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: Nikon ProStaff 3-9 x 50 Black Matte Riflescope (BDC)
Product description: Magnification: 3-9x Objective Diameter: 40mm Exit Pupil: 4.4-13.3mm Field of View: 11.3-33.8 ft at 100 yds Tube Diameter - Other: 1 in Eye Relief: 3.6in Objective Outside Diameter: 50mm Eyepiece Outside Diameter: 44mm Overall Length: 12.4 in Adjustment Graduation - Other: 1/4 in Max Internal Adjustment: 80 MOA Parallax Setting - Other: 100 yds Waterproof/Fog proof: Yes Light Transmission - Other: Up To 98 Supplied Accessories: Nikon lens caps, Nikon windage, Elevation caps Weight: 13.7 oz Manufacture Warranty: Workmanship/Materials Lifetime Guarantee Manufacture Item Number: 6721 (Nixoplex), 6722 (BDC), Boasting Nikon's fully multicoated optical system and a huge 50mm objective lens, the tried-and-trusted ProStaff 3-9x50 riflescope keeps you hunting as late as possible. The scope's optical system transmits up to 98 percent of available light, ensuring maximum brightness in low-light, low-contrast hunting situations. To simplify field adjustments, Nikon also integrated a zero-reset turret into the riflescope. Just sight in as usual, lift the spring-loaded adjustment knob, rotate to your "zero," and re-engage. Field adjustments are now as simple as dialing in your subsequent ranges. And hunters will love the patented BDC reticle, which allows them to hold "dead on" at ranges exceeding those previously thought possible. The BDC's unique see-through ballistic circles offer an incredible advantage for long-range shooting, yet allow a normal sight picture for shorter-range shots where the crosshair itself is the aiming point., Nothing boosts a shooter's level of confidence better than generous, constant eye relief, which is why Nikon provided 3.6 inches of eye relief in the ProStaff. No more rough kickback from heavy recoiling cartridges, lightweight rifles, severe shooting angles, and just plain excitement. Other features include a nitrogen-filled, O-ring-sealed housing that's waterproof and fogproof; support for an optional sunshade accessory for bright, rainy, or dusty conditions; and a quick-focus eyepiece. Offering enough power for the longest shots and a wide field of view for thick brush or timber, the ProStaff riflescope carries a lifetime warranty., The ProStaff riflescope includes a BDC reticle with see-through ballistic circles. Specifications Finish: Matte black Reticle: BDC Actual magnification: 3 to 9x Objective diameter: 50mm Exit pupil: 16.6mm (3x), 5.6mm (9x) Eye relief: 3.6 inches Field of view: 33.8 feet @ 100 yards (3x), 11.3 feet @ 100 yards (9x) Tube diameter: 1 inch Objective OD: 2.37 inches Eyepiece OD: 1.73 inches Adjustment graduation: 1/4 MOA Max internal adjustment: 80 MOA Parallax setting: 100 yards Length: 12.5 inches, About Nikon The world leader in sports optics, Nikon is recognized globally for setting new standards in product design and performance. The unique strength of the Nikon brand is attributable to the company's unwavering commitment to quality, performance, technology, and innovation. Nikon markets and distributes riflescopes, field scopes, and binoculars.
Product feature: Compact riflescope with 3 to 9x magnification and 50mm objective lens, Fully multicoated optical system transmits up to 98 percent of available light, Zero-reset turret with spring-loaded adjustment knob; 3.6 inches of eye relief, Nitrogen-filled, O-ring-sealed housing for waterproof, fogproof performance, BDC reticle; quick-focus eyepiece; measures 12.5 inches
Product price: $199.74
Product brand: Nikon
Target attributes: Firing Action
Answer: attribute: firing action
value: None
source: None