Digitalis (Foxglove)

A genus of highly toxic and rather rare plants (in the wild) that are indigenous to Europe. Foxglove is also a popular garden plant and has invaded the United States. Metabolites of the foxglove are used in medicine and molecular biology.


Recommended links: Kew Royal Botanical Gardens, Pubchem (Digitoxin), Pubchem (Digoxin), Royal Horticultural Societey, USDA, Wikipedia (Digitalis), Wikipedia (Scrophulariaceae)

Blog posts: 

Depth of field (DOF)

In photography, the depth of field (DOF) is distance from closest to the farthest points (in relation to the position of the camera) that appear sharp. Important factors that affect the DOF are the focal length of the lens and the aperture.


Recommended links: Cambridge in Color, Dylan Bennett Youtube, MIR, MOPS Werk, Wikipedia

Blog posts: 

• Tilt-shift moderation: Depth of field

Dungeness crab (Metacarcinus magister, formerly Cancer magister)

The Dungeness crab is culinarily important crab that occurs on the west coast of North America, from Alaska to California. It is named after the town of Dungeness, where it was harvested commercially for the first time.


Recommended links: California Department of Fish and Wildlife, Fisheries and Oceans Canada, dungeness.com, Wikipedia

Blog posts: 

Drosophila melanogaster (fruit fly)

A species of fly that is distributed worldwide and widely used as a model organism for basic biological research. 


Recommended links: Animal Diversity Lab, Berkeley Drosophila Genome Project, Encyclopedia of Life, FlyBase, Wikipedia

Blog posts:

Dogwood

Designation for plants, mostly trees, belonging to the genus Cornus. Different species occur in North America, Europe, Eurasia and Asia. Some well-known species have inconspicuous flowers, that seem, however, very flashy because of specialized leaves (bracts). The species Cornus florida is native to the eastern United States and is cultivated in temperate regions all over the world (including Switzerland).


Recommended links: British trees, Portland nursery, Royal Horticultural Society, USDA, Wikipedia (dogwood/Cornus), Wikipedia (Cornus florida), Wikipedia (bract)

Blog posts: 

Diorama effect (miniature faking)

An optical effect that makes a scene in a photograph appear as if it was a miniature model due to a very shallow depth of field. The effect can be achieved by tilting the lens or be applied digitally.


Recommended links: Design Your Way, Gimp tutorial, Popular Mechanics, Wikipedia

Blog posts:

DX Nikkor lenses

Nikon lenses with an image circle that covers only the size of the DX digital sensor (15.8x23.6 mm). The lens mount itself is compatible with almost all Nikon SLRs.


Recommended links: Ken Rockwell, Nikon, Thom Hogan, Wikipedia

Blog posts:

Diavolezza

A skiing area and top station of an aerial railway in the Engadin in Switzerland. There is also a restaurant and a hut for hikers. Diavolezza is famous for the breathtaking view of Piz Palü, Bellavista, Crast' Agüzza, Piz Bernina and Piz Morteratsch.


Recommended links: Diavolezza.ch, engadin.stmoritz.ch, Wikipedia

Blog posts:
-In memoriam of my Konica FT-1

Dewey Square Plaza, Boston

Dewey Square Plaza is a lively square in downtown Boston (Massachusetts) that for example home to a farmers market.


Recommended links: Farmfresh, The Rose F. Kennedy Greenway, Wikipedia

Blog posts: Intertwined lights and shadows in Boston

Diffraction

In photography, diffraction describes the bending of light waves that occurs at small apertures irrespective of camera or lens. The aperture at which diffraction becomes visible (i.e. reduces the sharpness of your photographs) depends on the size of the pixels in your digital camera.

Recommended links: Bob Atkins, Cambridge in Color, Camera-Wiki, FSTOPPERS, Ken Rockwell, Luminous Landscape, Luminous Landscape 2, Wikipedia

Blog posts: