A crock of gold?

In the field behind my house.

This morning.

I wish.

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Any advice on capturing the vibrancy of a rainbow would be much appreciated. As often is the case, I just grabbed the camera and snapped on auto in a panic before trying a few different settings. I'm not even sure which of the 77 versions this one is, apart from the crop it's straight out of the camera... but it's very noisy and the colours don't look anything like they did in real life!