In photography, stopping down is the act of increasing the f-stop number, thus decreasing the size (aperture) of the iris of a lens, for example, stopping down from f2 to f4. This increases the depth of field of the image and allows less light to reach the film plane. To compensate for the latter, it is necessary to increase the exposure time, use a photographic film with a higher ISO rating, using or increasing the strength of artificial lighting, such as electronic flash or, in digital cameras, increasing the light sensitivity of the sensor.

In general, stopping down increases image sharpness. This is true for out-of-focus objects, and for cameras with inexpensive or simple lenses, because spherical aberration, coma and astigmatism) are less apparent at smaller apertures. High quality lenses are corrected for these aberrations, and usually give the sharpest images for in-focus objects at about one or two f-stops below maximum aperture. When using very small apertures, diffraction reduces sharpness. One generally obtains a sharper image by stopping down one or two f-stops because lens designers optimise their designs for a compromise between admitting the most light to shorten the exposure time and producing a sharply focussed image. If the lens designer optimised for sharpness only, the lens would have a small minimum aperture and would be sharpest at full aperture, but would produce too dim an image for some poorly lit scenes.

Sean Michael Anderson (born March 25, 1988), better known by his stage name Big Sean, is an American rapper. Big Sean signed with Kanye West's G.O.O.D. Music in 2007, and then in 2008 signed with Def Jam Recordings.

Sean Michael Anderson was born in Santa Monica, California, and he moved at two months old to west Detroit (6 Mile and Wyoming) where he was raised by his mother and grandmother. He attended Detroit Waldorf School and graduated from Cass Technical High School with a 3.7 GPA. Big Sean is often heard saying " west side " in his songs; he is referring to the west side of his hometown Detroit, Michigan. In his later years in high school, Sean gained a valuable relationship with Detroit hip hop station WHTD; he would show his rhyming skills on a weekly basis as part of a rap battle contest held by the station.

In 2005, Kanye West was doing a radio interview at 102.7 FM. Hearing about this, Sean headed over to the station to meet West and perform some free-style. Initially Kanye was reluctant to hear the emcee, however he gave Sean 16 bars to rap for him, eventually according to Big Sean "As we get to the entrance of the radio station ... we stopped in the middle of the doorway. He starts looking at me and bobbing his head,". He left a demo-tape as well. Two years later, West finally signed Big Sean to GOOD Music.

Lene Vestergaard Hau (born in Denmark, on November 13, 1959) is a Danish physicist. In 1999, she led a Harvard University team who, by use of a superfluid, succeeded in slowing a beam of light to about 17 metres per second, and, in 2001, was able to momentarily stop a beam.

In 1989, Hau accepted a two-year appointment as a postdoctoral fellow at Harvard University. She received her degree from the University of Aarhus in Denmark in 1991. Her formalized training is in theoretical physics but her interest moved to experimental research in an effort to create a new form of matter known as a Bose-Einstein condensate. In 1991 she joined the Rowland Institute for Science at Cambridge as a scientific staff member. Since 1999 she has held the Gordon McKay Professor of Applied Physics and Professor of Physics at Harvard. She now is the Mallinckrodt Professor of Physics and Applied Physics at Harvard.

Dr. Hau’s scientific and service contributions have been recognized through honors that include:

Dr. Hau recently was awarded an honorary appointment to the Royal Danish Academy of Sciences and Letters and was elected a foreign member of the Royal Swedish Academy of Sciences in 2008.

Darnel Robinson,(born September 4, 1969) better known by his stage name Dru Down, is an American rapper and actor from Oakland, California. He is a member of The Regime, a collective of rappers that includes Yukmouth, Tech N9ne, Messy Marv, BG Bulletwound, Dorasel, Grant Rice, Tha Realest and Gonzoe...

The title track of his 1996 album Can You Feel Me was a minor hit. He's performed with Spice 1, E-40, Richie Rich, Shock G, Yukmouth, The Luniz, and other Bay Area rappers, and introduces the 2Pac song "All About You". Dru Down also plays a part in the 1996 movie Original Gangstas He had a short tenure with Ruthless Records in 2001-2002, although the album was ultimately released via C-Note Records, this fact is alluded to in the beginning of his album, Gangsta Pimpin'. In 2001 he released a movie of his own named Hip Hop & Porn Stars. Currently Dru is signed to rapper Yukmouth's Smoke-A-Lot Records and owns his own record label entitled Pimp On Records.Dru Down released his 2010 album Chronicles of a Pimp on November 16.