For a definition of ISO please see Film Speed.
Butterweed among colored rocks photographed along the grapevine hills trail in Big Bend National Park in the spring of 2023.
Dew on a Big Bend Bluebonnet photographed early in the morning near Santa Elena Canyon in Big Bend NP in the Spring of 2023.
The Big Dipper (Ursa Major) above Dorgan House was photographed in Big Bend National park during the spring of 2023.