Shooting on manual with ISO on auto

Started Jan 13, 2013 | Discussions thread
ScottD1964 Senior Member • Posts: 1,748
Re: Shooting on manual with ISO on auto


I did not realize that metering was affected by the ISO.

Absolutely your metering is affected by ISO selction.  ISO is no different in affecting metering than adjusting your shutter speed or f-stop.  ISO (or what used to be ASA in the film days) was a standard set to allow users to know how light sensitive film was.  Lower ASA (Kodachrome 25) required 3 stops more light than the equivalent Fujichrome 200 to obtain the same exposure.  The lower the ASA/ISO the tighter and less visible the grain pattern in the film.  ISO 100 1/250 f5.6 is the same as ISO 200 1/500 f5.6 or ISO 400 1/500 f8.  While each setting will give you a different result in the end image they are all the same exposure based on the amount of available light on your image.

Manual is actually the very best way to learn the correlation between ISO, shutter speed, aperture, focal length, distance to subject and depth of field.  Set your camera on full manual and if shooting on a nice sunny day with the sun over your shoulder use the "sunny 16" rule as your starting point.  That rule states that in that type lighting your shutter speed wll equal 1/ISO at f16.  So shooting ISO 125 you'd be roughly 1/125 f 16.  You can then adjust from there. 1/250 f11, 1/500 f8, 1/1000 f5.6, 1/2000 f4.  You can easily adjust by 1/3 stop to tweak your exposure once in the range you're looking for 1/1000 5.6 = 1/800 f6.3 = 1/1250 f5.0

The problem with all the modern "bells and whistles" in new cameras is that very few people actually take the time to learn "the science" of photography.  They set the camera on auto this or auto that and fire away with no idea as to what is actually happening in the camera to create the image they are getting.

Take your time and learn the science and the art.  Unlike film, memory cards are reusable and offer instant gratification to see exactly what you shot.  You also have all the info in your exif data to be able to compare images and see exactly what you did to obtain an image.  Much easier than writing down exposure info on each shot.  Some modern camera conveniences are quite beneficial to the learning curve.



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