samirmainali Posted August 1, 2008 Share Posted August 1, 2008 Is it possible to make one greycard at home or replace it i know about palm reading, i m looking ideas other than that Link to comment Share on other sites More sharing options...
ronald_moravec1 Posted August 1, 2008 Share Posted August 1, 2008 It is cheaper to buy a grey card that you know is right. Link to comment Share on other sites More sharing options...
Craig_Cooper11664875449 Posted August 1, 2008 Share Posted August 1, 2008 Asphalt... Link to comment Share on other sites More sharing options...
bobatkins Posted August 1, 2008 Share Posted August 1, 2008 You can always meter a white card and open up by the appropriate amount (which is around 2.5 stops if you're looking for an 18% grey card exposure). Link to comment Share on other sites More sharing options...
charles_stobbs3 Posted August 1, 2008 Share Posted August 1, 2008 Clasified ad page from a newspaper. Link to comment Share on other sites More sharing options...
James G. Dainis Posted August 1, 2008 Share Posted August 1, 2008 Clear northern sky. James G. Dainis Link to comment Share on other sites More sharing options...
vincent_peri Posted August 1, 2008 Share Posted August 1, 2008 Are you shooting with a digital camera or a film camera? Don't quote me, but I've read from what I think is a reliable source that digital meters are based on 12% reflectance, while film camera meters read 18% reflectance. Kodak makes 18% gray cards. Here is one source for digital gray cards: http://www.rmimaging.com/products/graycard_index.html There are other cards, but since I don't shoot digital, I haven't done much research as to which is best. Link to comment Share on other sites More sharing options...
clay2 Posted August 1, 2008 Share Posted August 1, 2008 I mostly just meter off of the green grass. As far as I know common calibrations are as follows 12% reflectance - American ANSI standard, Sekonic, Nikon DSLR's, Kodak grey card used according to instructions that come with it. 12.5% - a Japanese standard similar to ANSI. 14% Pentax and Minolta hand held meters 18% - Kodak grey card not used according to Kodak instructions and recent Nikon AF SLR's. 12% to 18% is half a stop. Manufacturing tolerances can be 2% of reflected light either way. Differences of 0.66 stops between some meters is unavoidable. /Clay Link to comment Share on other sites More sharing options...
ifti Posted August 1, 2008 Share Posted August 1, 2008 I don't have it but used it at a workshop called Lastolite it is <50$ is available at B&H and Adorama. Was impressed with it. Link to comment Share on other sites More sharing options...
atlatling Posted August 1, 2008 Share Posted August 1, 2008 Back 15 or so years ago, I had a paint store sell me a gallon of flat wall paint just the right color according to their computer. I painted several boards some up to two by three feet and others quite small. I must have 9 tenths of the can still sitting around somewhere -- unless during the recent cleaning of my basement while I was away, it was tossed. You don't need to get that much paint. A quart will do you for years and years. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted August 1, 2008 Share Posted August 1, 2008 The usage of a "grey card" can be for several reasons. <BR><BR>ONE is just neutral object for a color printer to force an image to be closer to neutral. It can be the the reference object or card thats used to force "neutral calibration" with a Phase One scan back. In these two cases one wants a neutral grey object; the percentage reflectance is not so important. <BR><BR>The second reason a grey card is used is for exposure. Grey cards came out beforen WW2; before the asa speed system of WW2 even. Folks new to photography think that exposure meters and film speed systems magically came out one day; with no evolution. :); they forget about tungsten bulbs, the Kodak speed system, the Weston film speed system The reason cards are often 18 percent is its 5 times a the standard 90 percent side; ie the white side of graphics arts card used in early process camera work. The white card allows the early meter to move off of zero :) and thus one gets a starting point with asa 3 to 6 films. The reason its an integer; ie say "5" is one is exposing your process cameras negatives and blowbacks in seconds of exposure. A meter that read 4 seconds with the white card means 20 seconds as the trial exposure; ie the grey side. Think pre ww2 in a darkroom' with a crude meter that has a super low sensitivity. Today many folks think the 18 % number is some deeply thought out number; the reflectance of Britneys face; the reflectance of a 1961 Plymouths JATO taillight pods; the percentage of peek a boo hair of a todays teenager or Veronica Lake. .<BR><BR>The nikon school in 1969 had one using your palm and adjusting a stop. I think it was John Slack who mentioned this. Link to comment Share on other sites More sharing options...
samirmainali Posted August 3, 2008 Author Share Posted August 3, 2008 great informaton here and nice discussion thanks guys Link to comment Share on other sites More sharing options...
alan_rockwood Posted August 29, 2008 Share Posted August 29, 2008 "Veronica Lake" Kelly, you must be an old-timer to recall that name. She made some films with Alan Ladd, who I was kinda, sorta named after. Link to comment Share on other sites More sharing options...
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