Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Canon EF-S 18-135mm f/3.5-5.6 IS Standard Zoom Lens for Canon Digital SLR Cameras (New, White box)
Product description: The Canon EF-S 18-135mm f/3.5-5.6 IS standard zoom lens offers a winning combination of size, range and features and is a perfect complement to APS-C cameras. With high-quality optics, dedicated image stabilization and more, this new lens promises to be a favorite for EOS users., Covering a range from 29mm-216mm in 35mm format, Canon's new EF-S 18-135mm f/3.5-5.6 IS offers a winning combination of size, range and features and is a perfect complement to APS-C cameras. With high-quality optics, dedicated image stabilization and more, this new lens promises to be a favorite for EOS users. MTF charts Lens Specifications Focal Length & Maximum Aperture: 18 - 135mm 1:3.5-5.6 Lens Construction: 16 elements in 12 groups UD Glass: 1 Diagonal Angle of View: 74 degrees 20' to 11 degrees 30' Focus System: Inner focusing system Closest Focusing Distance: 1.5 ft. / 0.45m Filter Size: 67mm Max. Diameter x Length: 3.0 x 4.0 in./75.4 x 101mm Weight (lens only): 16.0 oz./455g Comes with Rear and Lens Caps 1 yr limited warranty
Product feature: 18-135mm lens with f3.5-f.5.6 aperture; for use with APS-C cameras, 35mm equivalent to 29mm-216mm focal length range, Dedicated image stabilization, Lens construction of 16 elements in 12 groups, Compatible with 67mm filters
Product price: $37.26
Product brand: Canon
Target attributes: Maximum Aperture
Answer: attribute: maximum aperture
value: f/3.5
source: product title
attribute: maximum aperture
value: f3.5
source: product feature
attribute: maximum aperture
value: f/3.5
source: product description