Archived posting to the Leica Users Group, 2002/04/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]David Prakel <dgp@btconnect.com> wrote: > 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. Thanks David. So, the crude measurements were close enough for all practical purposes! 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