Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Sony Digital DSLR Camera

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Price: $1,509.00    

Product Feature

• Construction 16 Groups /22 Elements Angle of view 46.8� - 5� F stop range 22 Closest Focusing Distan with 3 year warranty

Product Description

New Sigma APO 50-500mm F4.5-6.3 DG OS HSM. This is a 10x high zoom ratio ultra telephoto zoom lens incorporating Sigma's original Optical Stabilizer function. This lens covers a wide range of focal lengths from 50mm to 500mm ultra telephoto. The OS (Optical Stabilizer) function offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. For Sony and Pentax mount, the built-in OS function of this lens can be used even if the camera body is equipped with an image sensor shift anti-shake system. As compensation for camera shake is visible in the view finder, the photographer can easily check for accurate focus and ensure there is no subject movement. Four SLD (Special Low Dispersion) glass elements provide excellent correction of color aberration. The Super Multi-Layer Coating reduces flare and ghost and ensures high image quality throughout the entire zoom range. This lens has a maximum magnification ratio of 1:3.1 (at the focal length of 200mm) making it ideal for close-up photography. This lens incorporates HSM (Hyper Sonic Motor), ensuring quiet and high speed AF as well as full-time manual focus capability. The addition of the optional 1.4x EX DG or 2x EX DG APO Tele Converters produce a 70-700mm F6.3-8 or a 100-1000mm F9-12.6 MF zoom lens respectively. This lens is equipped with a Petal-type hood to block out extraneous light. The filter size of this lens is 95mm and the lens is supplied with a step down ring enabling digital cameras with an APS-C size image sensor to use an 86mm filter. *It is not possible to use a Polarizing filter with the step down ring. If you attach a Polarizing filter, you may not be able to remove it from the lens again. *For Pentax and Sony mounts, it is not possible to use the AF and the built-in OS function of this lens when attaching it to film SLR cameras as well as Pentax K100D. *Nikon and Pentax mounts do not have an aperture ring. Some functions may not work depending on the camera model.

Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Sony Digital DSLR Camera Review

Just received the lens. Using with a Cannon EOS XTi.

Pros
- Sturdy feel to the lens
- Impressive focal length range.
- Good picture quality throughout the range (speaking as a non-pro)
- OS pretty good. Taking acceptable quality hand-held shots at full extension in bright sun.

Cons
- Autofocus not working out-of-the-box. Of note that this lens was NOT in the serial number range specified by SIGMA's customer alert.
- Very poor response time on queries to SIGMA's tech service.
- Some (minor) vignetting noticable at longer focal lengths.
- Does not work with my TAMRON teleconverter even though this TC does function with my Cannon lens.
- Heavy

Returning the lense for replacement through AMAZON due to the autofocus issue. Will see how well the next one does.

UPDATE:
Received replacement lense from AMAZON with working autofocus. Took it out today for extensive testing and am well pleased so far. Focal range is impressive and am getting good shots throughout the range. OS function gives reasonable good shots even when hand held at 500MM. Normally use with a monopod however.

Tempted to upgrade my rating from 2 to 4 stars however will leave it at 3 for time being. Issues:
- Continued poor SIGMA customer service. My email requesting Tech assistance after first lens' failure is now 5 days old with no response from SIGMA. In same period I returned original lens to AMAZON, got a replacement and tested it (kudos to AMAZON Customer Service). Had similar poor response experience with SIGMA when I was originally researching the lens.
- Some residual caution about reliability of the autofocus function. Seems to be a fairly common issue with this lense. I'll withhold judgement until I have a bit more field experience with the lens.

NEW UPDATE:
Took lens overseas for several weeks of heavy-duty use. Still pleased. A few (minor) comments:
- Autofocus still working however does tend to have difficulty in finding the perfect focus point for "busy" backgrounds. Tend to use manual focusing a bit more than I would like.
- Range for this lens is impressive as previously indicated. Great for wildlife photography. The 50MM low end is however not quite good enough for the wide/scenic shots. Find myself carrying a good point-and-shoot camera to get those scenic vistas as too much trouble to keep changing lenses.
- Never did get a response from SIGMA tech service. Academic now - however can't help wondering if they really exist. Not looking forward to dealing with SIGMA if the lens ever needs maintenance.

YET ANOTHER UPDATE
Currently 1.5 years after purchase. Autofocus not functioning. 12 days turnaround time for repairs through SIGMA New York -- with $44 to FEDEX for shipping/boxing. Better impressed with SIGMA customer service than I have been in the past.

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