You asked

Is the leica apo macro elmarit sl 100mm f 2 8 good for macro photography?

Yes, for most macro work this lens is a sensible choice. A 100mm macro gives you room to work from a comfortable distance, which matters with small subjects like insects or flowers. It's also autofocus, and f/2.8 lets in plenty of light for close shots. The catch is that it isn't stabilised, so use a fast shutter speed or a tripod when you're close.

On a full-frame body it frames at a true 100mm. If you shoot on an APS-C body, it frames more like 150mm, which is tighter still. Good full-frame pairings from the list include the Leica SL3 and the Panasonic Lumix S5 II. For APS-C, the Leica TL2 works well.

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