The 45mm format is the closest approximation to human field of vision and captures high-resolution shots to an unparalleled degree of resolving power. Furthermore, the integration of VC into a 45mm fast standard prime lens for full-frame DSLR cameras is an industry-first*.
* As of July 2015. Source: Tamron.
Compose an image at will, without regard to shooting distance or ambient lighting constraints – to produce crisp, tack sharp images from F/1.8 full open aperture. The unique synthesis of a VC system in a 45mm lens with a best-in-class MOD of 0.29m** redefines standard distance shooting – freeing the photographer to discover another dimension of personal style.
** Rated top among current 45mm and 50mm fixed focal length interchangeable AF lenses for full-frame DSLR cameras excluding macro lenses (As of July 2015. Source: Tamron).
The open aperture is set to F/1.8 with optimized critical properties at a higher level: superb optical performance coupled with a VC system, a shorter MOD, and a well-balanced form factor. Rigorous simulation processes performed throughout the design phase are materialized in distinguished resolving power and beautifully-tuned background blur, a prominent feature to a fast-aperture, full-frame compliant optic.
The SP 45mm (MOD: 0.29m) offers best-in-class close focusing*.
A floating system design feature seamlessly optimizes image quality by shifting elements relative to the focus group in close shooting situations.
* 45mm: Rated top among current 45mm and 50mm fixed focal length interchangeable AF lenses for full-frame DSLR cameras excluding macro lenses (As of July 2015. Source: Tamron).
VC deployed on fast-aperture lenses dramatically enhances freedom of hand-held shooting under lime light or dim room light conditions by eliminating minute camera shake. In particular, cameras with high-pixel density imagers tend to pick up subtle vibrations, resulting in degradation of image quality.
VC is an excellent attribute to acquire inherent high-fidelity images. 45mm is the very first lens that employs the VC functionality among the fast standard fixed focal lenses in full-frame format.*
* As of July 2015. Source: Tamron.
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|Angle of View (diagonal)||
51°21’ for full-frame format
34°28’ for APS-C format
|Optical Construction||10 elements in 8 groups|
|Minimum Object Distance||0.29m (11.4 in)|
|Maximum Magnification Ratio||1:3.4|
91.7mm (3.6 in) Canon
89.2mm (3.5 in) Nikon
91.6mm (3.6 in) Sony
540g (19 oz) Canon
520g (18.3 oz) Nikon
515g (18.2 oz) Sony
|Aperture Blades||9 (circular diaphragm**)|
|Image Stabilization Performance||
3.5 Stops (CIPA Standards Compliant)
For Canon : EOS-5D MarkIII is used / For Nikon : D610 is used
|Standard Accessories||Flower-shaped lens hood, Lens caps|
|Compatible Mounts||Canon EF mount, Nikon, Sony A-mount***|
Specifications, appearance, functionality, etc. are subject to change without prior notice.
* Length is the distance from the front tip of the lens to the lens mount face.
** The circular diaphragm stays almost perfectly circular up to two stops down from maximum aperture.
*** Sony mount model without VC.
September 29th, 2015 (Canon, Nikon)
May 12nd, 2016* (Sony)
* Date of launch in Japan
Optical Construction (10 elements in 8 groups)
MTF (Modulation Transfer Function) curves describe to what extent the tested lens can faithfully reproduce contrast of the subject in images it captures.
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. 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.
Lens performance differs depending upon directions. Solid lines show performance in the sagittal (radial) direction while dotted lines indicate performance in the meridional (circumferential) direction. When sharp lenses capable of delivering uniform optical performance over the entire image field are tested, MTF charts show curves plotted in good balance.
Performance characteristics of photographic lenses cannot be expressed with only MTF charts. There are other factors that are expressed in different methods, such as taste of softness and degrees of compensation of various aberrations. But you can use MTF charts as a scale to measure lens performance.