Archived posting to the Leica Users Group, 2012/11/24

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
Subject: [Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?
From: benedenia at gmail.com (Marty Deveney)
Date: Sun, 25 Nov 2012 10:37:19 +1030
References: <BLU0-SMTP101498BE1476A93A8E970D38C590@phx.gbl> <CAFfkXxtGO91jJ_FhqmdNoGOxrmPPpVxqUJiUf0Xqoij4fFhpWQ@mail.gmail.com> <CA0B5E6A-AD00-4B28-925F-8FD3182EAA72@mac.com> <CABmfTOUOykVV7UJyZA7hbuBk+VAKVJhE388dfmKVcos9PNEinA@mail.gmail.com> <ACE934EC4ABC4AEDB277DB5230A79BB8@Equibox> <3390316F-5ECE-4F38-840B-B4C27B5BED0C@usjet.net> <05dd01cdca9f$841cc060$8c564120$@verizon.net>
 
> There is no scientific definition, AFAIK.

The scientific definition is that an apochromatic lens brings 3
wavelengths to a common focal plane, an achromat brings 2.  But as you
point out there is no agreement on the source mix, what those 3
wavelengths are etc etc.

In practice, it usually means "a better lens".  The Apo-El-Nikkors are
really apochromatic across a broad range from near ultraviolet to near
infrared.

Marty
In reply to: Message from vick.ko at sympatico.ca (Vick Ko) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)
Message from sonc.hegr at gmail.com (Sonny Carter) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)
Message from imagist3 at mac.com (George Lottermoser) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)
Message from benedenia at gmail.com (Marty Deveney) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)
Message from jon.streeter at cox.net (Jon Streeter) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)
Message from robertmeier at usjet.net (Robert Meier) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)
Message from red735i at verizon.net (Frank Filippone) ([Leica] So, wouldn't a 50mm Summicron LTM or 35mm f2 ASPH LTM be the best enlarging lens on earth?)