-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Henry Posner Sent: Wednesday, March 19, 2003 11:18 AM To: [EMAIL PROTECTED] Subject: EOS Re: Extenders again
At 01:51 PM 3/19/2003 +0100, you wrote: >I currently have a 100-400L and a Canon 2x extender and was wondering if it >was only canon extenders that you lost auto focus on, or all lenses slower >than 2.8 regardless of the extender used. The 100~400 is f/4.5-5.6. With a 2x teleconverter you have, effectively a 200~800 f/8-11. The EOS 3 AF functions at an effective max aperture of f/8, but only the center AF point does. As far as I can recall all other AF bodies lose reliable AF if the effective max aperture is below f/5.6. -- - regards, Henry Posner B&H Photo-Video, and Pro-Audio Inc. Hi HP, The EOS 1V based bodies will also retain AF operation down to f/8 using the central AF point too. But when used at f/8 the central AF point is only a horizontal sensor not the high precision cross type. Cheers/Chip * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
