[rollei_list] Re: Agfa Aviphot chrome/ Rollei CR-200 slide film
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 23 Mar 2013 08:58:05 -0300
A clarification, I meant , " blue (before processing)" and " yellow
(after processing)..." for "...blue (neg)/yellow(positive) layer..." ,
BTW, the color will be blue again in the positive.
Carlos
2013/3/23 CarlosMFreaza <cmfreaza@xxxxxxxxx>:
> 2013/3/22 John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>:
>> Without stealing his thunder, Emmanuel Bigler has said that CR-200, now
>> marketed by Maco, has its origins is a colour slide film designed for aerial
>> use - Agfa Aviphot. The yellow cast is required to compensate for UV at high
>> altitude. Emmanuel says that he uses a Wratten 82A to compensate but thinks
>> a 82B may do a better job when used at ground level.
>
> Agfa Aviphot Chrome 200 film for aerial photography (sold as "Rollei"
> film by Maco) is designed for low and medium altitude (up to 15000 ft
> or 5000m), it has an UV filter layer preceding the blue
> (neg)/yellow(positive) layer and as any regular slide film, it has a
> yellow filter layer after the blue/yellow layer, its only structural
> difference regarding other slide films is the UV filter layer. Since
> this UV filter blocks the UV light it could also block some blue light
> from the visible spectrum, this way the Aviphot chrome shows warmer
> colors than other slide films, but it does not show a yellow cast if
> well processed, it only shows warm tones; anyway there is a very
> short step from the warm colors to the yellow cast according I could
> see for some samples in the Web, film processing calibration seems to
> be very sensitive for this point. I think this is a film to use for
> distant landscapes mainly, the UV filter layer can be useful to block
> excessive blue light; perhaps I'll try it, there is a guy selling the
> Rollei CR 200 in the local eBay auctions site.
>
> Carlos
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