Re: 100 mm f/2.8 F Macro - 100 mm f2.8 FA Macro
Peter, The optical formula and mechanics are different. I don't have the FA or F, but I believe both use internal focus mechanisms. Theses lenses don't change length as you focus. I am not sure if there is much difference in image quality. I'd be interested in any comparisons. Regards, Bob S. On Sun, 14 Nov 2004 18:07:18 +0100, Peter Smekal [EMAIL PROTECTED] wrote: Are there any differences between 100 mm f/2.8 F Macro and 100 mm f2.8 FA Macro, let's say in optics or mechanics? Peter, Sweden
RE: 100 mm f/2.8 F Macro - 100 mm f2.8 FA Macro
Bob, I'm afraid both lenses are not IF... I have the FA100/2.8 and the front bit does stick out when I focus. Andy -Original Message- From: Bob Sullivan [mailto:[EMAIL PROTECTED] Sent: Monday, November 15, 2004 1:21 AM To: [EMAIL PROTECTED] Subject: Re: 100 mm f/2.8 F Macro - 100 mm f2.8 FA Macro Peter, The optical formula and mechanics are different. I don't have the FA or F, but I believe both use internal focus mechanisms. Theses lenses don't change length as you focus. I am not sure if there is much difference in image quality. I'd be interested in any comparisons. Regards, Bob S. On Sun, 14 Nov 2004 18:07:18 +0100, Peter Smekal [EMAIL PROTECTED] wrote: Are there any differences between 100 mm f/2.8 F Macro and 100 mm f2.8 FA Macro, let's say in optics or mechanics? Peter, Sweden
Re: 100 mm f/2.8 F Macro - 100 mm f2.8 FA Macro
Mechanically they seem to be very different, however Boz's site has the same optical diagram for both http://www.bdimitrov.de/kmp/lenses/primes/short-tele/F100f2.8-Macro.html http://www.bdimitrov.de/kmp/lenses/primes/short-tele/FA100f2.8-Macro.html Peter Smekal wrote: Are there any differences between 100 mm f/2.8 F Macro and 100 mm f2.8 FA Macro, let's say in optics or mechanics? Peter, Sweden -- I can understand why mankind hasn't given up war. During a war you get to drive tanks through the sides of buildings and shoot foreigners - two things that are usually frowned on during peacetime. --P.J. O'Rourke
Re: 100 mm f/2.8 F Macro - 100 mm f2.8 FA Macro
Actually both have identical optics, and they are not IF (the Canon is). One advantage of the FA is better manual focus ring as the F has a very narrow one. The new D-FA which is much lighter and smaller, is just around the corner so it might be a good idea to wait. I suspect the new one has the same optics but with triple plastic barrel instead of double metal on the F/FA. Alan Chan http://www.pbase.com/wlachan The optical formula and mechanics are different. I don't have the FA or F, but I believe both use internal focus mechanisms. Theses lenses don't change length as you focus. I am not sure if there is much difference in image quality. I'd be interested in any comparisons.
Re: 100 mm f/2.8 F Macro - 100 mm f2.8 FA Macro
On Nov 15, 2004, at 6:32 AM, Andy Chang wrote: Bob, I'm afraid both lenses are not IF... I'm not sure about the F version but the FA has FREE (a fixed rear element). Not quite IF but maybe halfway there. I have the FA100/2.8 and the front bit does stick out when I focus. Yes, it sticks out a lot :) Cheers, - Dave (loves his macro lens) http://www.digistar.com/~dmann/
