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

Input:
Product title: 67mm Neutral Density Filter, K&F Concept 67mm ND Filter ND2 ND4 ND8 ND Filter 67mm Professional Photography Filter Set Compatible with Canon Nikon DSLR Camera Lens
Product description: Why Choose K&F Concept 1.Professional optical lens manufacturer. Made of import optics resin,top level of transmittance. Premium Picked up Product. Shop with Guarantee. 2. Dedicated toprovide products in high quality & good price. Made of metal sealing ring, much tighter. Laser fonts, much durable Meet Environmental Standards of RoHS ND2 ND4 ND8 Reduces the intensity by one/two/three degree , Great for portraiture and outdoor scenes in strong sunlight Reduces the amount of light reaching the film without affecting the color Allows wider apertures, effectively decreasing depth of field Cleaning Cloth(Random Color) Safe for all lenses surfaces Remove fingerprints and more serious dirt Original Shockproof Filter Bag Easy to store your lens filters Protect your lens filter from dust,shake and scratches It adds greater convenience and ease in many shooting situations NOTE: This kit is compatible with all 67mm lenses ONLY,Please verify your camera's lens thread size before ordering. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "" (diameter) symbol.
Product feature: Kit Includes: 67MM K&F Concept Filter Kit (ND2 + ND4 + ND8 Neutral Density) + Cleaning Cloth +3 Slot Shockproof Filter Bag, D filters (Neutral Density) reduce the amount of light reaching the film without affecting the color. Can be used to enable slower shutter speeds. Also can be used to better separate subjects from the background by allowing wider apertures, effectively decreasing depth of field. Great for portraiture and outdoor scenes., Neutral Density filters are often ignored by photographers, but they have several uses and offer the possibility to achieve otherwise unachievable results. ND filters appear grey and reduce the amount of light reaching the film, they have no affect on color balance., Compatible with the Canon Reble ( T5i T4i T3i T2i ), EOS ( 700D 650D 600D 550D 70D 60D 7D ) DSLR Cameras. 18-135mm EF-S IS STM, EF-S 17-85mm f/4-5.6 IS USM Lenses, Compatible with the Nikon ( D5200 D5100 D7000 D7100 D90 D60 D70 D40 ) DSLR Cameras.18-105mm f/3.5-5.6 AF-S DX VR ED,Nikkor 18-140mm f/3.5-5.6G ED VR,AF-S VR 70-300mm f/4.5-5.6G IF-ED Lenses; Compatible with the Pentax (K-30 K-50) DSLR Cameras. 18-135mm f/3.5-5.6 ED AL (IF) DC WR,DA 17-70mm f/4 AL [IF] SDM Lenses
Product price: $15.99
Product brand: K&F Concept
Target attributes: Shape
Answer: attribute: shape
value: None
source: None