But you can use MTF charts as a scale to measure lens performance. There are other factors that are expressed in different methods, such as taste of softness and degrees of compensation of various aberrations. Performance characteristics of photographic lenses cannot be expressed with only MTF charts. When sharp lenses capable of delivering uniform optical performance over the entire image field are tested, MTF charts show curves plotted in good balance. Solid lines show performance in the sagittal (radial) direction while dotted lines indicate performance in the meridional (circumferential) direction. Lens performance differs depending upon directions. The closer the 30 lp/mm curve (the thin line for high frequency) to "1" (the higher up), the higher the resolving power and thus the subjective sharpness of the lens will be. Nikon 20 mm f/2.8 AI-S, Nikon Nikkor-H 85mm f1.8 (diffuse. The closer the 10 lp/mm (line pairs per millimeter) curve (the thick line for low frequency) in an MTF chart to "1" of the vertical axis (the higher up), the higher the contrast reproduction performance of the tested lens will be. Nikon 18-200mm f/3.5-5.6 G ED-IF AF-S VR DX, Nikon 70-210 mm f/4-5.6 AF-D (starting at f8). MTF (Modulation Transfer Function) curves describe to what extent the tested lens can faithfully reproduce contrast of the subject in images it captures. Looking to buy new Tamron lenses, such as the B018? Find a dealer near you and see why the B018 by Tamron is such a good choice for new and experienced photographers alike. It’s the world’s lightest zoom lens in the 18-200mm class. In fact, the B018 weighs in at a feather-light 14.1 oz, thanks to a design that incorporates high-durability engineering resin and other composite components. With features like high-performance autofocus (AF) drive module that provides faster, quieter, and more precise shots, vibration compensation (VC) that helps eliminate camera shake and stabilizes images, and moisture-resistant design for outdoor shooting in all conditions, the B018 can do it all – in a single lightweight, compact zoom lens. Whether you’re shooting a birthday party, taking photos on a hike, touring your favorite city, or taking a portrait of a friend or family member, the B018 18-200mm VC is a fantastic choice. Opremljen je z Nikonovim sistemom za stabilizacijo slike in edinstvenim tihim pogonom SWM ter zagotavlja odlino zmogljivost v slabih svetlobnih pogojih s prenosom enakomerne slike v senzor in iskalo, samodejno ostrenje pa je hitro in tiho. This powerhouse covers a wide variety of focal lengths from 18 to 200mm, providing photographers with the ability to take amazing shots in a wide variety of situations. Priljubljeni vsestranski objektiv formata DX z 11,1-kratno poveavo. And the B018 from Tamron is an ideal choice for anyone who is interested in upgrading from the basic starter lens sold with their camera. Tamron 18-200 F/3.5-6.3 Di II VC - Canon, Nikon & Sony Mounts Unparalleled Quality, Unlimited OpportunitiesĪs a leading camera lens manufacturer, Tamron is always looking to provide new photographers with the high-quality equipment they need for a reasonable price.
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