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..... JCO
-----Original Message----- From: William Robb [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 27, 2004 11:00 AM To: [EMAIL PROTECTED] Subject: Re: M42 ultra-wide ----- Original Message ----- From: "J. C. O'Connell" Subject: RE: M42 ultra-wide > It is going to be more than you suggest, see my last post. You werent > comparing KA lenses of same focal length and speed in your > comparison. the Nikon has a different > flange distance, not sure which way, > and a hate to ask but HOW MUCH for > a Nikon 14mm F2.8 lens? I have a feeling > it's a lot more than $699 huh? I mentioned the extra cost in a previous post, and I am making comparisons between what is available, as I would rather not just fart theories out my ass, 14mm is about as close as you can get to 15mm so it's a fairly safe comparison, and there is no direct comparison aperture to aperture available. I don't know how much of a size difference 2/3 stop will allow at this focal length. I suspect not much, since it is the flange to focal plane distance and the resulting extreme retrogocal design causing the large size more than the aperture. Also, as I specifically mentioned, for myself, (YMMV) an APS sensor sized lens isn't much interest to me (and the original poster wasn't too sure about it either either). William Robb
