SIGMA 45mm F2.8
DG DN | Contemporary
• Conception robuste
• Bokeh et rendu hors normes
• Diaphragme arrondi
• Étanche à la poussière et aux éclaboussures
• AF rapide avec mise au point constante
| Ligne | Contemporary |
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| Klevu Image | /p/r/product_img01_9_1.png |
| Formule optique | 8 Elements in 7 Groups |
| Lens Type | Standard |
| Sensor Size | Full Frame |
| Angle de vue | 51.3º |
| Diaphragme | 7 (Rounded Diaphragm) |
| Ouverture minimale | F22 |
| Distance minimale de mise au point | 24 cm |
| Rapport de reproduction maximal | 1:4 |
| Dimensions (diameter x length) | Sony E-mount ⌀ 64.0 mm x 48.2 mm |
| Diamètre de filtre | 55mm |
| Edition number | C019 |
| Accessoires | Lens Hood (LH577-01) supplied |
| EAN | L-Mount 085126360696 |
LENS CONSTRUCTION
GEOMETRICAL MTF Chart
DIFFRACTION MTF CHART
Focus Mode Switch
Using this swich, it is possible to switch the focus mode between AF and MF.
Linear focus / Non-linear focus (for L-Mount only）
A focus movement method of interchangeable lenses for mirrorless cameras (DN lens) in relation to the rotational angle of the focus ring during manual focusing.
With "non-linear focus," the amount of focal point movement varies depending on the focus ring rotational speed.
With linear focus, if the focus ring rotational angle is the same, the amount of focal point movement remains the same regardless of the focus ring rotational speed.
High-precision, rugged brass bayonet mount
The brass mount combines high precision with rugged construction. Its treated surfaces and enhanced strength contribute to the exceptional durability of the lens.
Rounded diaphragm
Exclusive low-dispersion glass
Exclusive low-dispersion glass
The degree to which light is refracted by glass depends on the light's wavelength. This fact causes different colors of light to focus at slightly different points. The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. Yet residual chromatic aberration known as "secondary spectrum" may still remain. To minimize this secondary spectrum, which can be a serious issue with conventional lenses, SIGMA lenses feature up to three types of exclusive low-dispersion glass offering superior performance: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD ("F" Low Dispersion). In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. Meticulous deployment of these types of exclusive low-dispersion glass and optimization of power distribution gives SIGMA lenses superlative image rendition undiminished by residual chromatic aberration.
Lens construction: 8 elements in 7 groups (2 aspherical lenses)
Compatible with high-speed autofocus
Support for DMF, AF + MF
Lens Hood
Compatible with SIGMA USB DOCK UD-11 (sold separately; L-Mount only)
Designed to minimize flare and ghosting
7-blade rounded diaphragm
High-precision, durable brass bayonet mount
