Thumbnail for NPF: The New Rule for Shooting the Sharpest Stars in the Sky

Article · National Parks at Night

NPF: The New Rule for Shooting the Sharpest Stars in the Sky

By Tim Cooper

Type
Article
Level
Intermediate
Price
Free
Published
2019
Open on National Parks at Night(opens in a new tab)

About this lesson

Compares the 500 rule with the NPF rule and shows how pixel pitch, aperture and focal length change the longest star-sharp exposure. Includes worked examples and calculator use.