Bob W wrote: >>-----Original Message----- >>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>Behalf Of Mark Roberts >>Sent: 25 March 2007 15:13 >>To: Pentax-Discuss Mail List >>Subject: Re: Pinhole photography conference (was: Zero Image) >> >>Mat Maessen wrote: >> >> >>http://www.matoe.org/gallery2/v/tomatoe/pinhole/IMGP0119K10D.jpg.html >> >>>Pinhole photography with a K10D. I drilled a hole into a Pentax > > body > >>>cap. Then I cut a piece of a soda can, made a pinhole in it, > > painted > >>>it black, and taped it onto the cap with electrical tape. >>>Exposure was about half a second at ISO 100 in full sunlight. >> >>Wow. I'm going to have to try that! >> > > > earlier today I made a hole in a body cap and took some pictures. The > first in each pair is the scene through a lens. The 2nd is the scene > through the pinhole: > > http://www.web-options.com/Pinhole/ > > Interestingly the pinhole seems to have a focal length of about 50mm. > The f-stop, according to my calculation, is about 128, based on the > difference in exposure times at ISO 100.
Making pinholes directly in the bodycap? Better to make a bigger hole and cover it with some thin metal with the actual pinhole in. The smoother you make the hole, the fewer artefacts. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
