[Leica] Forscher's lights

[h_arche at yahoo.com (H. Ball Arche)]

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 rabinergroup.com>
To: Leica Users Group <lug at leica-users.org>
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




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