Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Tamron AF 60mm f/2.0 SP DI II LD IF 1:1 Macro Lens for Nikon Digital SLR Cameras (Model G005NII)
Product description: The Tamron SP AF60mm F/2.0 Di II LD Macro Lens with Nikon Mount is the first medium telephoto macro lens designed for APS-C size DSLR cameras that features a fast maximum aperture of F/2.0, one stop faster than the F/2.8 maximum aperture found on conventional macro lenses in the same class. The SP AF 60mm F/2.0 covers an equivalent angle of view of 93mm when converted to the 35mm format. With its fast F/2.0 maximum aperture, this new macro lens delivers dramatically attractive blurred background effects. And the addition of Internal Focusing (IF) and Full Time Manual Focus Control Mechanism to its list of highlight features makes this lightweight and compact 1:1 macro lens incredibly easy to use. FEATURES: World's first F2 Macro for APS-C DSLRsLongest working distance in its class (100mm)93mm equivalent on APS-C DSLRsFull-time manual control mechanismTwo LD Glass elementsInternal FocusingIdeal for portrait and macro shootingBuilt-In-Motor for use on all Nikon DSLR cameras
Product feature: World's first F2.0 Macro for APS-C DSLRs; ideal for portrait and macro shooting, Longest working distance in its class (100mm); Two LD Glass elements, 93mm equivalent on APS-C DSLRs, Full-time manual control mechanism; Internal Focusing, For Nikon digital SLRs
Product price: $49.76
Product brand: Tamron
Target attributes: Maximum Aperture
Answer: attribute: maximum aperture
value: f2.0
source: product feature
attribute: maximum aperture
value: f/2.0
source: product title
attribute: maximum aperture
value: f/2.0
source: product description