H&Y K-Series CPL + ND 濾鏡 (Drop-In)

H＆Y濾鏡的這款Drop-In K系列中性密度0.9和圓偏光鏡濾鏡是一種結合了固態中性密度效果和圓偏光鏡效果的濾鏡。它是專門為裝配在單獨出售的H＆Y過濾器100mm K系列過濾器支架和其中一個過濾器支架的轉接環之間而製成的。使用時，濾鏡的8倍濾鏡係數可減少3級曝光量。其0.9的濃度會使整個圖像變暗，從而使您可以以比通常所需的更大的光圈或更慢的快門速度進行拍攝。通過減慢曝光時間或增大光圈，您可以控制景深並更輕鬆地傳達運動。

同時，該濾光片可以濾除由於非金屬表面反射而偏振的光，從而有助於減少反射和眩光。來自太陽的光自然會由於反射掉空氣分子中的電子而變得部分偏振，從而導致光散射成霧狀。偏振濾光器垂直於反射光排列並濾除此定向偏振光，從而可以吸收很多這種光。這樣可以顯著減少眩光和非金屬表面的反射，並增加天空和樹葉的飽和度。

圓偏振片僅與線性偏振片的不同之處在於，除了線性偏振濾光片之外，它還包含一個四分之一波平面。該四分之一波平面的添加是使線偏振光圓偏振，以使用自動聚焦和曝光功能。由於光線是如何被線性偏振器分解和過濾的，因此在使用過程中自動聚焦和曝光精度會出現偏差。當光變為圓偏振時，它可以使用這些功能。

插入式K系列中性密度0.9和圓偏振鏡濾光片由Schott B270玻璃製成，以提高光學清晰度和色彩保真度。它們安裝在帶有外部刻度盤的齒輪鋁合金過濾器環組件內，該環允許過濾器獨立旋轉，以調節其偏振效應的強度。該濾鏡的每一面都包括八層防反射塗層，以防止內部重影和反射；以及防污納米塗層，當與水或油接觸時可改善成串效果，從而提高清潔效率。

• Drop-in neutral density and circular polarizer filter for a separately available H&Y Filters 100mm K-Series Filter Holder
• 0.9 neutral density filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required
• Providing a 3-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily
• Polarizing filter effect arranges, and filters, directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of the light
• Helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface
• Clears up haze in distant landscapes and provides more saturated, vivid colors
• Strongest polarization effect when used at a 90° angle from the sun
• Circular polarizer effect is ideal for use with digital cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features
• Each glass surface includes eight layers of anti-reflection coatings to prevent internal ghosting and reflections as well as an anti-smear nano coating for an improved beading effect when in contact with water or oil for greater cleaning efficiency
• Constructed from Schott B270 glass for increased optical clarity
• Filter pouch for storage and transport