HOYA X1 Green 46mm

It is primarily used for black and white photography. XO is extremely effective for outdoor portraits, as reds appear darker and greens appear lighter.

It's great for correcting skin tones, highlighting facial expressions in close-ups, and emphasizing a sense of liveliness. The X1 is extremely effective for taking indoor portraits under tungsten light.
FOR COLOR FILM:

These filters, such as K2 (yellow), G (orange), 25A (red), X0 (yellow/green), and X1 (green), are designed primarily for use with black and white film. However, they can be used with color films to create special color effects.

The Y2 Pro filter is especially useful for the clean contrast of blue sky, clouds and foreground. Provides natural sound reproduction. Often used for medium distance subjects.

The YA3 Pro filter increases the contrast between red and yellow colors. Especially useful for distant, outdoor, telephoto shots. Also useful for color photography, spectacular sunsets, seascapes, etc.

The R1 Pro filter is particularly effective for increasing contrast. Ideal for dramatic cloud effects in landscapes. It can also be used creatively in color and infrared photography.
HMC (HOYA MULTI COATED)

These popular filters are known for minimizing reflections on filter surfaces, which reduces flare and ghosting. The result is an average light transmission of more than 97%, resulting in sharp contrast and balanced colors. HOYA HMC filters are recommended to enhance the performance of today's multi-coated lenses.