From: Sandy King (sanking@CLEMSON.EDU)
Date: 10/15/02-11:59:51 AM Z
I meter primarily using the incident system. To calculate SBR I take
two readings, one in the shadows and another in the most brightly
lit area of the scene. I add the difference to five, which would be
the SBR for a scene in absolute flat lighting, to get the SBR. I
base the exposure on the shadow reading. Since the shadow reading by
itself will usually indicate overexposure of about one stop I
compensate by doubling the EFS of the film for the SBR in question.
I don't work with Zones unless using the Zone system, in which case I
apply the N+ and N- system.
Sandy King
>When you use SBR 10 or any number, how do you calculate ?
>Between zone I & VIII, III & VIII ?
>
>Philippe
>
>> De : Sandy King <sanking@clemson.edu>
>> Répondre à : alt-photo-process-l@sask.usask.ca
>> Date : Mon, 14 Oct 2002 20:07:15 -0400
>> À : alt-photo-process-l@sask.usask.ca
>> Objet : Re: paper and film testing
>>
>
>> I find it odd that the EFS would be 250 regardless of time of
>> development. In looking at several different tests I have done with
>> TRI-X, when the choses DR is set to 1.4 (close to your 1.38 for AZO)
>> I get approximately the following results, which are something of an
>> average I got in tests with HC-110 1:20, Pyrocat 2:2:100, and ABC+
>> 1:1:50.
>>
>> SBR 10 EFS 100
>> SBR 9 EFS 160
>> SBR 8 EFS 250
>> SBR 7 EFS 320
>> SBR 6 EFS 400
>> SBR 5 EFS 500
>>
>> Sandy
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