrophotography photography.
Because of the quantifiable angle to area relationship it creates, the lens has the capacity to be used for arts and scientific purposes, like measurements of solid angles of cloud distribution above the sky or distribution of
vegetation in a forest.
A minimum focusing range of 5.3 inches along with a maximum magnification ratio of 1:6 makes it especially useable for close-up shooting
.
Special Low Dispersion (SLD) glass delivers effective correction for
chromatic aberrations. The Sigma Super Multi-Layer Coating diminishes ghosting and
flare . It features inner focusing which allows good image quality and high definition over the entire frame.
The Sigma Hyper Sonic Motor (HSM) guarantees quick and silent auto focusing with all-the-time manual focus override by simply rotating the focus ring.
HSM means this lens will autofocus on Nikon D40/D40x,
Nikon D60, Nikon D3000,
Nikon D3100,
Nikon D5000 and the Nikon D5100 DX Cameras
November 14, 2007
A fisheye lens captures a wide, hemispherical image on the extreme side. Initially developed for meteorology use in studying formations of clouds and labeled as "whole-sky lenses", these fisheye lenses fast became popular for all around photography because of the unique, distorted appearance of photographs they captured.
They are typically used by photographers acquiring broad landscapes that suggest the earth's curve. Hemispherical photography is also used for an array scientific purposes in studying the geometry of plant canopy and for calculating solar radiation near the ground.
The first fisheye lenses which were created were "circular fisheyes" type lenses which capture a 180° hemisphere which shows as being a circle within a film or sensor frame. A few circular fisheyes can be acquired in orthographic projection versions for scientific applications. These lenses feature a 180° vertical viewing angle, while the diagonal and horizontal viewing angle are also 180°. The typical circular fisheye lens covers a lesser image circle as compared to rectilinear lenses, allowing the frame corners to be completely dark.
Buy the Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM Lens from
•
Adorama
•
Amazon
•
ebay
Nov 18, 2011
Alternative Fisheye Lenses
Features
• The first 180 degree circular fisheye lens designed specifically for APS-C size digital SLR cameras
• Fast F2.8 maximum aperture making it ideal for low light photography
• Minimum focusing distance of 13.5cm and a maximum magnification of 1:6
• SLD glass minimizes color aberration
• Equipped with HSM with full-time manual focus override
• Equisolid angle projection method is possible for art and scientific use
Lens Includes
• Front Cap Adapter
• Lens Case
• 1 Year International Warranty plus 3 Year Sigma U.S.A. Extended Warranty (Total Warranty is 4 Years from Date of Purchase)
SIGMA 4.5mm F2.8 EX DC Circular Fisheye HSM
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