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Here are some of the questions I would be asking myself to help with the decision:
What is the minimum closest focus distance?
Typically, 50mm to 60mm macro lenses give 1:1 at 15 to 20cms; 100mm fl lenses extend this to 30cms so you are less likely to spook your subject.
Do you require the lens to have a tripod mounting ring?
Are size, weight and compactness important?
AFAIK, most decent macro lenses tend to be F2.8 and for adequate DOF, you will be working at F8 or F11 – beyond that the image can get soft due to the effects of diffraction at the smaller apertures. (F16 to F32).
If you will shoot with flash which can be set to provide the dominant light source, thus overwhelming daylight (3 to 4 stops under exposed), then your shutter speed effectively become the flash duration which usually is a minimum of 1/1000 sec. This usually means that Image Stabilisation is not required.
Will you be taking photos of static subjects or stuff that moves, such as insects?
Cheers
Dennis
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