Luis, I think that you can't compare the Grandagon line with the Sironar line. The Grandagon line is a line of wide angle lenses and as such they have a much wider coverage from start.. (for those not accustomed to LF, yes, the 200mm can be a wideangle if you use it with a 8x10 inch format). The Sironar are a line of normal lenses, offering different coverage in order to cope with the different formats (offering a focal length equal to the diagonal of the format). I've digged in my archives where I found explanations for the Rodenstock lenses, I got the leaflets back in 2000; they described the N and S series, but I didn't find any mention of a W series. The S series has a larger coverage than the N series; Rodenstock adds that the N series is an all around lens and that the S series is also an all around lens, but that it shines in reproduction works, because it is able to restitute very fine details even at the edge. In the Grandagon line, there was a Grandagon series and a Grandagon N series. The Grandagon series have smaller focal lengths than the N series and Rodenstock doesn't explain why they are named differently. I don't see any W series, neither in the Grandagon line, nor in the Sironar line. I've just visited their German www site and there is still no mention of the W series, but from there one can download specifications sheets for each series of lenses. May be that the W series is specific to the US market ? http://www.rodenstockoptics.de/rodenstockoptics/index.htm or may be that their site hasn't been updated, who knows.. Christiane Le 14.9.2002 12:59, « *-CHILLED DELIRIUM-* » <sfunp@scfn.thpl.lib.fl.us> a écrit : > > > On Sat, 14 Sep 2002, Christiane Roh wrote: > >> Welcome to the list ! I've Schneider lenses so I don't know the right >> answer to your question, but LF lenses are discriminated by their coverage >> (the width of the image they are able to project on the groundglass), which >> can vary for the same focal length. I suspect that N could be for Normal, W >> for Wide and S for Superwide coverage. > > I looked into this idea, and here is what I found: > > (All Rodenstock) > > Lens Angle of coverage Image Circle (@f/22) > _________________________ __________________ __________________ > > Grandagon N 200mm f/5.6 102 deg 495mm > > APO Sironar N 210mm f/5.6 72 301 > > APO Sironar S 210mm f/5.6 75 316 > > APO Sironar W 210mm f/5.6 80 352 > ______________________________________________________________________ > > Rodenstock refers to the Grandagon N series as having "super wide > angle of, coverage". > > They describe the APO Sironars as "an all around lens" (?). > > APO Sironar S: " Like the APO Sironar N, its applications are > practically limitless. The angle of view has been increased to > 75 deg to permit more shift, which permits applications that require > large parallel shifts to correct the perspective optical design." > > The Sironar W: "..can also be used as a wide angle." > > And from all that, it seems like the "W", "S" and "N" do not > define angle of coverage or image circle. The two Ns have very > different coverages and image circles. One of the Ns (Grandagon) > has the largest angle of coverage and image circle, and the W falls > somewhere in between. > > --- Luis >
