Day Lilly VII

Posted: July 28, 2009 
Filed under: Floral
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Description

This is a photograph of a Lilly, one of seven such photographs.  Each one of these was taken with my Nikon FM2 using Kodakrome colour positive slide film (100 ISO) and my Sigma 70-300mm apochromatic macro zoom lens.  I had to use a tripod for this shot because both flowers were in the shade of a very large oak tree.  In order to get the second flower in any degree of focus, I had to use a smaller aperture for greater depth-of-field, which requires a slower shutter speed to compensate.  Combined with the fact that 100 ISO film is about as slow a film speed as you can buy (though they can go down to 50), I was working well below hand-held shutter speeds.  It is important for young photographers to remember, one shift in shutter speed, film speed or f-stop is equivalent to doubling of halving the light hitting your film.  That is, if you shift from f/8 to f/16, or from 1/125 to 1/250, you are halving the amount of light hitting your film.  In reverse, you’d be doubling the light.  Thus, if you shift aperture, you should compensate by adjusting shutter speed when possible, or on digital cameras you can adjust film speed instead.

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