Objektivskolan - Ordlista - USD (Tamron)

 
Förkortningen betyder
USD = Ultra Sonic Drive
 
 
Förklaring från Tamron
Tamron’s USD works with the high-frequency ultrasonic vibrations that are produced by a ring called a ‘stator’. Energy from the vibrations is used to rotate an attached metallic ring known as the ‘rotor’. Piezoelectric ceramic, an element that produces ultrasonic vibrations when voltage of a specific frequency is applied is arranged in a ring formation on the stator. This electrode configuration of piezoelectric ceramic causes two ultrasonic vibrations to occur in the stator.
By effectively combining these two ultrasonic vibrations, it is possible to convert the energy from the vibrations that produced simple motion into energy known as ‘deflective traveling waves’, which then moves around the circumference (rotation direction) of the ring.
With the USD, the friction between these deflective traveling waves created on the metallic surface of the stator and the surface of the rotor produce force, causing the rotor to rotate. The focusing ring lens, which is linked to the rotor, is thus moved, creating a fast and smooth auto-focus drive.
 
Se länkar
tamron-usa.com




Objektiv för Canon
Nedan visas några populära alternativ (se alla)
Sigma EX 8mm f/3,5 DG Fisheye Sigma EX 8mm f/3,5 DG Fisheye
Canon EF 17-40mm f/4 L USM Canon EF 17-40mm f/4 L USM
Canon EF 70-300mm f/4,5-5,6 DO IS USM Canon EF 70-300mm f/4,5-5,6 DO IS USM
Sigma EX 105mm f/2,8 DG Macro Sigma EX 105mm f/2,8 DG Macro
 
 

Objektiv för Nikon
Nedan visas några populära alternativ (se alla)
Sigma EX 4,5mm f/2,8 DC HSM Fisheye Sigma EX 4,5mm f/2,8 DC HSM Fisheye
Nikon AF-S 85mm f/1,8 G Nikon AF-S 85mm f/1,8 G
Nikon AF-S 16-35mm f/4 G ED VR Nikon AF-S 16-35mm f/4 G ED VR
Nikon AF-S 600mm f/4 G ED VR Nikon AF-S 600mm f/4 G ED VR
 
 

Objektivskolan
Våra artiklar utbildar dig (se alla)
Se bilder tagna med ett visst bländartal
Att rengöra ett objektiv
Skydda ditt objektiv med ett filter
Kameran kan påverka brännvidd
Se objektiv för just din kamera
Nedan visas några modeller (se alla)
Nikon D90
Canon EOS 60D
Canon EOS 600D
Canon EOS 400D

Nyheter
Nikon AF-S 600mm f/4 E FL ED VR

Nikon AF-S 600mm f/4 E FL ED VR
Nikon AF-S 500mm f/4 E FL ED VR

Nikon AF-S 500mm f/4 E FL ED VR

Två populära objektiv du inte får missa
Nikon AF-S 500mm f/4 D IF-ED II

Nikon AF-S 500mm f/4 D IF-ED II
Canon EF 16-35mm f/2,8 L USM

Canon EF 16-35mm f/2,8 L USM

Senast besökta objektiv
Canon EF 75-300mm f/4-5,6 III USM

Canon EF 75-300mm f/4-5,6 III USM
Sigma EX 180mm f/3,5 HSM DG Macro

Sigma EX 180mm f/3,5 HSM DG Macro

Senast besökta kameror
Nikon D500

Nikon D500
Nikon D2X

Nikon D2X
Nikon D90

Nikon D90








Copyright © Objektivguiden 2020 Om Objektivguiden