Correct. It can be larger but not smaller. Kent Gittings -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Frank Wajer Sent: Friday, November 09, 2001 11:43 AM To: pdml Subject: Re: 200 f2.5 question, how can filter ring be 77mm?
> Lets not forget in this discussion of the maximum f/stop of a > lens that the f/stop measurement is taken from the relationship > of the entrance pupil and the focal length. The actual diameter > of the front element is not part of the equation. The entrance pupil is always smaller or equal to the largest lens in the system, so there is still a problem. Frank > William Robb - 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 .
