Archived posting to the Leica Users Group, 2009/11/18

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Subject: [Leica] Forscher's lights
From: h_arche at (H. Ball Arche)
Date: Wed, 18 Nov 2009 04:59:03 -0800 (PST)
References: <>

You're kind of going both ways - yeah the flash is going to bring in info to 
the shadows, and so bring down the black, but then the bump is going to 
'blow' the highlights. Since the film is so damn slow, you've got time to 
play with both ends and figure your percentages. Halftones that that only 
have a main exposure are usually pretty flat.

Kodak still make a whole range of lith films, but I wonder if they are doing 
any fresh research with them. I guess they're still being used in 
specialized industries, but in the print biz, is anyone still shooting 
traditional halftones? 

----- Original Message ----
From: Mark Rabiner <mark at>
To: Leica Users Group <lug at>
Sent: Wed, November 18, 2009 6:47:31 AM
Subject: Re: [Leica] Forscher's lights

> You're making a neg, so you're giving the highlights a chance to fill-in 
> with
> the bump, and bringing up shadow detail with the flash, depending on the
> duration of each exposure.
> Yeah, lith film has no toe or shoulder, but the halftone screen you're
> exposing through is continuous tone. Being so slow (ASA 2?) the threshold 
> is
> pretty long.
> ----- Original Message ----
> From: Mark Rabiner <mark at>
> To: Leica Users Group <lug at>
> Sent: Tue, November 17, 2009 8:47:07 PM
> Subject: Re: [Leica] Forscher's lights
>> Back in the lith film/process camera days this was standard procedure in
>> shooting halftones; there was a bump, which was a brief exposure of the 
>> film
>> with out the overlaying dot screen, and the flash, which usually came 
>> after
>> the main exposure, and was exposed through the dot screen. The idea was to
>> punch up contrast.
>> The flash lamp hung above the back of the camera, hooked to a timer, and 
>> the
>> exposure took place with the camera back dropped and the film held in 
>> place
>> on
>> the vacuum back.
> Or is it punch Down the contrast?
> Mark William Rabiner

I've done them but its been awhile. I used to teach it in a community
college.  Still think your bringing in more information by doing that and in
effect lowering contrast.

Mark William Rabiner

Leica Users Group.
See for more information


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