'Stella Compact' is a self-fertile cultivar of the wild sweet cherry, Prunus avium. As alluded to by the cultivar name, this is a compact form of Prunus avium 'Stella', a popular cherry introduced as a fruit crop in 1968 via the Summerland Research Station in British Columbia.

The Virginia Cooperative Extension has an excellent resource on Growing Cherries in Virginia, though much of what is in the article is applicable anywhere.

Photography resource link: Understanding Lens Diffraction, a new article by Michael Reichmann of The Luminous Landscape. Fairly technical, but it can help you better understand your lenses.