Archived posting to the Leica Users Group, 2001/10/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks Doug and Don, not only are you kind and patient, but I actually understand your replies. At least I think I do : there are more things I need to buy! Right? Thanks, guys! t > From: "telyt@earthlink.net" <telyt@earthlink.net> > Reply-To: leica-users@mejac.palo-alto.ca.us > Date: Sat, 20 Oct 2001 21:16:00 -0400 > To: "leica-users@mejac.palo-alto.ca.us" <leica-users@mejac.palo-alto.ca.us> > Subject: RE: [Leica] dumb question > > trish ternahan wrote: > >>>> > Would some kind and patient Lugger please explain the following > items and > how to use them? > > bellows > APO extension 1.4 > 2X APO extender ROM > macro adapters > Right angeleviewers? > anything else in this general category > <<< > > Seeing as no kind and patient LUGgers have responded, I'll give it a > go: > > APO extenters, both 1.4x and 2x, increase the effective focal length of > the lens without changing the focussing range. If you were to use a 2x > extender on the 60mm Macro, you'd effectively have a m120mm lens > that focusses from infinity to Very Close. Since the 60 by itself > focusses close enough for a 1:2 reproduction ratio, and the 2x extender > doubles the magnification at any given distance, the 60+2x extender > focuses close enough to give you a 1:1 reproduction ratio. The 1.4 > extender would produce a lesser effect except for a peculiarity of its > design: The front elements protrude beyond the lens mount, so only a > few of the longer lenses may be used with this extender w/o damaging > stuff. The 60 ain't one you can use with the 1.4x extender. > > Since ROM doesn't do anything on your R6 you choice between ROM > and non-ROM would be based on the best deal you can get. > > A macro adapter is a fancy name for extension tube. It goes between > the camera and lens, just like the extenders do, but the only think it > does is change the focussing range. You lose infinity focus but gain an > even closer minimum focus distance. How close depends on the > length of the extension tube, the focal length of the lens and how close > the lens can focus normally. In general a longer extension tube gets > you closer, and given a particular extension tube, a shorter focal length > lens will get you closer. The biggest problem with using shorter > lenses for close-up photos is lighting. A bellows is a variable-length > extension tube that IMHO is too fragile for my typical use outdoors. > > Right-angle viewers are handy when your camera is stuck to a copy > stand and you want to see in the viewfinder without climbing on the > table and squatting over the camera with your rear end threatening to > knock yesterday's pizza and stale Jolt onto the persian carpet. The > right-angle thingie allows one to maintain a civilized posture while > focussing the camera. > > There are also ELPRO close-up lenses that screw into the filter > threads of R lenses that have E55 filter threads. They're quite handy for > the occasional close-up photo but unless you stop the lens down a few > extra stops the image quality won't be as good as your 60 (marvelous > lens, BTW) with extension tubes. > > Doug Herr > Birdman of Sacramento > http://www.wildlightphoto.com > > -------------------------------------------------------------------- > mail2web - Check your email from the web at > http://mail2web.com/ . > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html