In needed to take my 600mm lens back to Canon in January as I’d lost the little nut which holds the collar on. The service centre is just down the road in Elstree.

On the way back I stopped off at Tyttenhangar Gravel Pits to make sure the lens was working OK. There wasn’t any wildlife about due to the snow, so I tested it on the local flora.

The little white dots you can see are snow flakes, not sensor dust!