[pure-silver] Re: EI testing with Minolta Spotmeter
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 23 Apr 2006 19:58:42 +0200
Paul
Keep in mind that the result still results into a minimum exposure. Film
doesn't mind a little more light, but it doesn't like underexposure at all.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2006-04-23 19:12, "Paul Mead" <paul.mead@xxxxxxxxxxx> wrote:
> That's fantastic Ralph, thanks. Sounds far less complicated than the
> other version.
>
> Regards
>
> Paul
>> Let's say you're using a film with an advertised speed of 400 ASA and your
>> meter is set to that speed, and expose the first frame as the meter suggests
>> for a gray card. Then give 1/2 stop less for the next frame, 1 stop less for
>> the frame after that, and so on. After 9 frames you can stop and fill the
>> rest of the roll with the first exposure setting. Process the film normally.
>>
>> Now evaluate the film. Now starting with the first frame, count in the
>> following sequence 25, 35, 50, 70, 100, 140, 200, 280, 400, until you get to
>> the frame with a Zone I density. The counting sequence will reveal your EI.
>> Feel free to interpolate if the Zone I density is in-between frames.
>>
>> Why does this work?
>> Zone V is 4 stops away from Zone I. That means the first frame was
>> overexposed by 4 stops in order to generate a Zone I, if the box speed is
>> correct. Overexposing a 400 ASA film by 4 stops is equivalent to exposing it
>> as 25 EI. With increasing frame numbers, the overexposure is reduced and you
>> are getting closer and closer to the advertised film speed.
>>
>>
>>
>
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