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

Input:
Product title: Opteka 85mm f/1.8 Manual Focus Aspherical Medium Telephoto Lens for Canon EOS 80D, 70D, 60D, 60Da, 50D, 7D, 6D, 5D, 5DS, 1Ds, Rebel T6s, T6i, T6, T5i, T5, T4i, T3i, T3, T2i and SL1 Digital SLR Cameras
Product feature: This is a manual lens. You can only use the lens in "M" manual exposure mode or "A" aperture-priority mode, Designed to produce beautiful background blur, ideal for portraits and natural images, 10 lens elements in 7 groups of high index, low-dispersion multi-coated HD optical glass, All-metal body standard lens with f/1.8 maximum aperture and internal focus for Canon SLR cameras, Lens hood, caps, pouch and 5 year warranty included, Clip this coupon to save 5% on this product when you buy from Amazon.com. Here's how (restrictions apply), Metal body construction with hybrid aspherical element for exceptional, sharp images, Multi-coated HD glass optics to reduce flare and ghosting., Manual focus and aperture control, Removable lens hood., Lens Construction: 10 Elements in 7 Groups with 1 aspherical element, Angle of View: 28.5 degrees, Aperture Range: F/1.8-22, Minimum Focusing: 2.79 ft / 0.85m, Length: 2.7 in., Weight: 13.4 oz, Opteka 85mm f/1.8 Telephoto Lens, Opteka Hood, Opteka Lens Pouch
Product price: $9.92
Product brand: Opteka
Target attributes: Fixed Focal Length
Answer: attribute: fixed focal length
value: 85mm
source: product title
attribute: fixed focal length
value: 85mm
source: product feature