Are you sure you don't mean a little bit less?

I'm pretty sure, but I have been sure before, only to find I was wrong.

Btv. this method is great for any kind of backdrop, not just skies and sceneries.

Absolutely! And the greatest advantage is that a sky image will always render a perfectly exposed image, no matter the lighting conditions. A backdrop affixed to a box or a wall will need lighting, and even then might not render at it's best.

Cec