And who says they don't????? i.e. Isnt the DA 14mm F2.8 lens smaller and lighter ( and cheaper ) than any FF 14mm F2.8 lens on the market?
JCO -----Original Message----- From: William Robb [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 27, 2004 4:23 PM To: [EMAIL PROTECTED] Subject: Re: M42 ultra-wide ----- Original Message ----- From: "J. C. O'Connell" Subject: RE: M42 ultra-wide > Fart theories? Are you that ignorant of basic lens design? For the > same level of quality and same speed and focal length, a FF lens which > has an image circle diameter 150% of an APS lens will always require a > higher level of correction due to the much wider field. That > translates into larger size, weight, cost, etc. You don't need "on the > shelf" items to know that simple fact of optical life..... I just have to wonder why on the shelf items don't seem to match what you are saying about optical theory? Except the part about cost. William Robb
