Just remember that a 1 stop increase from a 4 minute exposure is 8
minutes + reciprocity adder. :-)
ps: I agree with Moose's recommendation of Fred Parker's guide. I've
had it on the computer for years but always forget about it.
Chuck Norcutt
On 5/16/2011 3:27 PM, Walters, Martin wrote:
> Moose:
> Thanks for that link. Something that I'll digest before the next course.
> I've found a copy locally of the Kodak Master Photo Guide, which I
> should be picking up tomorrow.
>
> I'm starting to think that at the light levels expected, combined with
> the latitude of the film and RF, that a ballpark light reading will be
> fine, when combined with bracketing.
>
> Martin
> -----Original Message-----
> From: Moose [mailto:olymoose@xxxxxxxxx]
> Sent: Monday, May 16, 2011 3:11 PM
> To: Olympus Camera Discussion
> Subject: Re: [OM] Long exposures with an OM2N - advice needed
>
> On 5/16/2011 9:57 AM, Chuck Norcutt wrote:
>> I'd still recommend skipping the meter unless you want it for other
> applications... just don't try to use it here. Also, forget auto mode
> and switch to "B" and your watch.
>
> I agree with Chuck. I suggest spending some quality time with Fred
> Parker's "Ultimate Exposure Computer". It's all worth reading, and I
> remember to do so every so often.
> <http://www.fredparker.com/ultexp1.htm#top>
>
> Of particular interest to your problem, giving far more info on
> practical very low light EV values than I've seen elsewhere, is the
> "Exposure Value Chart"
> <http://www.fredparker.com/ultexp1.htm#Light%20Intensity%20Chart>
>
> So, for example, "Night, away from city lights, subject under crescent
> moon." is EV -5
>
> If you have a light meter with EV values on it, you may simply set the
> film speed and aperture for its lowest setting, read the EV and double
> the time for each step down to EV -5.
>
> Or you can work with his "Exposure Factor Relationship Chart"
> <http://www.fredparker.com/ultexp1.htm#EXPOSURE%20FACTOR%20RELATIONSHIP%
> 20CHART%20B>
>
> It doesn't go down quite to where you may be going going, but the
> exposure math is simple. His chart says -5 EV is 1 min, f5.6, ISO 1600,
> which is 8 min @ ISO 200
>
> You'll need to add your own reciprocity failure adjustments from the
> Portra data sheet.
>
> On 5/16/2011 10:07 AM, Ken Norton wrote:
>> I'm also in favor of the Kodak reference book. Can't remember what
> mine is called, Professional PhotoGuide or something like that. In it is
> a table, and circular calculator for determining exposures for various
> film speeds under various available-darkness photographs. It even brings
> in the subject of reciprocity failure.
>
> I have the Kodak Master Photo Guide. Its "Existing Light Exposure Dial"
> doesn't go beyond ISO 400, 6 sec. @ f16 for "Floodlighted Buildings,
> Fountains, Monuments."
>
> The above guide is more useful, as far as I can see.
>
> No Light Moose
>
> --
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