I think that the lens designers really wet their pants when multicoating
became a reality because they were able to build zooms with more
elements and still increase contrast over single coated zoom lens
designs.
-Gene
Clive Warren wrote:
>
> At 10:19 pm +0000 18/2/98, Kennedy wrote:
>
> >In article , Clive Warren <Clive.Warren@xxxxxxxxxxxxx> writes
> >>At 11:59 pm +0000 17/2/98, Kennedy wrote:
> >>
> >>>
> >>>In article , PCACala@xxxxxxx writes
> >>>>
> >>>>Hum, a 3 0ncrease in transmittance. Reminds me of the marginal
> >>>>performance
> >>>>increase from a 200 to 233 MHz Pentium.
> >>>>
> >>>Its not the 3 0ncrease in transmission that makes the difference, but
> >>>the more than 75% relative reduction in reflection.
> >>
> >>
> >>If you like taking shots with the sun or a bright light source in your
> >>photos. Where did the 75 0.000000igure come from anyway?
> >
> >>From your own figures, actually, Clive! :-)
> >
> >You quoted 95% Tx for single coating and 98% Tx for multicoating.
> >Assuming that the optical glass absorbs 1% (a conservative estimate),
> >this means that the single coating reflects 4%, and the multicoating
> >reflects 1%, giving a 75% *relative* reduction in reflection over the
> >single coated part. If the glass absorbs more than 1%, then the
> >relative reduction is even greater.
> >
> >You don't actually need a bright light source in your image to see the
> >difference - veiling glare is the bane of all 'contra-jour' or backlit
> >work.
>
> Yo Kennedy I own up - you know that 750f almost nothing is still almost
> nothing though ;-) See that's the trouble with statistics and how they
> sold Super MC to the general public.......
>
> Take your point about 'contra-jour' or backlit work - have had some really
> crazy spaceship like flare from a Zuiko 35-135 and equally scary from a
> 50mm f1.8 MC from fire sculpture work. Ironically it was some of the
> excessive flare photos that people really liked :-)
>
> All the best,
>
> Clive http://clive.bel-epa.com
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