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notsotechie · 03-07-2008

Well I googled and found this on the sigms website Not sure if this helps

RF (Rear Focus)
This lens is equipped with a system that moves the rear lens group for highspeed , silent focusing

DG (DG Lens)
These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.

03-07-2008	#2 (permalink)
notsotechie Dromedary Location: Calgary-Alberta Posts: 1,542 CamelKarma: 271 Editing OK?: Ask first Gallery \| Blog	Re: Question About Sigma 50-500mm Well I googled and found this on the sigms website Not sure if this helps RF (Rear Focus) This lens is equipped with a system that moves the rear lens group for highspeed , silent focusing DG (DG Lens) These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.
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