-----Original Message-----
From: gary edwards <maitani@xxxxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
Date: Monday, June 21, 1999 12:35 PM
Subject: Re: [OM] Odd OM4 behavior - oops, nevermind.
>The measured exposure time.
Using a constant illumination scene [the dimly lit wall] and a set aperture,
along with a set shutter speed, how are any of the 36 exposure times going
to differ?
jh
>
>>From: "John Hudson" <jahudson@xxxxxxxxx>
>>Reply-To: olympus@xxxxxxxxxxxxxxx
>>To: <olympus@xxxxxxxxxxxxxxx>
>>Subject: Re: [OM] Odd OM4 behavior - oops, nevermind.
>>Date: Mon, 21 Jun 1999 09:37:29 -0700
>>
>>
>>
>>-----Original Message-----
>>From: gary edwards <maitani@xxxxxxxxxxx>
>>To: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
>>Date: Monday, June 21, 1999 9:02 AM
>>Subject: Re: [OM] Odd OM4 behavior - oops, nevermind.
>>
>>
>> >Film reflectivity variation is a trivial issue (I think). If it concerns
>> >you, here is how to test for variation. Set up you OTF capable OM
>>looking
>> >at a constant illumination scene. A solid wall dimly illuminated by
>> >artificial light would be good. Select an aperture that gives you an
>> >automatic exposure of, say, 60 s. Shoot 36 test shots with one film
type,
>> >carefully timing the exposure with a stopwatch. Load another type of
>>film
>> >and, without changing the film speed setting (or anything else), make 36
>> >more test shots (the more the better to average out measurment errors).
>> >This would be a good way to use up a couple of out of date rolls. Throw
>>the
>> >exposed film away and report your results. Include the number of
>>samples,
>> >the variation of each film type (standard deviation of 36 measurements),
>>and
>> >the film types. My bet is that the standard deviation for each roll
will
>>be
>> >about the same magnitude as the difference between rolls.
>> >
>>Boy am I confused! Is the intention to take 36 identical test shots each
>>one
>>at 60 seconds [..."60 s"] with a constant aperture and then repeat the
same
>>exercise with another but different brand of 36 exposure film? The two
>>exposed reels of film are then "thow[n] away....." and the the results are
>>reported. What are the "results" that are being reported upon? What is all
>>the data that is being used to calculate the standard deviation? Standard
>>deviation of what?
>>
>>jh
>>
>>
>>< This message was delivered via the Olympus Mailing List >
>>< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
>>< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>>
>
>
>_______________________________________________________________
>Get Free Email and Do More On The Web. Visit http://www.msn.com
>
>< This message was delivered via the Olympus Mailing List >
>< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
>< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
>
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|