The Hoya Diffuser filter gives a soft-focus effect due to the uneven surface pattern that spreads light rays traveling through your lens. 
The Hoya Diffuser filter is helpful when:
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“Softening” skin tones to reduce wrinkles or blemishes
	 
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Reducing overall contrast
	 
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Reducing the harsh “blown-out” look of highlights in light sources
	 
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Creating a softer mood in an image