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LD = Low Dispersion

Förklaring från Tamron

Low Dispersion (LD) Glass for Greater Lens Sharpness
Low dispersion (LD) glass elements in a lens help reduce chromatic aberration; the tendency of light of different colors to come to different points of focus at the image plane. Chromatic aberration reduces the sharpness of an image, but glass with an extremely lowdispersion index, has less of a tendency to separate (defract) a ray of light into a rainbow of colors. This characteristic allows the lens designer to effectively compensate for chromatic aberration at the center of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (towards the edges of the field) that often occurs at short focal lengths (the wide-angle end of the zoom range.)

Se exempel på berörda produkter

	Tamron SP AF 17-50mm f/2,8 XR Di-II LD Asph IF
	Tamron SP AF 180mm f/3,5 Di LD IF Macro
	Tamron AF 55-200mm f/4-5.6 Di II LD Macro

Se länkar

tamron-usa.com

Objektiv för Canon
Nedan visas några populära alternativ (se alla)
	Sigma EX 70-200mm f/2,8 II APO HSM DG Macro
	Tamron AF 28-300mm f/3,5-6,3 XR Di VC
	Canon EF 800mm f/5,6 L IS USM
	Canon EF 15mm f/2,8 Fisheye

Objektiv för Nikon
Nedan visas några populära alternativ (se alla)
	Tokina AT-X DX 10-17mm f/3,5-4,5 Fisheye
	Sigma 18-125mm f/3,8-5,6 DC OS HSM
	Nikon AF-S 400mm f/2,8 G ED VR
	Nikon AF-S DX 55-200mm f/4-5,6 G ED VR

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