Neutral Density Filters: Square vs Circular

Gear  •  Photography Tips

Square ND filters and circular ND filters are two types of Neutral Density filters that reduce the amount of light entering the camera. Both filters have their pros and cons, and choosing one over the other depends on the specific shooting scenario and the photographer’s preferences.

Photo captured by 85mm dot ca

Square ND Filters:

• Flexibility: Square filters are part of a modular system that typically includes a filter holder and adapter rings. This allows for easy swapping of different filter strengths or types (such as graduated ND filters) in the field without having to unscrew one filter and attach another.
• Multi-Filter Stacking: Square filters are easily stackable, permitting the use of multiple filters simultaneously, such as combining ND filters with graduated ND or polarizing filters.
• No Vignetting: Square filters are usually larger than the front element of the lens, reducing the chances of vignetting, especially in wide-angle lenses.
• One Size Fits All: With a filter holder and various adapter rings, you can use the same square filters on lenses with different filter thread sizes.

Circular ND Filters:

• Convenience: Circular filters screw directly onto the front of the lens, making them easy to attach and remove. This simplicity is advantageous in situations where a quick filter change is required.
• Compactness: Circular filters are more compact than square filter systems, making them more portable and convenient to carry.
• Protection: Circular filters also serve as an additional protective layer for the lens’s front element, helping to prevent scratches and dust from accumulating.
• Cost: Circular ND filters tend to be less expensive than square filter systems, especially if you only need a single filter strength.

In summary, square ND filters offer more flexibility and control, with easy filter swapping and stackability. They are well-suited for landscape photography or other situations where multiple filters are necessary. Circular ND filters are more convenient, compact, and cost-effective, making them an attractive option for photographers who prioritize simplicity and portability. The choice between the two filter types ultimately depends on the photographer’s needs and preferences.

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