Hoya Red 25A - Especially effective for increasing contrast.

Hoya Green X1 - Great for correcting skin tones, bringing out facial expressions in close-ups and emphasizing the feeling of liveliness.

Hoya Orange GK - Increases contrast between reds and yellows. Particularly useful for distant outdoor shots taken with a telephoto lens.

Hoya Yellow Green X0 - Used primarily for black and white photography.

Hoya Yellow K - Especially useful for clear contrast between blue sky with clouds and foreground.

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