Re: Filters!?!?

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 10:14 am +0100 21/2/00, Eckhard Stephan wrote:

>>Are the differences significant? Cause what I really want is to explore
>>that absence >of depth of field that I see in some IR photos.
>>
>>Best regards,
>>PedroL
>
>Hello Pedro,
>
>the differences between a Wratten #25 or #29 (dark red filters, which
>are also used for normal bw photography) and visually opaque "IR"
>filters such as the Wratten #87 or #87C are visible, but not too strong.
>With a Wratten #25, Kodak HIE as well as Konica IR will exhibit all the
>characteristic traits of IR films like white trees, dark skies,... With
>a #87 these effects will still increase, besides that contrast will in
>general get higher. But these are rather minor differences... So there's
>no need to buy an expensive (and not readily available) opaque IR filter
>right now.

Snippety snip

Have a look at the example images in a variety of books - for example the
Laurie White book - there are indeed noticeable differences when using
different filters.

Kodak HIE works well with all the filters mentioned.

Konica 750 IR film is not really usable with 87 and 87C filters as the film
is sensitive to so little of the light allowed through by the filters. The
ideal filter is an 89B for the "true" infrared effect - a red 25 works well
also.

Filters are not that expensive if you avoid the glass screw in type. The
alternative is to use Cokin type filters which slot into a holder. These
are readily available through a number of outlets. I have them in stock at
CoCam Photo for example :-)



All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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