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

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] RE: ELPROs with 180mm f4 Elmar-R
From: "telyt@earthlink.net" <telyt@earthlink.net>
Date: Mon, 22 Apr 2002 17:21:13 -0400

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