DA

Stands for Digital Auto, which features on a range of Pentax lenses that (unlike some earlier ranges) don’t have a manual aperture ring. They have a ‘Quick Shift’ mechanism that enables you to override focus manually, even when the lens is set to autofocus.

DA*

The premium lens range from Pentax, which Combines weatherproofing with the advantages of the DA range.

Sources:  Pixabay, NASA,Wikipedia, Susan Wingfield Lamar High School