[was: Vivitar Series One 28/1.9 PK for $60?] >> there is at least another rare VS1 zoom - the 70-210/2.8-4 QDOS >> novelty.
> What`s the deal on this lens, I have a 70-210/2.8-4 (used it > tonight as a matter of fact), is the QDOS a different beast, or is > it just hype? I seem to remember one on ebay, was it a 3D claim? Well Steve, there are five VS1 70-210 lenses altogether, as far as I can tell. First, there have been four "regular" VS1 70-210 lenses: 1. The first 70-210/3.5 version, with 67mm filter threads, and with two obvious "prongs" used to shift into macro mode. 2. The second 70-210/3.5 version, with 62mm filter threads. 3. The first 70-210/2.8-4 version (and third 70-210 version), with multiple DOF lines fanning out toward the zoom/focus ring. 4. The second 70-210/2.8-4 version (and fourth 70-210 version), with multiple DOF lines fanning out toward the aperture ring. But, then, there is also the QDOS version, which appears to be identical to #4, except for the additional hardware to provide the QDOS 3D effect to images (which can be enabled and disabled by sliding a switch on the barrel near the mount, sort of like the Manual-Auto switch on some of the newer Takumar screwmount lenses. A side view of the lens - http://www.cetussoft.com/pentax/vqdos/vqdosside.jpg A front view of the lens - http://www.cetussoft.com/pentax/vqdos/vqdosfront.jpg The slide switch set for normal lens use - http://www.cetussoft.com/pentax/vqdos/vqdosnormpos.jpg A view from the rear of lens when set for normal use - http://www.cetussoft.com/pentax/vqdos/vqdosrearn.jpg The slide switch set for QDOS use - http://www.cetussoft.com/pentax/vqdos/vqdosqdospos.jpg A view from the rear of lens when set for QDOS use - http://www.cetussoft.com/pentax/vqdos/vqdosrearq.jpg The two manuals supplied with lens (one of which is just the "regular" (fourth) VS1 70-210 manual) and the front and back of the cardboard-framed viewing glasses also supplied (not shown are the plastic QDOS "sunglasses style" viewing glasses and the plastic QDOS "clip-on style" viewing glasses also provided) - http://www.cetussoft.com/pentax/vqdos/vqdospaper.jpg A photo taken using the QDOS setting (which won't make a whole lot of sense when viewed without a clear piece of red glass or plastic in front of your left eye and a clear piece of blue glass or plastic in front of your right eye) - http://www.cetussoft.com/pentax/vqdos/vqdos01.jpg Weird, eh? Just like ol' 3D comic books - <g>. Fred
