Choosing Between 100mm and 150mm Filter Systems

What are the primary differences in physical dimensions and compatibility between 100mm and 150mm filter holders?

A 100mm holder typically measures roughly 120mm across, designed to accommodate standard 100mm x 100mm or 100mm x 150mm glass plates. These holders often feature a modular design, allowing photographers to stack two or three filters without excessive bulk. In contrast, 150mm systems are significantly wider, often exceeding 170mm in width to prevent the edges of the holder from encroaching on the field of view.

For example, a 100mm system fits perfectly on a 70-200mm f/2.8 lens using a standard 77mm adapter ring. However, a nuance exists with some "slim" 100mm holders; while they save weight, they may cause mechanical vignetting when used on 16mm lenses even if the thread size technically allows for the attachment. Always verify the physical clearance of the holder's frame against the lens's widest focal length.

How does the diameter of a camera lens determine which filter system size is required?

The lens diameter dictates the minimum physical footprint required to cover the glass without introducing dark corners into your frame.

• 82mm threads are the upper limit for most 100mm systems before the holder's frame begins to obstruct the corners of the image.
• 95mm barrels often require a 150mm system because the extra width of the filter glass is needed to clear the wider light cone.
• 105mm elements found on specialized prime lenses necessitate the larger 150mm format to avoid the physical edges of the filter holder appearing in your shots.

Which system is more suitable for ultra-wide-angle lenses that lack a standard filter thread?

Yes, the 150mm system is the standard choice for these lenses. These holders utilize custom-machined sleeves that slide over the lens barrel, bypassing the need for traditional threads entirely to accommodate the curvature of the front glass.

How do weight and portability considerations differ when choosing between these two systems?

The 150mm system adds substantial mass to your kit, often requiring a sturdier tripod head to prevent sag during long exposures. Carrying multiple 150mm glass filters also occupies significantly more space in a camera bag compared to 100mm equivalents. A lot of people assume that a larger filter system will automatically provide better image quality, but the size increase is purely a mechanical necessity for wide-angle coverage and offers no optical performance benefit over a 100mm system if your lens can accommodate the smaller size.

Is there a significant difference in the cost of filters and accessories for 100mm versus 150mm setups?

Investing in a 150mm setup is substantially more expensive, as the cost of glass scales exponentially with the surface area of the filter.

Use these estimates to calculate your total investment, keeping in mind that you will likely need at least three filters to start.

What are the specific advantages of using a 150mm system for architectural and landscape photography?

The primary advantage of the 150mm system in landscape work is the ability to use high-density neutral density filters on ultra-wide lenses without the holder frame appearing in the corners. This is vital when shooting at 14mm or 16mm, where the angle of view is so broad that any obstruction in front of the lens is immediately visible. The extra width provides the clearance needed to compose shots without cropping during post-processing.

Architectural photographers also benefit from the 150mm system's ability to maintain clear sightlines when using shift lenses. One exception involves specialized tilt-shift lenses that have a very large image circle; even with a 150mm system, you may encounter vignetting if you shift the lens to its maximum extent. In these specific cases, even the largest filter systems may require careful positioning to avoid unwanted darkening at the edges of the frame.

How does the risk of vignetting change when using a 100mm filter system on lenses with very wide fields of view?

Vignetting increases sharply when a 100mm system is forced onto a lens wider than 16mm, as the holder frame enters the lens's field of view.

• 16mm focal length serves as the typical threshold where a 100mm holder begins to show dark corners on full-frame sensors.
• 14mm wide-angle shots will almost certainly show the holder frame, creating a circular or rectangular shadow that ruins the image corners.
• 20mm lenses are generally safe and will rarely exhibit vignetting with a standard 100mm holder, even when using multiple stacked filter slots.

Are there adapter rings available that allow 100mm filters to be used on larger lens elements?

Yes, step-up rings exist to attach 100mm holders to lenses with smaller thread sizes, such as 67mm or 72mm. However, you cannot use these to put a 100mm holder on a lens larger than 82mm, as the holder itself will physically block the light path.