Di - The optimum class of lenses for both full frame and APS-C digital SLRs.

The designation “Di” (Digitally Integrated Design) marks a generation of lenses, which have been specially adapted to the requirements of digital SLR cameras. The result is high Resolution coupled with the best possible correction of the most common Aberrations, such as peripheral light fall off and Chromatic Aberration. Particular emphasis is placed on the lens coating in order to minimize the increased risk of ghosting and Flare with digital cameras.

The series was constructed for:

Owners of digital full frame SLR cameras
Owners of digital SLRs with an APS-C sized sensor

Owners of digital APS-C sized SLRs must take a so-called crop factor into account due to the fact that the Angle of View is smaller when compared to full frame, as the sensor itself is smaller. Tamron’s factor is 1,55. The effect is demonstrated with the following comparison.

Equivalent Focal Length comparison (for APS-C Chips)

: Focal Length comparison: Full frame / APS-C

: Focal Length comparison: 18mm

: Focal Length comparison: 28mm

Here is an Angle of View comparison using 28-300mm (as an example for Di lenses) together with full frame and APS-C digital SLR cameras. Since the chip size of APS-C digital cameras differs to full frame format, a factor must be taken into consideration to convert the Focal Length.

Di Lenses for Digital Photography

SP AF 28-75mm F/2,8 XR Di LD aspherical [ IF] MACRO
AF 28-300mm F/3,5-6,3 XR Di LD aspherical [ IF] MACRO
AF 28-300mm F/3,5-6,3 XR Di VC LD aspherical [ IF] MACRO
SP AF 70-200mm F/2,8 Di LD [ IF] MACRO
AF 70-300mm F/4-5,6 Di LD MACRO 1:2 SP
SP AF 70-300 F/4-5.6 Di VC USD
AF 200-500mm F/5-6,3 Di LD [ IF]
SP AF 90mm F/2,8 Di MACRO 1:1
SP AF 180mm F/3,5 Di LD[ IF] MACRO 1:1

Di II - The best choice for APS-C digital SLRs.

What does Di II stand for?

Di II lenses are designed for the exclusive use with digital SLR cameras, with a sensor size of maximum 16x24mm (APS-C). The image circle of these lenses are correspondingly smaller, therefore these lenses cannot be used on full frame cameras as Vignetting will occur. The smaller image circle improves the technical tuning of lenses on digital cameras.

The advantage of this class of lenses is, due to its construction even Wide-angle lenses, lenses with large Zoom ranges or fast lenses can be kept small and compact.

Image defects can be excellently corrected. Special attention was given to high Resolution, and the minimization of Chromatic Aberration and peripheral light fall-off up to the edges. Moreover, the stray light problematic of digital sensors is minimized by the use of new coating technologies. The internal multiple-layer coatings on cemented surfaces of plural elements were originally developed especially for Di II generation lenses.

Di II Lenses for Digital Photography

SP AF60mm F/2.0 Di II LD [ IF] Macro 1:1
SP AF10-24mm F/3.5-4.5 Di II LD aspherical [ IF]
SP AF 17-50mm F/2.8 XR Di II LD aspherical [ IF]
SP AF 17-50mm F/2.8 XR Di II VC LD aspherical [ IF]
AF 18-200mm F/3.5-6.3 XR Di II LD aspherical [ IF] MACRO
AF 18-250mm F/3.5-6.3 Di II LD aspherical [ IF] MACRO
AF 18-270mm /F3.5-6.3 Di II VC LD aspherical [ IF] Macro
AF 18-270mm F/3,5 -6,3 Di II VC PZD
AF 55-200mm F/4-5.6 Di II LD MACRO

Di III: For mirrorless compact camera series

Di III (Digitally integrated design): A designation Tamron gives to lenses
engineered specifically for mirrorless interchangeable-lens cameras with
no internal mirror box or pentaprism, adopting an optical design that
matches the characteristics of the digital camera.

* The lens can not be used with digital SLR cameras with a built-in mirror box
or with conventional SLR cameras.