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Zoom lens that designed to suit the characteristics of digital cameras
Exclusively designed to suit the characteristics of digital SLR cameras. The image circle was designed to match the size of the image sensors of most digital SLR cameras and this has resulted in a compact lightweight lens. The use of aspherical lenses provides correction for various aberrations and makes high quality images a reality throughout the entire zoom range. The Nikon fit version also includes an HSM auto focus motor
Compact-Lightweight zoom lens has a maximum diameter of 62mm overall length of 67.5mm and weight of only 250gr and filter size of 58mm. Compact dimensions offers superb handling and mobility. The use of aspherical lenses provides correction for various aberrations throughout the entire zoom range and produce high level of optical performance.
We took digital characteristics into consideration when designing the lens power layout and created the most suitable lens that makes high quality images a reality throughout the entire zoom range. We used the most appropriate coating for digital products to cut down flare and ghost caused by digital SLR cameras and to produce the best color balance. It can be used with the supplied lens hood to block out extraneous light.
18-50mm F3.5-5.6 DC zoom lens has a minimum focusing distance of 25cm (9.8in.) at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.5. The focus ring provides easy operation in manual mode. A distance scale on the focus ring is an easy to use and convenient addi -
Lens elements 8 Lens groups 8 Optic angle in degrees (35mm) - Optic angle in degrees (SD format mm) 69.3-27.9 Number of diaphragm blades 7 Smallest diaphragm 22 Largest diaphragm 3.5-5.6 Shortest focus distance (cm) 25 Maximum enlargement 1:3.5 Filter size 58 Diameter (mm) 67.5 Length (mm) 62 Weight (g) 250 Zonnekap Yes Statiefgondel No Case No Converter No Mount Canon, Fuji, Konica/Minolta, Nikon, Olympus, Pentax, Sigma, Sony Barcode(s) - Canon (0085126521271)
- FT (0085126521585)
- Nikon (0085126521554)
- Pentax (0085126521455)
- Sigma (0085126521400)
- Sony (0085126521349)
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MTF (Modulation Transfer Function; modulatieoverdrachtsfunctie) is een van de metingen die worden verricht om de optische prestaties van een objectief te bepalen. Men meet hiertoe het beeldcontrast bij verschillende ruimtelijke frequenties (lijnparen per millimeter).De horizontale as is verdeeld in millimeters en toont de afstand van het midden tot de rand van het beeld. De bijbehorende contrastwaarde (maximaal 1) is uitgezet op de verticale as.
De waarde bij 10 lijnparen per millimeter geeft het objectiefcontrast aan (rode lijntjes). De zich herhalende fijne parallelle lijnen bij 30 lijnparen per millimeter geven het scheidend vermogen (scherpte) van het objectief bij de volle opening aan.
De zich herhalende fijne parallelle lijnen die in de diagonale richting van de ene naar de andere hoek van het beeld lopen worden Sagittale lijnparen (S) genoemd. De lijnen die daar loodrecht op staan worden Tangentiale lijnparen (T) genoemd. -
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