Be careful with wide apertures
Here’s a tip: be careful to actually get the subject in focus when using wide apertures in gloomy conditions.
Today’s phyoto of the day illustrates the problem: a nice mossy tree in some gloomy woods at Cwmdare Country Park. I chose a wide aperture to let in more light because I was already at ISO 800. But the narrower depth of field means the whole tree is far from in focus – even with the 24mm lens.