Archived posting to the Leica Users Group, 2017/08/16

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Subject: [Leica] Film exposure error - how to correct it
From: chris at chriscrawfordphoto.com (Christopher Crawford)
Date: Wed, 16 Aug 2017 05:53:16 -0400
References: <6d78d76f-12f9-6478-b8b4-4c7eede3176f@summaventures.com> <DB0F210A-1560-4D22-9A9C-2EA95A2E8E0D@gmail.com>

Which photos are more important? The thing is, if you develop for 400, the
125 shots will be very high in contrast. Actually, the 400 shots will be
too, since that?s what push processing does (mostly increases density of
midtowns and highlights, only slightly brings up shadow detail). If you
develop for 125, the 125 shots will be good, the 400 shots almost 2 stops
underexposed.

-- 
Chris Crawford
Fine Art Photography
Fort Wayne, Indiana
260-437-8990

http://www.chriscrawfordphoto.com  My portfolio

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On 8/16/17, 5:43 AM, "LUG on behalf of Dan Khong"
<lug-bounces+chris=chriscrawfordphoto.com at leica-users.org on behalf of
dankhong at gmail.com> wrote:

>I would develop for ISO 400.
>
>Sent from my iPhone
>
>> On 16 Aug 2017, at 5:21 PM, Peter Dzwig <pdzwig at summaventures.com>
>>wrote:
>> 
>> All,
>> 
>> I put my M3 back in to use over the vacation. I was exposing the film
>>in it as
>> ASA400 assuming that I had one of my usual films in it.
>> 
>> HOWEVER ( :-( ) I found that I had a roll of 125 ASA FP4+ in it when I
>>came to
>> the end of the roll. When I started using it I had noticed that I had
>>already
>> exposed some 10 frames. So I have 10 frames exposed at 125 ASA and 25 -
>>or
>> thereabouts - exposed as 400 ASA. Most of the shots taken when I was
>>assuming it
>> was 400 were exposed in the region of f8 - f16 at 1/500th.
>> 
>> I send film to Ilford to process. My question is: how should I tell
>>them to
>> develop it?
>> 
>> I think I have the following options:
>> 
>> (i) DON'T - just bin it and write it off to bad luck!
>> 
>> (ii) Develop it as (say) 200 ASA, accept that some will be
>>under-exposed and
>> that the rest will be over exposed and sort it out when I scan the film
>>and play
>> with it in PS or NikFX (or whatever). The short exposure times on the
>>400 ASA
>> shots may help as they will be on he darker side.
>> 
>> (iii) Develop it as one or the other (125 or 400 ASA)
>> 
>> Any other thoughts/recommendations?
>> 
>> Peter
>> 
>> PS I know that I should shoot a whole roll before i forget what the
>>film is and
>> go off on autopilot :-)
>> -- 
>> 
>> ===========================================================
>> Dr Peter Dzwig  
>> 
>> 
>> _______________________________________________
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>
>_______________________________________________
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Replies: Reply from pdzwig at summaventures.com (Peter Dzwig) ([Leica] Film exposure error - how to correct it)
In reply to: Message from pdzwig at summaventures.com (Peter Dzwig) ([Leica] Film exposure error - how to correct it)
Message from dankhong at gmail.com (Dan Khong) ([Leica] Film exposure error - how to correct it)