Tamron has announced what it claims to be the world’s first 85 mm f/1.8 lens with VC for full-frame DSLR cameras, offering the “ultimate correction” of aberrations and excellent resolving power with balanced bokeh. The new 90 mm lens is a macro, also with VC (vibration compensation).
The SP 85 mm f/1.8 Di VC USD, to use its full name, uses LD (Low Dispersion) and XLD (Extra Low Dispersion) glass elements. Tamron says these elements have “virtually eliminated” on-axis and lateral chromatic aberrations that might otherwise appear as colour fringing. In addition, by thoroughly reducing comatic aberrations (distortion of off-axis point source) and astigmatism, subjects that appear as a distinct point source will be captured as a distinct point source even at the edges and corners of the frame, says the company.
Optical construction is 13 elements in 9 groups.
Two highly developed lens coating technologies, eBAND (Extended Bandwidth & Angular-Dependency) which uses nanotechnology, and BBAR (Broad-Band Anti-Reflection), combine to increase light transmission and to reduce flare and ghosting to “imperceptible levels.” Additional techniques are employed to prevent reflections inside the lens barrel so that the lens delivers high contrast, sharp and clear images. Tamron says this lens clearly captures detailed tones even in the shadows.
In addition, moisture-resistant construction is said to prevent intrusion of moisture, and a highly durable fluorine coating has been applied to the top element surface to prevent condensation and repel smudge-causing substances.
An electromagnetic diaphragm system, which has been a standard feature for Canon-mount lenses, is now employed in Nikon-mount lenses. More precise diaphragm and aperture control is possible because the diaphragm blades are driven and controlled by a motor through electronic pulse signals.
Fast, quiet AF is achieved by employing a USD (Ultrasonic Silent Drive) ring-type ultrasonic motor which enables remarkably precise focusing drive with high torque and responsiveness. Thanks to the absence of reduction gears in USD, there is no backlash and no unnecessary back-and-forth movement. The control software program for the USD actuator has been revised to provide substantially improved focusing speed and accuracy when using AF. In addition, Full-time Manual Focus override is available at any point during the autofocus operation for deliberately shifting focus without switching the AF-MF. Whether overriding the autofocus or focusing completely manually, the focusing ring turns smoothly and evenly.
You can update firmware, customize autofocus positions and adjust the mechanical setup and preferences of the lens by attaching it to the new TAP-in Console and connecting it via USB to a personal computer. (The TAP-in Console is an optional accessory.)
Supplied with SILKYPIX Developer Studio 4.0, editing software that features correction menus for various aberrations (lateral colour, distortion, relative illumination) based on the optical design data of this specific lens. In addition, lens profile information has been supplied to Adobe to facilitate selecting the precise lens data required for more sophisticated adjustments in RAW processing when using Adobe Photoshop and Lightroom.
Tamron’s SP 90 mm f//2.8 Macro 1:1 Di VC USD is an upgrade of the company’s previous 90 mm macro lens. XY-Shift compensation has been added to reinforce VC functionality, further improving image stabilization from infinity to macro. Advancements in USD control software have also increased AF focusing speed, and optimally fine-tuned for various framing conditions. In addition, a high standard of moisture-proof and dust-resistant construction has been added to prevent intrusion of dust or moisture, and a highly durable fluorine coating has been applied to the top element surface to prevent condensation and repel smudge-causing substances.
Inheriting the optical design of the previous 90 mm macro (14 elements in 11 groups), the new model is said to deliver the same resolving power and soft background blur effects. The advanced construction includes one LD (Low Dispersion) specialized glass element that maximally limits the dispersion properties of light and two XLD (eXtra Low Dispersion) glass elements to correct dispersion properties to an even greater extent. The special elements optimally compensate for on-axis and lateral chromatic aberrations from macro shooting range to infinity. The company says the design ensures the best imaging performance at any range by adopting the Floating System which shifts the location of a group of elements to the best possible position as the focusing group travels relative to shooting distances.
Tamron also notes it hasn’t altered the lens’ blur effects; the company says the lens achieves both sharp, vivid images and spectacular background blur effects.
An accelerometer has been integrated into the VC to compensate for shakes on the x-y plane. In unison with a gyro sensor, the accelerometer detects and enables motion compensation for camera shake, providing maximum efficiency in image stabilization optimized for all distance ranges from infinity to macro.
The control software program for the USD (Ultrasonic Silent Drive) actuator has been revised to provide substantially improved focusing speed and accuracy when using AF. The USD quickly addresses any out-of-focus condition caused by back-and-forth camera movement (which commonly occurs during macro photography) ensuring better results when shooting at close range.
The water and oil repellant coating applied to the front element surface allows instant removal of dirt or smudges with ease. The coating also provides a reasonable level of durability, and will sustain its effectiveness for years.
Two advanced coating technologies, both providing outstanding anti-reflection performance, are applied to critical element surfaces for maximum light transmission – eBAND (Extended Bandwidth & Angular-Dependency) Coating boasts outstanding anti-reflection performance across nearly the entire range of visible rays, and BBAR (Broad-Band Anti-Reflection) Coating utilizes traditional multi-layered, anti-reflection technology. This combination, says the company, “virtually eliminates” extraneous reflections and substantially reduces ghosting and flare which enables the lens to achieve flawless, crystal clear images.
The new 90 mm macro has a focus limiter that makes it possible to shorten the time for accurately focusing on a subject when the working range is known. The lens also features an internal focusing system, so the overall length of the lens never changes, not even when focusing. As a result, the user is assured of a comfortable working distance of at least 139 mm (5.5 in.) from the front of the lens. In addition, the lens is equipped with a full-time manual focus override mechanism which makes it possible to flexibly choose focal points. Even with the AF driving system in action, it is possible to instantaneously override it to make manual fine focusing adjustments without switching the AF-MF mode back and forth.
As with the 85 mm noted above, you can update firmware, customize autofocus positions and adjust the mechanical setup and preferences of the 90mm lens by simply attaching it to the TAP-in Console (an optional accessory).
Included in the package is SILKYPIX Developer Studio, and lens profile information has been supplied to Adobe.
The Tamron SP 85 mm f/1.8 Di VC USD is scheduled for launch late in March in Canon and Nikon versions, with the Sony (non-VC) version coming later.
The SP 90 mm f//2.8 Macro 1:1 Di VC USD is scheduled for almost immediate availability in Nikon and Canon versions, with the Sony (non-VC) model coming later.