Archived posting to the Leica Users Group, 2010/12/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Mark, Thanks for looking. Infinity focus was one of the reasons for my experimenting with the lens this morning. By itself, my Pentax bellows will not reach the 8 inches required from the sensor to the lens optical center. I am fabricating a 0.75-inch "lens board" to get a little more reach. I achieved infinity focus, with enough margin to focus down to around ten feet. I will see what I get with final assembly, but it should be enough to make it useful. Jim Nichols Tullahoma, TN USA ----- Original Message ----- From: "Mark Pope" <mark at whitedogs.co.uk> To: "Leica Users Group" <lug at leica-users.org> Sent: Friday, December 24, 2010 12:30 AM Subject: Re: [Leica] Looking Through a Lens from the Past > What an interesting experiment. > Like everyone else I'm pleasantly surprised by the sharpness and contrast > of the lens. Likewise, I was surprised that you got infinity focus - then > I re-read the post and saw it was bellows mounted, so quite easy with 8 > inches of extension! > > > > > Mark Pope, > Swindon, Wilts > UK > > Homepage http://www.monomagic.co.uk > Blog http://www.monomagic.co.uk/blog > Picture a week (2010) > http://www.monomagic.co.uk/index.php?gallery=paw/2010 > Picture a week (2009) > http://www.monomagic.co.uk/index.php?gallery=paw/2009 > (2008) > http://www.monomagic.co.uk/index.php?gallery=paw/2008 > > On 23/12/2010 18:57, Jim Nichols wrote: >> As I get older, I find I am more interested in things from the past. >> Among the gadgets that I have squirreled away is a landscape lens for a >> dry plate camera, manufactured around 1890. The lens is a Ross London >> No. 6 Symmetrical 8-inch focal length, to cover 5x7 inches, and it is >> equipped with rotary Waterhouse stops from f/16 to f/64. >> >> I am in the process of fitting the lens to a M42-mount lens board to >> permit its use on a Pentax bellows unit attached to my Olympus E-1 DSLR. >> For a dry run, to be sure that I had the dimensions correct, I assembled >> the parts in a temporary manner to take a few test shots. All shots were >> hand-held; I'm sure that the use of a tripod would improve things. >> >> The lens itself. A similar lens is shown under Ross on the >> Camerapedia.org website: >> >> http://gallery.leica-users.org/v/OldNick/Ross+Lens+2.jpg.html >> >> A black and white image to look at sharpness and contrast: >> >> http://gallery.leica-users.org/v/OldNick/Michelin+bw.jpg.html >> >> 1890 meets 2010; a contrail with a faint view of the passing jet: >> >> http://gallery.leica-users.org/v/OldNick/Contrail.jpg.html >> >> I will find some period subjects when I get the project completed. >> >> Jim Nichols >> Tullahoma, TN USA >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > >