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Re: [OM] RE: Slide duplication -Part 1 (LONG POST)

Subject: Re: [OM] RE: Slide duplication -Part 1 (LONG POST)
From: HI100@xxxxxxx
Date: Mon, 13 Sep 1999 03:53:09 EDT
Ken,
         I copied a few hundred slides (+multiple copies of each) not too 
long back and also used the Ektachrome 5071. 
 Here are a few comments on things I did slightly differently from you 
which may help others contemplating doing this:

* I bought bulk film as the cost differential was so large from seperate
   rolls. (It was a break even but I then landed up with spare film!)
* I used a set of acetate filters I previously used for Cibachrome printing
* I used a Novoflex bellows with enlarger lens at F8 
* I built my own slide holder and diffuser using an old micrometer stage for 
   easy adjustment of cropping. If you build your own, beware of placing 
   the diffuser too close to slide as the depth of field may put details of 
   diffuser surface onto clearish sections of slide like the sky.
* I used OTF Flash for trans-illumination and made adjustements to the filter 
  pack  for color temperature accordingly. (Previously I have used a slide 
  projector as light source). I adjusted the diffuser effective density by
  putting  layers of tissue   paper over the flash to get mid range dump 
values  
  from the flash.  (Watch the flash recycle time (to light on) to estimate 
  amount of energy used) 
* Flash has some advantages : 
  1)The flash eliminates any chance of camera vibration killing sharpness.  
  2)The color temperature of the flash is not dependent on line voltage as 
   the incandescent lamp is. (unless you use a voltage stabilised enlarger 
   as lamp source.)
* I used a high intensity lamp on gooseneck to illuminate the diffuser 
   for accurate focussing + the OM varimagnifier. Helps for older eyes.
* The color temperature of the flash is not dependent on line voltage as 
  the incandescent lamp is. (unless you use a voltage stabilised enlarger 
  as lamp source.)
* The 5071 film speed is meant to be determined for the film batch by 
  trial and error so you are meant to do a test roll for your particular 
setup.    
  The nominal EI from Kodak depends on film batch and is printed 
  on the box. (mine was 25ASA)  I had the impression the film may 
  suffer from reciprocity failure more easily than regular film.  

Tim Hughes
Hi100@xxxxxxx

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