Originally Posted by
Dave Humphries
Hi Brian,
Apart from the diffusion of the light source (to make it 'bigger' relative to the subject), consider (if lit by a single source) the contrast ratio of the shadow areas, suggesting that a white reflector (paper/card) opposite the light source would help.
The real knack with shooting such (e.g. shiny) items is to consider what's reflected back to the lens. This suggests you need to arrange suitable colour/brightness surfaces to appear as the the reflections. Depending upon the shape of the item this can be easy or much harder and while I (generally) understand the theory, I don't have enough experience yet to know all the answers.
With sufficient time, I suggest we just tackle each subject as a mental exercise in predicting the reflections the camera will see, then place white or black card around the subject to ensure these contribute to either lighting the subject, or defining its shape. In other words, there's no point having a perfectly flat/evenly lit subject if that very lighting doesn't allow us to see what shape it is, that's where the black card comes in.
Sometimes, usually for larger subjects than this, it is necessary to shoot multiple exposures (with different lighting for each to enhance specific areas) and combine those different areas of the subject in post processing to achieve a 'great' image. This is particularly true of subjects which are both shiny and translucent/transparent. Having said this normally applies to larger subjects, it is equally applicable for your macro-sized subjects, just that everything has to be scaled down accordingly - and I suspect things might get impossibly fiddly, if you know what I mean.
HTH,
Dave