Sigma’s Fisheye Duo; The Sigma 4.5mm f/2.8 EX DC HSM & 10mm f/2.8 EX DC HSM (Motor-In) Lenses
George Schaub, August, 2008
If you ever want a unique point of view try a “fisheye” lens. Like
looking through a door peephole (which in fact is a “fisheye” type)
this order of lens sacrifices linear correction in favor of a very wide angle
of view. Originally made for creating “full sky” images when pointed
straight up, they had long ago been adopted by photographers for creation of
decidedly different points of view, and, today, even doing QuickTime movies
to display the interior of a condo or vacation home.
City Scene |
|
Both
lenses deliver an incredible 5.3” minimum focusing distance
which, when combined with a fairly narrow aperture, can yield a
very deep depth of field. This tile on a World Trade Center commemorative
fence on New York’s Seventh Avenue was photographed with the
4.5mm fisheye from about 8” away; exposure at ISO 200 was
f/16 at 1/125 sec. Note that all images shown are cropped so that
image circle reaches borders of frame.
All Photos © 2008, George Schaub, All Rights Reserved |
|
The fisheye look is an acquired taste, albeit one that has an immediate seductive
quality. While you can correct some of the inherent distortion using various
programs, the point is not to create a “straight” image with a very
wide angle of view but to enjoy the ride of this “beyond peripheral vision”
optic. There are two types of fisheye: one rectilinear, with the standard rectangular
frame and less angle of view, and the other hemispherical, the type featured
in the new lenses from Sigma.
Close-Up & Foreshortening |
|
I walked around midtown Manhattan with the Sigma 10mm f/2.8 lens
making a bit of a spectacle of myself with the odd shooting postures
the lens encourages, but this of course caused no stir on the streets
of New York City. This lens makes the camera “candid,”
as when you point it up over the horizon the super-wide field of
view also includes the street level, and no one’s the wiser.
Exposure at ISO 200, f/11 at 1/250 sec. |
|
One of the truly amazing qualities of the fisheye is the almost ridiculous
depth of field available at even modest apertures. As you know, one of the determinants
of depth of field is the focal length of the lens, and when you use either a
10mm or 4.5mm focal length (with a minimum close focusing distance of 5.3”
in both lenses) at even f/8 you get sharpness from 3 ft to infinity with ease.
Add the amazing amount of foreshortening these lenses afford (the seeming enlargement
of close subjects when focused close in relation to the distant background)
and the picture possibilities are fairly mind-boggling.
Looking Up |
 |
Rectangular Crop |
|
The towering skyscrapers in midtown New York City are made even
more impressive, and somewhat more claustrophobic feeling, when
exploiting the severe barrel distortion of these lenses. Once you
start shooting with a fisheye you get hooked into a decidedly different
point of view. If you want to make a “normal” bordered
print out of it, most any software with perspective and distortion
control can do the trick, admittedly creating a smaller file size
due to the cropping that needs to take place. This shot was made
with the 10mm f/2.8 lens with an exposure of f/16 at 1/125 sec,
and -0.5 EV, at ISO 200. |
|
The 4.5mm f/2.8 lens (MSRP $1400, less in many outlets) is said by Sigma to
be the first 180° circular fisheye made specifically for APS-C D-SLRs, and
the HSM (motor built into the lens) opens this up for users of those cameras
without built-in lens
motors, such as the Nikon D40X used in this test. Yielding an 180° angle
of view, the unit is fairly small (3x3.1”) and lightweight (about 16 oz).
Available in Canon, Nikon, and Sigma mounts, it’s constructed of 13 elements
in nine groups. Being of the DC variety, it utilizes SLD (Special Low Dispersion)
glass and is super coated to minimize ghosting and flare.
|
