Flowers have always held a fascination for me and they provide endless opportunities for great shots. When I’m not shooting commissioned work I always try to do some shots that have been filed away in the deep recesses of my mind. Many of these end up being published in one of my books, or as is the case here, hung in my gallery at London’s Oxo Tower.

Getting Started – Basic Kit
The advantage of using an SLR is the sheer array of lenses and accessories that are at your disposal, enabling results that are inconceivable with a compact digital camera. The two lenses that I used for the shots that accompany this feature were the Canon 24-70mm f2.8 and the 70-200mm f2.8 and these were fitted to my EOS 1DS.

Specialist Equipment – Extension Tubes
For these shots I also used extension tubes. Canon supplies these as a pair, but as an alternative you could use extension bellows. These accessories fit between the camera body and the lens. Extension tubes are available in various lengths and are usually sold in sets of two or three. The longer the extension tube, the closer you will be able to focus. You can also join the extension tubes together in various combinations for even greater magnification. However, whatever the combination that you choose, the distance from the lens to the subject is fixed. Extension bellows, on the other hand, have the advantage of infinite magnification and allow for more precise framing of your subject at closer distances.

Exposure Compensation
When using either of these accessories you will need to make an allowance for exposure as they increase the distance the light has to travel from the front of the lens to the sensor. Depending on the lighting that you are using this might mean using a slow shutter speed, and therefore a tripod will be essential.

Depth of Field
Depth of field with these pieces of equipment is minimal and becomes even less the closer you go. Although the more you stop down the greater the depth of field becomes, it doesn’t necessarily mean that your shot will be any sharper. All lenses have an optimum aperture for sharp focus: on a lens with an aperture range of f2.8 to f22, depth of field will be at its greatest when using f22. However, the sharpest shot could be one taken when the lens is set to f11, because diffraction – the bending or spreading out of light as it passes through a narrow aperture – reduces the overall image definition and resolving power.

Although the depth of field at these distances may be minimal, it still exists, so if you stop the lens right down and use the maximum depth of field possible, you must pay attention to the background – even at these distances, unsightly detail can come into focus when you take your shot that wasn’t apparent when you looked through the viewfinder at wide open.