Hi Brigitte, Further in Jim Moninger's article he mentioned that he saw the banding using .5mm slits and so increased the slit width to 2mm thus making more diffuse images with less banding. I can't see banding in the images that accompany his article.
The use or elimination of banding is up to the photographer. Marnie Cardozo's images in the same issue of PJ are much sharper, but include banding. I've dedided to keep the banding in the iconoclast images. Tom ----- Original Message ----- From: <brigitte.har...@london.glencore.com> To: <pinhole-discussion@p at ???????> Sent: Wednesday, November 07, 2001 7:44 AM Subject: Re: [pinhole-discussion] slit cameras? > > Thanks guys. > But what does it mean in pratical terms of constructing or pairing > differently shaped slits. Is there anything I can do or avoid to do in > order to eliminate or diffuse the problem? > Regards, > Brigitte. > > > > "Guillermo" > <pen...@home.com> To: <pinhole-discussion@p at ???????> > Sent by: cc: > pinhole-discussion-admin@p Subject: Re: [pinhole-discussion] slit cameras? > inhole.com > > > 07/11/2001 13:08 > Please respond to > pinhole-discussion > > > > > > > > ----- Original Message ----- > From: "Tom Miller" <twmil...@mr.net> > > > > Also, do you have any explanation why in some slit configurations > > > there is a lot of banding (thin black lines) forming over the image? > > > > This quote is from Jim Moninger's article in the Pinhole Journal vol. > > 15 #1 : "These are apparently caused by the light rays / waves with > > form the two separate images becoming out of phase with one another." > > Tom > > Not just out of phase but 180 degrees from each other. This -perhaps- are > regions where light (wave) diffracted by one slit is at its maximum peak > (+) > and light (wave) diffracted by the other slit not just overlaps the former > but happens to be at its lowest peak (-), the net effect is darkness, light > from one slit canceling out with light from the other slit, weird, eh? > This > BTW, is called Destructive Interference. > > Guillermo > > > _______________________________________________ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ > > > > > > > STRICTLY CONFIDENTIAL. The contents of this email and any attachments are strictly confidential and they may not be used or disclosed by someone who is not a named recipient. > If you have received this email in error please notify the sender by replying to this email inserting the word "misdirected" as the message. > > _______________________________________________ > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/
