Archived posting to the Leica Users Group, 2002/04/22

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Subject: [Leica] Re: Leica Users digest V22 #190
From: David Prakel <dgp@btconnect.com>
Date: Mon, 22 Apr 2002 22:10:27 +0100

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



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