jimdesu Posted May 27, 2003 Share Posted May 27, 2003 Hi there, I know this's insane, but does anyone know of a lens that'll cover 20x30 at infinity? If my math's right, that's an image circle of 916mm w/ no movements! I'm also wondering if I should just buy a single achromat cell, and, if that sort of thing works, if there are any rules of thumb for figuring out how to predict what the image circle of such a thing would be. Good idea? Bad idea? Dumb idea? =) thanks, Jim Link to comment Share on other sites More sharing options...
armin_seeholzer Posted May 27, 2003 Share Posted May 27, 2003 Apo Ronar 1200mm should cover it! But you need about 1,20m Bellows! Link to comment Share on other sites More sharing options...
jim_galli4 Posted May 27, 2003 Share Posted May 27, 2003 There was an article a few issues back in View Camera Mag about a guy that was doing that size on Polaroid products. That's the guy to talk to. Then I think Wisner has a page with lenses that will cover <a href="http://www.wisner.com/20x24lens.htm">20X24</a>. Link to comment Share on other sites More sharing options...
tim_atherton2 Posted May 27, 2003 Share Posted May 27, 2003 Various of the old Cooke lenses? Series VA, VB IX 30", 36" , 42", 48" etc? http://www.cookeoptics.com/credits/may-june%20view%20camera.html Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted May 27, 2003 Share Posted May 27, 2003 The APO ronars are not that wide of coverage...Our longest is a 36"/890mm which covers 24x36" at close ratios; but I'm not sure at infintiy......at 3x; the 24x36" negative would shoot an 72x108" field; taller than my vertical glass we place originals on........Maybe cutting a hole in the wall will give me the infinity coverage....:)<<BR><BR><img src="http://www.photo.net/photodb/image-display?photo_id=1238404&size=md"> Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted May 28, 2003 Share Posted May 28, 2003 Armin ; our camera above has 7.6 feet of bellows; about 2.3 metres. the rails are about 17 feet long; 5.2 metres....To big to move; so it sits in one place! The negative, ground glass; and vacuum back is in another room; the camera is built into the wall...Maybe I should build a ULF portable camera; for my lenses.... Link to comment Share on other sites More sharing options...
c_p_goerz Posted May 28, 2003 Share Posted May 28, 2003 35 or 42" Artar, 24" Dagor. CP Goerz. Link to comment Share on other sites More sharing options...
john_gerndt1 Posted May 28, 2003 Share Posted May 28, 2003 There is always the pinhole. You have film that is 30 inches? There is also a group (astronomy?) that grinds its own lenses on the net. They have shown up in my searches under Aplanat. At this scale you needn't worry about 1 micron precession in alignment. Maybe there is someone in the group that you could commission? I'd mimic an f 18 Protar V myself. Without going to these lengths you are stuck with searching for hens teeth or with luck, find a 900mm - 1200mm process lens. If you are thinking this big you must be a patient man. Good luck. John Link to comment Share on other sites More sharing options...
armin_seeholzer Posted May 29, 2003 Share Posted May 29, 2003 Hi Kelly realy a nice monster are you making repros with it or what?And for James ask isak bush he had the largest cam I ever have seen. With a google search maybe you can find him with hes monsters!Goo luck! Link to comment Share on other sites More sharing options...
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