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Several issues happen when using macro lenses.
The longer the mm length the further you will be from the flower. The perspective also changes making the flower smaller in relation to the background. Long lenses have less depth of field so the background will blur more with eh long lenses. This can be a problem since when used at the faster f-stop openings you may not be able to get the entire flower in focus.
The 30mm wide angle will give you the most depth of field and keep more in focus. All the varying factors go into deciding which to buy.
I do not think you will like the 100mm which on your camera is the equivalent of 200mm on a 35mm film camera. You will not get the entire flower in focus without supplemental studio lighting.
Try both the 30 and 50mm before buying. A full line camera shop will let you try them. With the 30 mm you will shooting about 1 foot from the flower and with the 50mm between 1 1/2 to 2 feet. This may be very important to you. The 100mm will get you about 4 feet away but you may not like the results of the limited focus.
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jerry
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