Auteur: richaud philippe
Date: 29-07-2009 21:34
je l'ai remplaçé par un......apo sironar N de 210mm.
Par contre, par la suite j'ai trouvé des infos sur :
http://www.thalmann.com/largeformat/mid-rang.htm
180 mm: With the standard f5.6 plasmats (APO Symmar, APO Sironar-N, APO Sironar-S, Nikkor W, Fujinon CM-W, etc.) starting to get fairly large in this focal length, there is really only one 180mm lens I can think of that meets my standards of compact and lightweight. That lens is the:
180mm f9 Fujinon A: Like the 150mm G Claron, the Fuji A is an f9 process lens. Also, like the 150mm G Claron, it is a very light (190g) and compact (46mm filters) lens that is favored for field use (See Figure 3. below). Fuji lists the coverage as 70 degrees for a 252mm image circle, plenty for 4x5 landscape photography. This lens was produced throughout the 1970s, 80s and 90s. Early samples, were single coated. Later production models were manufactured with Fuji's excellent EBC multi-coating process. The one sample we tested (an early multi-coated sample from the late 1970s or early 1980s) had outstanding sharpness in the center of the field, but tailed off near the corners (See Table 5.). Still at f16 and f22, it's a decent performer. Newer samples may perform a little better. Unfortunately, Fuji discontinued the last remaining members of the A series (the 180mm and 240mm) during mid-1998, so they are no longer available new. They do show up on the used market, and if you're looking for one, I'd recommend one of the latter production EBC multi-coated samples in the modern all black Copal shutters.
Table 5. 180mm Fujinon A Test Results
(What do these Numbers Mean?)
180mm
f/9 Fujinon A f/11: 67 76 34
f/16: 67 67 42
f/22: 60 60 38 190g Copal 0 282xxx 1980s
Voila, vous savez tout.
Philippe.
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