Part one: Project 1 The instrument

Exercise 1.1

My camera (Canon EOS70D) does not have an Automatic mode.  For the purposes of this exercise I have therefore used its SCN/Portrait mode which sets aperture and exposure automatically so that I have had no input into the settings that the camera has used.

I have first taken shots in a controlled, steady, environment: in a darkened room (at about 17.50 so that there was no light from outside), camera on a tripod, remote shutter release, one fixed LED light source, and indirect flash from a camera mounted flashgun with diffuser.  The pictures were taken about a minute apart.

Screen Shot 2017-02-02 at 17.23.06.pngScreen Shot 2017-02-02 at 17.24.19.pngScreen Shot 2017-02-02 at 17.24.52.png

To my eye the results are almost indistinguishable.  Such differences as there are are very slight and I suspect are the result of me moving my face away from the light from the flashgun so that there were subtle changes in the way the light bounced onto the subject.

For the sake of comparison I tried the same exercise but outside in the garden, taking some pictures of early snowdrops (with a 100mm 1.28 macro lens).  Again the camera was mounted on a tripod with a remote shutter release.  Weather conditions were sunny but windy.  The shots were taken a minute or so apart from about 12.25.

This time the differences are striking, not only as is evident from the histograms but also from the differences in ISO, aperture and exposure (again I used the camera in SCN/Portrait mode).

screen-shot-2017-02-14-at-16-30-17 screen-shot-2017-02-14-at-16-29-52 screen-shot-2017-02-14-at-16-28-05

 

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