thanks, but I am pretty sure that wont work, the 18% figure is a reflectance figure, not light source. I want to do fstop vs macro magnification charts with the on camera flash to the 18% card.
JC O'Connell [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joseph McAllister Sent: Monday, December 22, 2008 7:20 PM To: Pentax-Discuss Mail List Subject: Re: need a homemade 18% gray card If your monitor is calibrated, I'm sure there is some way to have it display an 18% grey. If it's a laptop, you can always have one with you. On the other hand, you could buy one for a few bucks. I bet on eBay you could find a Kodak Pocket Reference book (used). The include an 18% grey card and a color swatch card. On Dec 22, 2008, at 16:03 , JC OConnell wrote: > I just got a macro lens today and want to do some > exposure testing with the istDS flash. I need a > gray card but dont have one. > > anybody know of a common household item that > emulates 18% gray or an easy way to make one > with the pc? I have an accurate incident/reflectance > meter so I guess I could just do a bunch of gray > shade printouts till i find the right shade but > that sounds like too much work. > > jco Joseph McAllister Lots of gear, not much time gallery.me.com/jomac web.me.com/jomac/show.me/Blog/Blog.html -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
