Archived posting to the Leica Users Group, 2006/01/10

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Subject: [Leica] Underexposure in Tungsten Light
From: r.s.taylor at comcast.net (Richard S. Taylor)
Date: Tue Jan 10 09:35:44 2006
References: <p06230921bfe96e361e17@[10.0.1.2]><F5A7E4FC-1680-470E-A3FE-A0D3959F8A5C@ma c.com> <p06230900bfe992d90a1f@[10.0.1.2]> <014501c6160a$0fe83cc0$2501a8c0@chartertn.net>

Thanks John.  Looks like the solution is to shoot ISO 400 film at no 
more than ISO 200 and maybe lower.

Everything goes against you in tungsten light.  The meter is more 
sensitive and the film less so.

I'm either going to have to get some f1.4 lenses or start using faster film.


>  > Ah, so I'm not alone in this.  Next time I'll derate the film a stop
>>  and let you know what happens.
>>
>>  I've seen the effect on both BW400CN and Fuji Press 400 (color neg).
>>
>
>All normal (not extended red or IR) film emulsions loose sensitivity
>starting at about 620-630mu which means that tungsten illumination, which
>tends to be reddish orange, is only seen at a lower sensitivity (speed).
>Indeed, normal incandescent lighting needs 1 stop overexposure but some weak
>tungsten light may need as much as 2 stops more exposure.  The light meter
>sees red better than film does.
>
>JB
>
>
>
>
>_______________________________________________
>Leica Users Group.
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-- 
Regards,

Dick
Boston MA

Replies: Reply from jblack at ambio.net (John Black) ([Leica] Underexposure in Tungsten Light)
In reply to: Message from r.s.taylor at comcast.net (Richard S. Taylor) ([Leica] Underexposure in Tungsten Light)
Message from r.s.taylor at comcast.net (Richard S. Taylor) ([Leica] Underexposure in Tungsten Light)
Message from jblack at ambio.net (John Black) ([Leica] Underexposure in Tungsten Light)