Archived posting to the Leica Users Group, 1997/10/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Center filters for large format are widely available. Heliopan seems to market a wide range of sizes (49mm-95mm in ads) at considerably less expense than Schneider and Rodenstock, but I don't know about the specific sizes you mention. About compatibility with the 21mm/3.4 SA, I can't say for sure. Try contacting HP Marketing (U.S. distributor of Heliopan) or the UK distributor for information. Michael >Regarding light falloff due to cos fourth law Henning J Wulff wrote: > >>The only real fix is a graduated ND center filter, which large format >>users (and Hologon users) are quite familiar with. > > >Does anyone know of a source of graduated ND center filters suitable >for use with the 21mm/3.4 SA. Either Series VII to fit in the lens >hood or 68mm screw in. > >I'm aware of the 95mm ones manufactured by Schneider for use with their >XL series of large format lenses but I haven't seen any smaller. I'm also >told by large format users that the filter should be made to match by the >lens manufacturer. > >Due to its close focussing (40cm) and large angle of view I find the >21mm/3.4 SA to be excellent for photographing plants whilst showing their >habitat. Unfortunately many of my pictures include large expanses of what >should be a uniform deep blue sky. On chromes the darkening in the corners >is most noticeable. I'm not too concerned about exact compensation, >anything would be better than nothing. > > >Bob Parsons.