Description: Sigma 50-500mm f/4.5-6.3 EX APO DG OS HSM SLD Ultra Telephoto
The newest Sigma f/4.5-6.3 APO 50-500mm HSM DG OS. It's a big 10x high zoom ultra telephoto ratio zoom featuring the Sigma original Optical Stabilizing function.
The lens encompasses a big focal length range from 50mm through a 500mm ultra telephoto. The Optical Stabilizer (OS) feature allows you to select shutter speeds around 4 stops less than might otherwise be possible to do. There are four Special Low Dispersion (SLD) glass elements which provide excellent correction for color aberration. A Super Multi-Layer Lens Coating diminish ghosting and flare while ensuring high image quality right through the total zoom range.
The 50-500 has a max magnification 1:3.1 ratio (at a 200mm focal length) making it just right for close-up shooting. The 50-500 also includes a Hyper Sonic Motor (HSM), ensuring silent and high speed autofocus along with a full-time manual focusing feature. By adding an 1.4x or 2x Tele Converter creates a 70-700mm f/6.3-8 or even a 100-1000mm f/9-12.6 manual focus zoom lens .
The 50-500 comes with a Petal-shape hood to impede inappropriate light. it has a 95mm filter size while the lens also includes a step down adapter ring allowing APS-C image sensor digital cameras to use a smaller 86mm filter.
The Optical Stabilizer (OS) will not function with Nikon and Canon SLR film cameras except for the Nikon F6 and the Canon EOS-1V.
Do not attempt to mount a Polarizing filter and the step down adapter ring together. By attaching a Polarizer filter, you be unable to get it off the lens again
.
On Sony and Pentax mounts, the OS function of the 50-500 lens may be used even while that camera body features an image sensor
stabilization system. While compensation for any camera shake can be seen in the viewfinder, a photographer can easily confirm accurate focus to ensure there's no subject movement.
Did I mention it weighs a ton (actually 4.34
lbs) . You
should use the included wrist strap as your regular camera strap may not be rated for this
much weight.
Also when you attempt to use your camera's built in flash, a shadow
results from the diameter of the lens, although easily fixed by using an
external flash. 
Sep 5, 2011. Announced Feb 20, 2010
Superzoom
The term hyperzoom or superzoom is used to promote photographic zoom lenses with
unconventionally large focal length factors, typically more than 4× and ranging
up to 15×, e.g., 35 mm to 350 mm. The largest ratio for digital SLR cameras is
held by the Tamron 18–270 mm, giving 15×. Some Digital Camera Review by Gene Wrights have even
larger zoom ratios up to 35×. For movie and television use, Panavision holds the
record with their 300X HD Lens.
While superzoom lenses have improved greatly in recent years, they still have a
number of drawbacks in comparison with shorter-range zooms and prime lenses.
Most notable is the much increased likelihood of significant distortions of the
image at both extreme ends of the range. Other potential problems include
smaller maximum aperture and poorer autofocus performance
Following is a list of superzoom lenses, used for 135 format in SLRs or for APS
format in DSLRs. The minimal factor used here is 5× or more. A 28–200 mm has a
75° to 12.3° angle of view, a 28–300 mm (or an 18–200 mm for an APS DSLR) has an
11.1x 75° to 8.2°
Alternative Superzoom Lenses
Features
Sigma upgrades the popular 50-500mm ultra-telephoto zoom with much needed
Optical Stabilization - a welcome addition to such a long lens. Again Sigma
claims the OS offers up to four stops benefit, and works with
Sony and Pentax
SLRs as well as
Canon, Sigma and
Nikon models, with the stabilized viewfinder
image aiding in
focusing and
composition. The all-new optical
design uses 22 elements in 16 groups, including four SLD glass elements, but the
filter size which has has grown to match the lens to a whopping 95mm.
Lens Includes
• Case
• Petal-type Hood (LH1030-01)
• Step down ring
• Shoulder Strap
• Tripod socket TS-31
