Water, fire, and exploding models should be as large as the budget and safety allows, even half-size if possible and shot high-speed. Intense wind can help break up out of scale water droplets and in some cases, fire. Exploding models should be pre-broken, reassembled, and exploded within slow-moving, low-powered, and colorful pyrotechnics preferably with two or more blasts. Other types of models can be built just big enough to be adequately detailed and still carry depth of field.
Miniature explosions and fire can be dangerous because the camera may need to be in close proximity to the miniature. Plan accordingly.
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