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Optical design
| Format: 35mm SLR
Type: Zoom lens
Focusing: Auto Focus (AF)
Lens mounts: Canon EF, EF-S, Canon EF, EF-S, Konica AR, Konica AR, Nikon F (FX, DX), Nikon F (FX, DX), Pentax K, Pentax K, Sigma SA, Sigma SA, Minolta SR (MD, MC), Minolta SR (MD, MC)
Optical design: 16 elements in 15 groups
| User reviews (0) Photos (0) Tests (0) Owners (3) Views (8361) Average price: $600 |
Specifications:
| Focal length | Max. aperture | Min. aperture | Blades | Min. Focus (m.) | Filter Ø (mm.) | Weight (gr/oz) | Length (mm/in) |
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| 24mm - 135mm | f/2.8 - f/4.5 | f/32 | 9 | 0.5 | 77 | 530/18,7 | 90.9/3,6 |
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Additional information:
The Sigma AF 24-135 mm f/ 2.8-4.5 Aspherical IF is an all-purpose zoom lens for 35 mm SLR cameras of popular systems.
This is a rare lens of a Sigma discontinued line.
The image has a certain soft-effect when wide open, but it gets sharper on stopping down one or two f-stops.
The Sigma AF 24-135 mm f/ 2.8-4.5 Aspherical IF has a characteristic feature: its resolution increases when converted from wide-angle to telephoto.
The optical scheme consists of one SLD element and two aspherical lenses for correction of all aberrations.
The lens casing is made of brass, and the bayonet mount is chromium-plated.
The focusing of the Sigma AF 24-135mm f/2.8-4.5 Aspherical IF is internal and rather fast; the front lens does not rotate on focusing and zooming, which is convenient for the use of polarized filters. The lens barrel extends too much on zooming, and a little on focusing.
Links to online resources:
Posted by: dr_Teller Date of publication: 09.04.2012
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