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18-50mm f / 2.8 EX DC Macro; Maker: Sigma Corporation: Technical data; Focal length: 18-50mm: Aperture (max/min) f / 2.8 – f / 22: Close focus distance: 28cm/11 in. Max. magnification: 1:3: Diaphragm blades: 7: Construction: 15 elements in 13 groups: Features; Short back focus No: Lens-based stabilization No: Macro capable Yes: Application ...
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
The lens has an EF mount and works with EOS film and digital cameras. The lens comes in two different versions: Canon EF 70–210mm f/4 AFD (1987–1990) Canon EF 70–210mm f/3.5–4.5 USM (introduced 1990) The variable-aperture USM model utilizes a rotating ring instead of a push-pull system for adjusting zoom. The lens was superseded by the ...
Macro photograph of a common yellow dung fly ( Scathophaga stercoraria) made using a lens at its maximum 1:1 reproduction ratio, and an 18×24mm image sensor, the on-screen display of the photograph results in a greater than life-size image. Headshot of a dragonfly taken with a 100 mm macro lens coupled with a 50 mm lens in reverse at the end.
Canon EF 24–70mm f/2.8L lens with hood (EW-83F) The Canon EF 24–70mm lens is a family of professional EF mount wide -to- normal zoom lenses manufactured and sold by Canon. The first of the family, the EF 24–70mm f/2.8L, was introduced in 2002 to replace the well-regarded 28–70mm f/2.8L. Two later versions were announced in 2012.
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.
The EF 100–300mm refers to three telephoto zoom lenses produced by Canon. They are of the EF lens mount that is compatible with the EOS line of cameras. The three versions are: f/ 5.6. f/ 5.6L. f/ 4.5–5.6 USM. The two 5.6 versions were contemporaries, launched at the beginning of the Canon EOS system. The L version had a different optical ...
Zoom: Focal length: 70–300mm: Aperture (max/min) f/4 – f/5.6: Close focus distance: 150cm / (95cm Macro mode) Max. magnification: 1:4.1 / 1:2(Macro mode) Diaphragm blades: 9: Construction: 14 elements in 10 groups: Features; Short back focus No: Ultrasonic motor No: Lens-based stabilization No: Macro capable Yes: Application: Consumer ...
Tilt-lens photo of a model train. Note how the focus plane is along the train, and how the blurring of the background proceeds from left to right. Tilt–shift photography is the use of camera movements that change the orientation or position of the lens with respect to the film or image sensor on cameras .
The Micro Four Thirds system cameras and lenses perform automatic distortion correction using correction parameters that are stored in each lens's firmware, and are applied automatically by the camera and raw converter software. The optics of most of these lenses feature substantially more distortion than their counterparts in systems that do ...