 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| PhotoKB HomeDiscussion Groups Digital Photography Digital PhotoDSLR CamerasZLR CamerasPoint & Shoot CamerasFilm Photography 35 mmLarge FormatMedium formatDarkroomFilm and LabsOther EquipmentPhoto Technique Nature PhotographyPeople PhotographyTechnique GeneralGeneral Photo Topics General TopicsAustralian PhotographyUK PhotographyDirectoryPhoto Clubs |
Photo Forum / Film Photography / Darkroom / July 2004heliographs- how did they copy them
pardon my poor keyboarding; my keyboard took a bath through an open window... i was reading a book and wondering how heliographs were copied for books that we see today.. sorry i can't use punctuation111 ha Cheers, -sd http://www.zoom.sh > pardon my poor keyboarding; my keyboard took a bath through an open > window... [quoted text clipped - 3 lines] > > sorry i can't use punctuation111 Assuming you're referring to early forms of photography on opaque media, most likely they were rephotographed. This was occasionally done with Daguerreotypes to make copies, with (of course) a small amount of loss with each generation, as with any analog process.  SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. >> pardon my poor keyboarding; my keyboard took a bath through an open >> window... [quoted text clipped - 8 lines] > Daguerreotypes to make copies, with (of course) a small amount of loss > with each generation, as with any analog process. Surely true, but the "grain size" of a Daguerreotype is extremely small, so I would assume the problems would be due mainly to focusing errors and deficiencies of lens performance. Signature.~. Jean-David Beyer Registered Linux User 85642. /V\ Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 03:20:00 up 4 days, 16:15, 3 users, load average: 4.20, 4.16, 4.11 This is what I'm thinking. They are shiny metal plates and I cannot see how it could be accurately reproduced. >>> pardon my poor keyboarding; my keyboard took a bath through an open >>> window... [quoted text clipped - 12 lines] >so I would assume the problems would be due mainly to focusing errors and >deficiencies of lens performance. Cheers, -sd http://www.zoom.sh > This is what I'm thinking. They are shiny metal plates and I cannot > see how it could be accurately reproduced. I think if you made a same-size photographic negative, and contact printed that, you could come close enough to reproduce the sharpness and dynamic range to fool the human eye. You might have trouble with the color and the curious nature of the fact that the shiny silver of the image is seen as black, and the silver amalgam is seen as white. Where the trouble is most severe is if you make extreme enlargements: there is still no noticeable "grain" in a Daguerreotype, since there is no "emulsion" of silver halide grains in gelatine. So the grain is more nearly on the molecular level instead of (the space between) the silver halide grains in conventional emulsions. >>>>pardon my poor keyboarding; my keyboard took a bath through an open >>>>window... [quoted text clipped - 16 lines] > -sd > http://www.zoom.sh Signature.~. Jean-David Beyer Registered Linux User 85642. /V\ Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 16:55:00 up 5 days, 5:50, 7 users, load average: 4.29, 4.19, 4.11 >>> pardon my poor keyboarding; my keyboard took a bath through an open >>> window... [quoted text clipped - 12 lines] > so I would assume the problems would be due mainly to focusing errors > and deficiencies of lens performance. Well, and framing issues -- the only Daguerreotype rephotograph I've seen is framed to include the entire case of the original in the image of the copy, which I'd guess was due to limited focus extension on the camera used to make the copy -- that is, the photographer couldn't manage a 1:1 macro (in around 1840), so had to settle for making the copy as large as possible. SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.