Archived posting to the Leica Users Group, 2002/04/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]on 22/4/2002 4:24 pm, Doug Herr at owner-leica-users@mejac.palo-alto.ca.us wrote: > I did a crude test of the ELPRO lenses on the 180mm f/4.0 Elmar-R this > weekend, by focussing on a plastic ruler with the ELPRO lenses attached. > The flaws in this test include the non-100% viewfinder of the SL but for a > first approximation it will do. I used earlier Series VII ELPRO lenses with > a cheap adapter from a swap meet junk bin to fit the ELPRO on the E55 lens. > > The ELPRO VIIb (ELPRO 4 in E55-ese) with the lens at infinity gives an > object field about equal to that of the 180mm lens alone at the minium focus > distance (longer than the plastic ruler, however). With the same ELPRO and > the 180 at its minimum focus distance, the long side of the viewfinder > showed ~120mm of ruler. > > The ELPRO VIIa (a.k.a. ELRPO 3) on the 180 with the 180 at infinity showed > about 120mm of ruler in the viewfinder, and just over 70mm in the viewfinder > at the minimum focus distance. > > Preliminary conclusion: ELPRO 3 & 4 with the 180mm Elmar-R will provide a > wide range of close-up options with minimal gaps or overlaps to something > approaching 1:2 reproduction ratio. Sounds handy. No image quality data > yet. Sorry to be slow in coming forward with the Leica information which I've oddly enough just compiled for my college work. ELPROs with 180mm f4 Elmar-R Elpro Focus distance Repro Ratio object field (mm) 4 inf 135cm 1:7.4 178x267 4 1.8m 75 1:3.3 80x120 3 inf 61 1:3.3 80x120 3 1.8m 45 1:2 48x72 Data from Theo Kisselbach's Leica R-4 Reflex manual. Hope this helps David Prakel - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html