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Objektivskolan - Ordlista - RF (Sigma)

 
Förkortningen betyder
RF = Rear Focus
 
 
Förklaring från Sigma
This lens is equipped with a system that moves the rear lens group for highspeed, silent focusing.

Conventional focusing has normallybeen performed by moving either all lens groups as a fixed unit or onlythe first lens group. AF cameras are now widely used, even for close-upphotography. Consequently, demand has arisen for a focusing system thatwill keep the length of the lens unchanged while showing little fluctuationof aberration. In response to this demand, SIGMA has developed a newinner focus system that moves two lens groups inside the telephoto andtelephoto MACRO lenses. This system has floating elements thatsubstantially improve the close-upcapability of the lens. The superwide angle lens having a large front-lens uses a rear focusing system tomove the rear-lens apparatus andenhance the floating effect, and the18-200mm F3.5-6.3 DC features aninner focusing system to move thesecondary lens group duringfocusing. This lens has a minimumfocusing distance of 45 cm / 17.7inch throughout entire zoom range.The rear focus system ensures high-speed focusing with the wide lens20mm F1.8 EX DG ASPHERICALRF.
 
 
Se exempel på berörda produkter
Sigma EX 20mm f/1,8 DG ASP RF
 
Se länkar
sigmaphoto.com
sigma-photo.co.jp




Objektiv för Canon
Nedan visas några populära alternativ (se alla)
Sigma 18-200mm f/3,5-6,3 DC OS Sigma 18-200mm f/3,5-6,3 DC OS
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Canon EF 70-300mm f/4,5-5,6 DO IS USM Canon EF 70-300mm f/4,5-5,6 DO IS USM
Canon EF 500mm f/4 L IS USM Canon EF 500mm f/4 L IS USM
 
 

Objektiv för Nikon
Nedan visas några populära alternativ (se alla)
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Sigma EX 150mm f/2,8 DG OS HSM APO Macro Sigma EX 150mm f/2,8 DG OS HSM APO Macro
Nikon AF-S 50mm f/1,8 G Nikon AF-S 50mm f/1,8 G
Tamron SP AF 17-50mm f/2,8 XR Di-II LD IF (motorized) Tamron SP AF 17-50mm f/2,8 XR Di-II LD IF (motorized)
 
 

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

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Två populära objektiv du inte får missa
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