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.
--
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers (replace 'nospam' with 'kennedym' when replying)
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