----- Original Message ----- From: "Alex Zabrovsky" <[EMAIL PROTECTED]> To: "EOS list" <[EMAIL PROTECTED]> Sent: Tuesday, November 12, 2002 9:36 AM Subject: FW: EOS 70-200/2.8L against it's IS brother
........> I hope you will forgive my ignorance and stupidity, but >would you clarify > the terms parfocal and varifocal and how it implies on optical quality of > the lenses ? > Regards, > Alex Z Ignorance is often born from a non enquiring mind and stupidity we are just born with. Parfocal means that zooming does not affect the point that is focused. In other words, if focus is achieved at 200mm and the lens then zoomed to 70mm, no refocusing is necessary. Varifocal means refocusing is necessary. I don't now what efffect this has on optical performance. Just showing my ignorance :�) Craig Z * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
