Hi Ken
Macro lens are tuned to be very sharp at the short end of the focus range and have a short minimum focus distance (MFD).
1:1 is life size and refers to the 35mm format. The idea is that the object will be life size on the film. e.g a 1mm ant will be 1 mm on film.
1:4 will be quarter life size. Don't forget the 300D has a 1.6 crop factor which makes the end result a bit confusing.
Marco lens tend not to focus to infinity very well. In some cases a lens element moves if a lens has a macro switch.
A thing to consider with macro work is that the lens is close to your subject and getting light on the subject becomes a problem.
So you may need to consider longer focal length lens to help with this.
Rob
Last edited by robski; 16-12-05 at 15:38.
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