Massa circular NDx4 screw-in filter 55 mm - neutral density optical filter

The Massa circular NDx4 screw-in filter with a 55 mm thread diameter is a neutral density optical filter that reduces incoming light by two stops. It allows photographers to use longer exposure times or wider apertures in bright conditions while maintaining natural color balance. The filter is designed to thread onto lenses with a 55 mm filter ring and provides controlled light attenuation for landscape, portrait and creative photography applications.

Advantages

The neutral density glass reduces exposure by two stops without introducing noticeable color casts, enabling motion blur effects and shallower depth of field when required. Its screw-in design offers a secure, compact attachment directly to lenses with a 55 mm thread, avoiding the need for larger holder systems. The optical surface is suitable for maintaining image sharpness and contrast under typical shooting conditions.

Suitable for

• Landscape photography requiring longer shutter speeds for smooth water or cloud motion
• Portrait work where wider apertures are needed in bright light to achieve shallow depth of field
• Creative long-exposure effects in daylight, such as light trails or motion blur
• Outdoor shooting in bright conditions when exposure control is necessary without changing ISO or aperture

Key specifications

• Filter type: Neutral density (NDx4), 2-stop light reduction
• Mount: Screw-in thread for 55 mm diameter lenses
• Optical effect: Reduces light uniformly to allow longer exposures or wider apertures
• Construction: Circular glass optical element in a metal thread mount
• Color balance: Engineered to preserve natural color rendition

How to use

Attach the Massa NDx4 filter by gently screwing it into the front filter thread of a compatible 55 mm lens until it is secure; avoid over-tightening. Compose and focus without the filter if preferred, then carefully recompose or confirm focus after mounting if necessary. Adjust shutter speed and aperture to achieve the desired two-stop reduction effect—typically slowing shutter speed for motion blur or opening aperture for shallower depth of field. Store the filter in a protective case when not in use to prevent scratches and contamination.

Usage recommendations

For best results, use the filter with stable support such as a tripod when employing slower shutter speeds. Check focus and exposure through live view or a test shot when precision is required, and clean the optical surfaces with a proper lens cloth and fluid to maintain image quality.