I dont think that the statement that the "effective" focal length in macro shooting is ALWAYS less than the nominal focal length at infinity is even remotely close to being true for all macro lenses. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joseph Tainter Sent: Saturday, December 09, 2006 11:35 PM To: [email protected] Subject: SR effectiveness at 1:1 macro? Given this knowledge I can dial in the effective FL on my manual lenses so that SR is optimized when I'm working at or close to 1:1. My question is does the SR system compensate for FL change when using later lenses where manual input of the FL is not available? ----- Very good question, Rob. I have two reactions: Firstly, I think this is a question for Ned Bunnell. He should be able to get us the answer. Secondly, your calculations show that effective focal length in macro shooting is always less than nominal focal length at infinity. I wonder if it matters for SR? This photo with the FA* 200 F4 Macro was not at 1:1, but I was pretty close to the bud (maybe about 1 m. or so) and shot at 1/60th handheld, with SR on. http://www.fotocommunity.com/pc/pc/mypics/535671/display/7358516 Joe -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
