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

Input:
Product title: Canon EF 50mm f/1.8 II Autofocus Camera Fixed Lens - International Version (No Warranty) for Canon Digital SLR Cameras + 10pc Bundle Deluxe Accessory Kit
Product description: Lightweight and affordable, the Canon EF 50mm lens --which offers a fast f/1.8 aperture--is an excellent lens for people who prefer a fixed focal length. Canon's lightest EF lens at a mere 4.6 ounces, the lens boasts a traditional Gauss-type optical design that delivers a sharp performance even when wide open. As a result, the lens provides an image that's extremely close to how your eye perceives a subject, making it excellent for portraits and images that require a natural depth of field. In addition, the lens focuses as close as 18 inches, helping you take extreme close-ups. Finally, the lens offers an excellent color balance. Specifications: * Focal length: 50mm * Maximum aperture: 1:1.8 * Lens construction: 6 elements in 5 groups Diagonal angle of view: 46 degrees * Focus adjustment: Overall linear extension system with Micromotor * Closest focusing distance: 1.5 feet Filter size: 52mm * Dimensions: 2.7 inches in diameter, 1.6 inches long Weight: 4.6 ounces. ++PLUS++ 10pc Deluxe Accessory Kit: - UV (Ultraviolet) Protection Filter: protects the lens & reduces lens flare and ghosting caused by reflections - CPL (Circular Polarizer) Filter: Removes unwanted reflections from non-metallic surfaces, and lets you achieve vibrant color saturation - FL-D (Fluorescent) Filter: balances light in outdoor situations or where fluorescent lights are used - Filter case - Protective Pull String Closer Soft Lens Pouch - Soft Rubber Lens Hood (Prevents image-degrading lens flare by blocking stray light) - High Quality 2 in 1 Lens Cleaning Pen (brush & spray) - High Quality Dust Cleaner Blower (Excellent way to remove dust off sensitive camera parts without physical contact) - Universal Lens Cap Keeper - HeroFiber Ultra Gentle Cleaning Cloth.
Product feature: This kit includes 11 items, Lens includes manufacturer's supplied accessories, All items are backed with Hot Deals Electronics 1 year 100% Satisfaction Guarantee, Canon EF 50mm f/1.8 II Autofocus Camera Lens for Canon SLR Cameras (import, backed by Hot Deals Electronics 1 year guarantee), UV (Ultraviolet) Protection Filter - CPL (Circular Polarizer) Filter - FL-D (Fluorescent) Filter - Filter Case - Soft Rubber Lens Hood, Protective Pull String Closer Soft Lens Pouch - High Quality 2 in 1 Lens Cleaning Pen, High Quality Dust Cleaner Blower - Universal Lens Cap Keeper - HeroFiber Ultra Gentle Cleaning Cloth (the most effective way to clean all optical surfaces), Lens not zoomable
Product brand: Canon
Target attributes: Maximum Aperture
Answer: attribute: maximum aperture
value: f/1.8
source: product feature
attribute: maximum aperture
value: f/1.8
source: product title
attribute: maximum aperture
value: f/1.8
source: product description