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<p>lunar rainbow, or nighttime rainbow can be seen on strongly moonlit nights. As human <a href="page.php?w=visual_perception">visual perception</a> for colour is poor in low light, moonbows are often perceived to be white.</p>

<p>It is difficult to photograph the complete semicircle of a rainbow in one frame, as this would require an <a href="page.php?w=angle_of_view">angle of view</a> of 84°. For a <a href="page.php?w=135_film">35&nbsp;mm</a> camera, a <a href="page.php?w=wide-angle_lens">wide-angle lens</a> with a <a href="page.php?w=focal_length">focal length</a></p><p>
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