Minor correction on your terminology - What you have is not a telephoto lens; rather, you have a tele- converter and three extension tubes. The tele-converter, which has one or more lens elements as part of its design, is added between a lens and the camera body, the the extra distance from the body serving to narrow the lens effective field of view (i.e., to make your lens act like a longer (telephoto) lens, and the extra lens element(s) acting to maintain a proper focusing of the image on the focal plane (film or sensor). The extension tubes push the lens away from the body and focal plane, also having the effect of a narrower field of view, hence a magnified image. Without the compensating lens element(s), lenses used with extension tubes can no longer focus beyond a relatively short distance (depending on the length of the tube.)
stan On Aug 26, 2007, at 12:09 PM, Rebekah wrote: > Hey guys > > I've got a telephoto lens and a couple of extenders or extensions (?) > for it that's for a screw mount camera. On the lens it says "APS AUTO > TELEPLUS 3X", and it has a little plastic cap on one end. It comes in > a nice little leather case that says "Kenko" and has three extenders > that come in a leather case that says "AOCO" on it. Since I know > nothing about these objects, here are some photos: > > http://picasaweb.google.com/rg2pdml/PhotoEquip?authkey=ZkVsDjm7WWs > > The lens it self seems to be in near-perfect condition - there's some > dust on it but I honestly can't find any scratches. There are a few > scrapes on the outside, which is in one of the pictures. The > extensions have some slight scrapes but nothing I was able to > photograph and nothing I'd consider significant. The leather cases > seem to be in great condition as well, with some wearing of the > leather on some of the edges. I've done my best to show them in the > pictures. I'm looking to trade for a 49 mm linear polarizing filter, > if anyone has an extra one. > > I also have a hood for a 1:3.5 35mm lens for some reason. The last > few photos online are of this, and it's case, which is really very > nice. I'm willing to trade for that as well, although I have no clue > as to it's value - I suspect little, unless someone adores those > little leather cases. > > rg2 > > P.S. If for some reason you missed it, all the pictures with a ruler > are shown with inches. ;) > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
