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Old 22nd April 2016, 07:20 PM
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Default Calcualting exposure w/o meter

I made an F mount pinhole for my Nikon. I wish to take some exposures at night. The f stop comes out to about f122. How would I calculate a night exposure for 400 speed film w/o a meter? My F5 has the multi-function back that allows for setting long shutter speeds. Bracketing will be difficult as the subject (train) will be moving slowly limiting this to a one shot must. Any help will be much appreciated.
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Old 22nd April 2016, 07:40 PM
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This will be a good start I think. The Ilford pinhole exposure calculator.
http://ilfordphoto.com/Webfiles/2011106152612113.pdf
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Old 22nd April 2016, 07:44 PM
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Here's another way. Put in your f-stop and away you go.
http://www.mrpinhole.com/exposure.php
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Old 22nd April 2016, 07:56 PM
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Is it possible at f122 and at night to get an exposure that is fast enough to stop a moving vehicle even a slow moving one with say even the fastest film D3200 set at say 6,400 or 12,800?

Mike
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Old 22nd April 2016, 08:19 PM
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Thanks Marty.

Mike I'm not interested in stopping it just getting some detail other then the head and running lamps. Considering using an off camera flash as well. Just playing with something new.

Where I'm going they have to slow down to under 10 MPH for safety regulations. People here in the USA think trains are in their way and have a habit of becoming squashed. Me? I love trains and am keenly aware they're nothing to be trifled with.
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Old 22nd April 2016, 08:39 PM
Mike O'Pray Mike O'Pray is offline
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Even 10 mph is 8.8 feet per sec but a train is a big object which might help so I have no idea how much detail will remain at what I'd imagine is a long exposure.

It might depend on the angle of the camera to the moving object. I'd be interested in how it turns out and would love to see a scan of the print.

Thanks

Mike
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Old 25th April 2016, 05:40 PM
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Be glad to send you one. However no trains arrived while I was there last night. Oh well.........next time.
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Old 26th April 2016, 06:56 AM
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Work out the exposure for f16 then add six stops plus whatever the film manufacturer suggests for reciprocity factor.


Steve.
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