Re: Enlarger lens options.

Richard Knoppow wrote:

> I think you may be right that its the screens which are made at an angle
> rather than the aperture, its been too long since I learned about this
> stuff and the books are not handy.

> Soft dot edges have always been a problem. Monckhoven's intensifier was
> intended to remedy this. It has the peculiar property of being both an
> intensifier and reducer because the cyanide will dissolve the low
density
> silver before the intensifier works so the net result is to increase the
>  contrast of the edges of the dots.
> 
I know F.E.Ives used special treatment of the negatives, and careful
control
of their condition for best results. They did not have litho film in those
days. They do now (for a while more, at least), so I make contact prints
of
the soft-dot stuff onto another piece of litho film and that makes
hard-dots. Exposure is tricky at first, because if you change the
exposure,
you change the diameter of the dots. I make some 50% dots (my densitometer
will measure % dot area) and make the contact prints 50% also -- or pretty
close anyway.

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