Additional memory card, or better, IBM Microdrive. You can't live without it. 

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Digital cameras are battery eaters. You will need few packs of NiMH batteries, or better, the external battery pack.

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...and battery charger.

10_accessories_polnilec.jpg (13639 bytes)

AC adapter will be very useful for saving the batteries when working in studio or downloading bigger amounts of pictures.

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The Close-up diffuser, attached to the camera's accessory shoe, provides soft lighting for close-up pictures captured with a built-in flash.

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Remote cord. It will be necessary to provide remote control of the shutter-release to prevent blurring. Also provides remote auto focus control.

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You will need a tripod for close-up pictures captured with longer shooting time values. This small one will be very useful for photographing in nature.

 10_accessories_stojalo.jpg (18642 bytes)

If you want to use bigger filters as lens thread is, the adapter will be necessary.

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Polar filter is not necessary for macros, but sometimes is very useful. It should be very thin otherwise the vignettes on the edges of pictures could be visible.

10_accessories_polar_filter.JPG (8103 bytes) 

Instead of common filters, the better solution could be Cokin filter adapter

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The focal length could be changed with a add-lenses.

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For special purposes, the half lens could be used

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And, finally, for special purposes, a 50 mm lens...

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which can be fixed on the objective of your SLR-like only with a special coupling ring. You will hardly find it in photo stores. This one was made of 49/52 mm and 55/52  adapters by gluing them together. 10_accessories_coupling_ring.jpg (57554 bytes)
An finally, if you have a SLR digital camera the best magnification results will be reached with use of extension tubes.  10_accessories_extension_tubes.jpg (54550 bytes)