- #CANON 7D REVIEW KEN ROCKWELL FULL#
- #CANON 7D REVIEW KEN ROCKWELL ISO#
- #CANON 7D REVIEW KEN ROCKWELL PLUS#
It's equivalent to Canon's "IS" (Image Stabilization and Nikon's "VR" (Vibration Reduction) systems. " OS" in the name of the Sigma 50-500/4.5-6.3 OS HSM is the designation uses on its Optically Stabilized lenses. The maximum aperture of the Sigma 50-500/4.5-6.3 OS HSM varies with focal length as follows:
#CANON 7D REVIEW KEN ROCKWELL FULL#
Though Canon shut off AF with lenses slower than f5.6, Sigma have a work-around in their electronics which allows full AF operation even at focal lengths where the maximum aperture is f6.3 (which is 1/3 stop slower than f5.6).
#CANON 7D REVIEW KEN ROCKWELL PLUS#
However the Sigma 50-500/4.5-6.3 OS HSM gives you a focal length range which would require 2 or 3 faster lenses, plus the $1600 cost makes it a good deal cheaper than a set of faster zooms and/or primes covering the same range (not to mention lower size and weight).
#CANON 7D REVIEW KEN ROCKWELL ISO#
The relative slow maximum aperture (f4.5 at 50mm, f6.3 at 500mm) does mean that you may need to use a slightly higher ISO setting then you might with some other lenses in this focal length range and the background won't be as blurred as it would be with a lens like a 70-200/2.8 or fast prime. At the shorter end it's usable for portraits and travel shots, while at the long end of the range it's excellent for sports and wildlife.
The wide focal length range of the Sigma 50-500/4.5-6.3 OS HSM means that it can be used for just about anything other than wideangle shots. SLD glass is Sigma's "Special Low Dispersion" glass and its use results in lowered chromatic aberration and increased image sharpness. The Sigma 50-500/4.5-6.3 OS HSM uses 22 elements in 6 groups with 2 large and 2 small SLD glass elements. I presume if you are careful that a polarizer could be used with the adapter, just don't screw it in too tight! There is no provision for using rear mounted filters. Polarizers might be difficult to "unstick" since they have a rotating element which could make gripping them a little tricky. I'm not 100% sure why, but the filter adapter is plastic and I guess it's possible the filter could become stuck.
Sigma caution against using the adapter with polarizers because the filter may be hard to remove. If the filter adapter is used with the lens mounted on a full frame camera it would result in severe vignetting (dark corners). Sigma do supply an adapter which allows the use of smaller, 86mm, filters which can be used when the lens is mounted on an APS-C crop sensor camera. Sigma 50-500/4.5-6.3 OS HSM Specificationsĥ0-180 cm / 19.7-70.9 in (depends on focal length setting)ĩ5mm (adapter for 86mm filter included for use with APS-C DSLRs)ġ:3.1 (at around 200mm and a focus distance of 60cm)Ĭanon, Nikon, Pentax, Sony/Minolta and Sigma The OS version has closer focusing (and higher maximum magnification) as well as 2 more lens elements. A similar (but not optically identical) non-stabilized version (the Sigma 50-500/4-6.3 HSM) was available for around $1000, but that lens has now been replaced by the stabilized version. The list price of the Sigma 50-500/4.5-6.3 OS HSM is $2400, but it's widely available via the major discount stores for around $1500. When mounted on a Canon APS-C crop sensor DSLR (Digital Rebel, 50D, 7D) the 1.6x focal length multiplier results an a lens with the same field of view as an 80-800mm lens would have mounted on a full frame camera. I tested the Sigma 50-500/4.5-6.3 OS HSM on Canon EOS cameras (EOS 40D crop sensor and EOS 5D full frame), but it is also available in mounts for Nikon, Sony/Minolta, Pentax and Sigma's own DSLRs, which pretty much covers all full frame and APS-C sensor cameras, leaving out only the Olympus four-thirds sensor cameras. Sigma 50-500 OS HSM at 500mm, Canon EOS Digital Rebel T2iĪll these lenses have full frame coverage so they can be used on both full frame and crop sensor DSLRs. In 2014 a number of long zooms were announced and/or released including the, the and the, but again these are only 4x zooms. Canon have their and, but that's only 4x. The is the largest range (10x zoom)long telephoto (500mm) produced available for use on (D)SLR camera bodies.