Objektivskolan - Ordlista - IF (Tokina)

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IF = Internal Focus System

Förklaring från Tokina

The two most used methods of focusing a lens are either the complete straight forward movement of lens elements (used mainly with single focal length lenses) or the rotation of the entire lens barrel group (used mainly with zoom lenses). The internal focusing system used by Tokina move each element group within the lens, but does not change the overall length of the lens. This is especially useful with telephoto designs.

The internal focusing system has a number of advantages including;

1. Faster focusing
2. Improved handling due to fewer movements near the center of gravity
3. More compact lens designs
4. Superior use of filters because the barrel with the filter thread does not rotate.

IFS (Internal Focus System)
By movement of the forward elements within the stationary main barrel: AT-X 235 AF PRO, AT-X 287 AF PRO SV, AT-X 280 AF PRO, AT-X 828 AF PRO

Se exempel på berörda produkter

Tokina AT-X Pro 16-50mm f/2,8 DX

Se länkar

tokinalens.com

Objektiv för Canon
Nedan visas några populära alternativ (se alla)
	Canon EF 70-300mm f/4,5-5,6 DO IS USM
	Tamron SP AF 90mm f/2,8 Di Macro
	Tokina AT-X Pro 16-50mm f/2,8 DX
	Sigma EX 200-500mm f/2,8 APO HSM DG

Objektiv för Nikon
Nedan visas några populära alternativ (se alla)
	Tamron SP AF 17-50mm f/2,8 XR Di-II LD IF VC
	Nikon AF-S 300mm f/2,8 G IF-ED VR II
	Nikon AF 35mm f/2 D
	Nikon PC-E 85mm f/2,8 D ED

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