![]() The port has a 67 mm threaded front for attachment of filters and diopter lenses. But you can use MTF charts as a scale to measure lens performance.I have a Meikon a7RII housing with a port for the Sony 90 mm f2.8 macro lens. 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. ![]() 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. MTF (Modulation Transfer Function) curves describe to what extent the tested lens can faithfully reproduce contrast of the subject in images it captures. The arrival of the SP 90mm F/2.8 Di MACRO 1:1 VC USD (Model F017), renewed by vast improvements in performance and design, is destined to mark a new chapter in the history of Tamron’s 90mm macro lenses. It even adopted the tagline, “the portrait macro lens”, which came to be widely propagated with time. Since then, the macro lens has become highly valued by professional and amateur photographers alike for its wide-range of use in situations that were once considered unimaginable, as it gained popularity in portrait photography. The general perception of appropriate use for a macro lens back then was for its close-ups, especially in the professional world, such as for documenting minute details for academic purposes and storing photographs for documentary records.Īgainst this historical backdrop, Tamron released its first-generation 90mm macro lens and succeeded in breaking away from convention and creating new value for the modern macro lens – by balancing highly refined, depictive quality in photographic images with remarkably beautiful bokeh. The SP 90mm F/2.5 (Model 52B) was Tamron’s first 90mm macro lens released in 1979. The user can feel it in the exquisitely smooth texture of the metallic barrel. Meticulous craftsmanship is demonstrated in every detail of the exterior design of the newly transformed SP 90mm macro lens. Highly durable, Fluorine Coating is applied to the top element surface and efficiently prevents condensation of moisture and repels smudge-causing substances. Furthermore, a high standard of Moisture-Proof and Dust-Resistant Construction has been added to prevent intrusion of dust or water droplets. Advancements in USD control software have also increased AF focusing speed and optimally fine-tuned for various framing conditions. XY-Shift compensation has been newly added to reinforce VC functionality, further improving image stabilization capabilities at any shooting distance from infinity to macro. It redefines the best in advanced features and succeeds a legacy of superior optical performance. The SP 90mm F/2.8 MACRO VC (Model F017) is the most recent release in a successful line of Tamron SP 90mm macro lenses. A New Chapter in the Distinguished History of Tamron’s 90mm Macro LensesĪ Legacy of Superior Optical Performance Now Reaches a New Plateau with Enhanced VC Functionality and Advanced Features
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