I do landscape photography and I am considering a 300 mm lens for my Linhof Mast er Tech. which has a 400 mm bellows extension. I previously owned a brand new Ni kon M 300mm but was very unhappy with its performance an experience which I am n ot about to repeat. I am considering the Rodenstock Apo Ronar and the Schneider G-Claron, both f9. These lenses are light enough for back-packing unlike the ve ry large and heavy Sironar or even larger and heavier Symmar lenses. The G Clar on has the problem that at infinity, the lens imaging quality is extremely poor at openings below f22. (MTF) The Apo Ronar, again acccording to MTF appears opt ically greatly superior to the G Claron at all distances and f stops but I am co ncerned that since this is a single coated lens and there are a great many more air-glass interfaces, the Apo-Ronar will be succeptible to flare, more so than t he G-Claron. For landscapes this would be a major defficiency. 1) Has any one made a comparison of these two lenses in backlit scenes outdoors? 2) Other than these two lenses are there any other better options among lighter weight lenses perhaps with larger max. openings? 3) David Muench uses a 300mm lens (among others, see one of his latest books, "P lateu Light") and frankly anything he uses should be good enough for me. Because DM must backpack a great deal I doubt that any 300 mm lens in his bag could be a Sironar or Symmar. Does anyone know what lens it is that DM uses? 4) Has anyone used 360 mm lenses on a Linhof MT? I understand that to get the ex tra flage-film distance the lenses can be mounted on reversed wide-angle Linhof boards. Is is practical? Your response would be greatly appreciated.