That's called spherical aberration or coma I think. Unless the aperture diaphragm is not circular at whatever F-stop you chose. Kent Gittings
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ed Mathews Sent: Saturday, January 05, 2002 5:26 PM To: [EMAIL PROTECTED] Subject: 77 specular bokeh talk (again!) Just when you thought it was safe to go back in the water..... A week or so ago there was some limited <g> discussion about the Nikon 105, it's bokeh, and the 77 bokeh. I mentioned that the 77 yields nice bokeh, with some football (American football) shaped highlights. Nobody commented about that, and probably nobody understood what I meant. So I thought I'd take a picture of my Christmas tree lights out of focus to show you. This is background bokeh, with the brightest lights about 7 feet away, and the lens focused to about 3 feet. In this shot, the lens is at F2.8. In other shots I took at smaller apertures, the highlights of course get smaller, and the football shapes start to get more round. It appears to me that the shape becomes more oblong closer to the edge, and that they kind of look like they circle around the center axis. Tell me what you think. http://lightandsilver.com/Temp/77.htm Thanks, Ed http://lightandsilver.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
