I was asking a serious question - in terms of distortions, the same amount of light is passing thru glass, if my understanding is correct. Does the cross sectional area make a difference?
> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Thursday, November 29, 2001 10:08 PM > To: [EMAIL PROTECTED] > Subject: Re: Optics was RE: EOS UD Glass Question > > > > On Thu, 29 Nov 2001 21:53:44 -0800 "Icoz, Evrim" > <[EMAIL PROTECTED]> > writes: > > > OTOH, the UD glass put into the cheap third-party lenses > are used in > much > > > smaller elements, and usually put in there for > advertising purposes. > Take a > > > look at the Nikon 70-300 ED (which allegedly is a Tamron > design). The > ED > > > element is tiny. > > > > Just curious - since all the light goes thru both the large lens and > also > > the smaller lens, does it matter which one is UD as long as > one of them > is? > > Somebody who has better optics than I do? > > It does make a difference........ much like driving instructions - it > matters a lot the order that you make your left and right turns! > > Dave Herzstein > [EMAIL PROTECTED] > http://www.kjsl.com/~dave > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
