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In super macro mode, there is a minimum focussing distance. Any closer, and you have no hope of locking in a focus. So, be sure you don't go past this point.Close up pics have a very shallow "depth of focus" meaning that very little in front or behind what you focussed on will be in focus. Is anything in focus in your pics? If you can exert some manual control over lens openings, you could try using a smaller opening to get more of your subject in focus. When taking close-ups, always use a tripod.
Select Macro Mode - this is a fairly obvious first step but I’m always surprised by how many digital camera owners haven’t explored the shooting modes that their camera has. Macro mode is generally symbolized with a little flower and when selected it will tell your camera that you want to focus on a subject closer to your lens than normal (the minimum distance allowed will vary from camera to camera - consult your instruction manual to find yours). Macro mode will also usually tell your camera to choose a large aperture so that your subject is in focus but the background is not.
All cameras have a minimum focal length. That is the minimum distance they have to be from an object in order to focus clearly. If you have a digital camera with changeable lenses, that minimum focal length is determined by the lens and how it is constructed. If you have a fixed lens digital camera then the manual should tell you what the minimum focal length is.
One other thing to keep in mind is that on most fixed lens digital cameras, there is what is called a macro setting. If you switch to macro mode, it will allow you to get closer to the object and still get a good focus. Your manual should tell you how to turn on that mode.
(From Sigma lens literature) Capable of macro photography, this
lens has a 1:2 maximum close-up magnification at the 300 mm focal
length. It's the ideal high performance lens for portraits, sports
photography, nature photography, and other types of photography that
frequently use the telephoto range. It also has a switch for changeover
to macro photography at focal lengths between 200mm and 300mm with a
maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing
distance is 1.5m / 59 in. at all zoom settings.
In wide-angle macro mode, the minimum focus range is as close as 30cm from CCD (21cm from the lens front.) At this point, the magnification is 0.03x (equivalent to 0.12x in 35mm format).(Focal length is 7.2mm. At maximum magnification 283mm x 213mm of the subject can be captured.) In telephoto macro mode, the minimum focus range is 25cm from CCD (13 cm from the lens front) and the magnification is 0.18x (equivalent to 0.7x in 35mm format). (Focal length is 42.7mm to 50.8mm. At maximum magnification 52mm x 39mm of the subject can be captured.)
In wide-angle macro mode,
the minimum focus range is as close as 30cm from CCD(21cm from the lens front.)
At this point, the magnification is 0.03x (equivalent to 0.12x in 35mm format).
(Focal length is7.2mm. At maximum magnification 283mmx213mm of the subject can be captured.)
In telephoto macro mode, the minimum focus range is 25cm from CCD(13cm from the lens front )and the magnification is 0.177x (equivalent to 0.7x in 35mm format).
(Focal length is42.7mm to 50.8mm. At maximum magnification 50mmx37mm of the subject can be captured.)