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Canon L Lens by jojo

Characteristics

L-lenses have superior optical performance and are typically built with a solid construction to withstand constant use and harsh conditions.[citation needed] They can be recognized by a red ring around the front part of the lens. Most recent L lenses have sealing to help resist dust and water. L-lenses are typically used by professionals and serious amateurs due to their high price and large mass.

Most L series lenses share a number of common characteristics:

Tough build, made to withstand the trials on the fields (some incorporating dust and moisture resistant rubber seals).

At least one fluorite or ultra-low dispersion glass element, combined with super-low dispersion glass and ground aspherical elements.

Non-rotating front elements, which are optimal for some filters (e.g. circular polarizers).

Relatively large apertures compared to other Canon lenses in the same focal lengths.

Where included, true ring-type USM (ultrasonic motor) and full-time manual focusing.

Three additional data communication pins on Canon Extender EF compatible lenses, compared to the standard EF mount.

There are some lenses which include one or more of these technologies but which are not designated L-lenses. L-lenses are often equipped with USM and/or IS, but the optical performance is the key criterion.

Larger sized L-lenses, such as the 70-200mm and 100-400mm zooms and longer focal length primes (300mm+), usually have an off-white barrel (sometimes referred to as the color "putty") to reduce heat absorption under the sun that may otherwise affect the performance of the lens, as well as to identify Canon's lenses (for example at sporting events). However, shorter focal length L-lenses can be black (such as the Canon EF 24-70mm f/2.8L and all L-lens primes under 300mm, with the exception of the discontinued 200mm f/1.8L and newly announced 200mm f/2.0L IS.). Therefore L-lenses can be identified by either a Lens Barrel's off-white colour or, as on all L-lenses, the distinctive red ring on the lens barrel.

A Gelatin Filter holder, on the rear of an EF lens.

Wide angle L-lenses typically have a gelatin filter holder on the mounting point of the lens, which allows the photographer to cut a small, square piece of gelatin out of a larger filter sheet and place it on the lens. On film cameras, these are typically used to correct the color temperature, but on digital cameras this is largely unnecessary, as the color temperature can be corrected in software. The mount is still commonly used for neutral density gelatin sheets though, especially on certain wide-angle lenses where the protruding front element precludes the use of any screw-in filters. Some telephoto L-lenses, such as the EF 70-200mm zoom lenses, or the EF 300mm f/4L IS USM do not have rear gelatin filter holders. Super-telephoto lenses such as the EF 500mm f/4L IS USM, or the EF 200mm f/2L IS USM do have a rear 52mm drop-in filter holder, than can be used to hold gelatin type filters.

Lenses

The following is a list of L-lenses including discontinued lenses.

Zoom

Ultra-wide-angle

16-35mm f/2.8L USM (Discontinued)

16-35mm f/2.8L II USM

17-35mm f/2.8L USM (Discontinued)

17-40mm f/4.0L USM

20-35mm f/2.8L (Discontinued)

Standard

24-70mm f/2.8L USM

24-105mm f/4.0L IS USM

28-70mm f/2.8L USM (Discontinued)

28-80mm f/2.8-4.0L USM (Discontinued)

Telephoto

28-300mm f/3.5-5.6L IS USM

35-350mm f/3.5-5.6L USM (Discontinued)

50-200mm f/3.5-4.5L (Discontinued)

70-200mm f/4.0L USM

70-200mm f/4.0L IS USM

70-200mm f/2.8L USM

70-200mm f/2.8L IS USM

70-200mm f/2.8L IS II USM

80-200mm f/2.8L (Discontinued)

100-300mm f/5.6L (Discontinued)

100-400mm f/4.5-5.6L IS USM

Prime

Wide-angle

14mm f/2.8L USM (Discontinued)

14mm f/2.8L II USM

24mm f/1.4L USM (Discontinued)

24mm f/1.4L II USM

35mm f/1.4L USM

Standard & medium telephoto

50mm f/1.0L USM (Discontinued)

50mm f/1.2L USM

85mm f/1.2L USM (Discontinued)

85mm f/1.2L II USM

Telephoto

135mm f/2.0L USM

200mm f/1.8L USM (Discontinued)

200mm f/2.0L IS USM

200mm f/2.8L USM (Discontinued)

200mm f/2.8L II USM

300mm f/2.8L USM (Discontinued)

300mm f/2.8L IS USM

300mm f/4.0L USM (Discontinued)

300mm f/4.0L IS USM

Super telephoto

400mm f/2.8L USM (Discontinued)

400mm f/2.8L II USM (Discontinued)

400mm f/2.8L IS USM

400mm f/5.6L USM

500mm f/4.5L USM (Discontinued)

500mm f/4.0L IS USM

600mm f/4.0L USM (Discontinued)

600mm f/4.0L IS USM

800mm f/5.6L IS USM

1200mm f/5.6L USM (special order only)

Macros

100mm f/2.8L Macro IS USM

180mm f/3.5L Macro USM

Tilt-shift

17mm f/4.0L Tilt-Shift

24mm f/3.5L Tilt-Shift

24mm f/3.5L II Tilt-Shift

Canon Lens codes

On the back of Canon lenses is a six-digit code, which indicates where the lens was manufactured and when.

Example of a code "UV1212"

The first letter 'U' represents the factory that made the lens. Three possible first letters are:

U = Utsunomiya

F = Fukushima

O = ita

The second letter 'V' represent the year of manufacture

A = 1986, 1960

B = 1987, 1961

C = 1988, 1962

D = 1989, 1963

E = 1990, 1964

F = 1991, 1965

G = 1992, 1966

H = 1993, 1967

I = 1994, 1968

J = 1995, 1969

K = 1996, 1970

L = 1997, 1971

M = 1998, 1972

N = 1999, 1973

O = 2000, 1974

P = 2001, 1975

Q = 2002, 1976

R = 2003, 1977

S = 2004, 1978

T = 2005, 1979

U = 2006, 1980

V = 2007, 1981

W = 2008, 1982

X = 2009, 1983

Y = 2010, 1984

Z = 2011, 1985

The next two digits represent the month of the lens is manufactured.

The last two digits are for internal Canon use.

Therefore the example of UV1212 means the lens was made in the Utsunomiya, Japan factory in December 2007.

See also

Canon EF lens mount

References

^ http://software.canon-europe.com/files/documents/EF_Lens_Work_Book_2_EN.pdf

^ Canon EF Lens Work Book 2, page 15)

External links

At the-digital-picture.com:

Canon L Lens Series Information

Categories: Canon L-Series lensesHidden categories: Articles with weasel words from March 2009 | All articles with unsourced statements | Articles with unsourced statements from November 2009

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Article Source: http://www.earticlesonline.com/Article/Canon-L-Lens/885730

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i have seen in many videos that a sump contains filter bags, bio balls, sump block and a protein skimmer.i want to add 3 more filter media to it, ammonia, active carbon and ceramic ring filter.

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