Re: submission to IR Digest

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 30 Aug 96 at 1:11, JoePaduano@xxxxxxx wrote:

> David--I see you received many responses concerning the Cokin filters. My
> mention of them was in response to a question about ektachrome color
> infrared. Again the best results obtained for color infrared with the Cokin
> filters was with the varicolor or polacolor filters in conjunction with a
> separate linear polarizer. 

Are you sure about the second *linear* polarizer? If you put the
ordinary pol last in line (the way the Cokin system works), there
shouldn't be a difference IMO. The retarder/quarter wave plate (what
makes it a circular pol) is on the back of the pol, so it shouldn't
influence the 'interaction' between mono/vario pol and ordinary pol.


> Any combo will produce a variety of colors that
> work wonderfully. i.e.-varicolor purple/orange, red/green, etc. As the linear
> polarizer is rotated, the varicolor filter will change colors as the light is
> polarized at varying angles. Another alternative is to use colored polarizing
> filters. Give them a try.

I definately want to give those magic filters a try in future.
Did you know that Hoya also makes mono and vario pol's?
Four mono's: Orange, Red, Yellow and Blue (in the past also Purple 
and Green)
Five vario's: Red/Blue, Yellow/Green, Yellow/Red, Red/Blue and Red/Green.

FWIW: Cokin has three mono's (lacks the Orange), and four  
vario's: Red/Green, Red/Blue, Purple/Orange, Blue/Yellow.

Seems fun stuff to experiment with on IE, but I guess predictability 
goes down the drain in notime....8-))

--
Bye,

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The difference 
between men and boys
is the price of their toys

<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 18