Archived posting to the Leica Users Group, 1999/02/01

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Subject: Re: [Leica] Enlarging lens
From: RBedw51767@aol.com
Date: Mon, 1 Feb 1999 15:43:51 EST

Joe, I agree with you that there is probably someone among the living LUGGERS
that could shed some light(?) on this topic.

Thanks for your note!

Bob Bedwell



<< Dear Bob,
 Thanks for the note. No, I have no experience of Leica enlarging lenses. I
 am not an expert, and would welcome an expert's opinion. As I said, I'm
 getting better enlargements than ever I got before using the Rodagon lens.
 It would tough to get me to switch, although I'm sure Leica enlarging lenses
 are good, too.
 As to the use of apo lenses for black and white. I have read that apo offers
 advantages in B&W printing because of the apo's lenses ability to focus
 light of three (rather than two) wavelengths on exactly the same plane. If
 some wavelengths of light are focused at a point behind or ahead of the film
 plane, the result will be a fringe or halo around the area of sharp focus
 produced by the properly focused wavelengths of light. When printing color,
 the result will be a color fringe around objects. In B&W one will see
 monochrome fringes. I have seen claims that apo is more important in B&W
 printing than in color printing, but without a rationale that made sense to
 me. Again, let's hear from someone with definitive knowledge.
 Sincerely,
 Joe Stephenson
 -----Original Messa >>