New York artist Eric Cahan either gets up very early or stays out very late - but whatever system he's got going we're convinced it's worth it.

Take a look at this set of photographs which are part of his 'Sky Series' of works.

Shot at dawn, and often at sunset too in locations all over the world - but mostly in the States - Cahan's skilled camera work has an otherworldly and painterly quality.

"The actual process is done with colored resin filters I make myself and hold in front of the lens before I shoot a picture." Cahan explains of his technique for conjouring these vivid hues.

"When a color filter is used against a blue sky, it always alters the color of the sky. I know the colors I am trying to conjure and choose the filter accordingly."

Evidently not suffering from that phenomenon of dramatic sky photos never turning out quite as good as the real thing, we'd say this series ably captures nature at its most breathtaking.

"My mission is to capture light. Light is the true subject of this series: its constant mystery, the way it shifts and colors everything around it in nature.”