Question 1

What is a reverse graduated ND filter and when should I use one?

Accepted Answer

A reverse graduated ND filter has its darkest density at the horizontal centre line, becoming progressively lighter toward the top and bottom. This matches scenes where the sun sits right at the horizon — sunrises, sunsets over the sea or flat plains — where a conventional top-dark grad ND would actually over-darken the sky above the horizon and leave the brightest part of the scene (the sun itself) underfiltered.

Question 2

What does ND 1.2 (4 stops) mean in practice?

Accepted Answer

ND 1.2 corresponds to 4 stops of light reduction. In practical terms, if your correct exposure without the filter is 1/250s, the filtered zone of the image allows you to shoot at 1/16s — or you can close down 4 stops of aperture while keeping the same shutter speed. For a reverse grad, this reduction is centred on the horizon transition zone rather than applied uniformly across the frame.

Question 3

Which filter systems and holders is the Haida 100mm rectangular filter compatible with?

Accepted Answer

The 100mm x 150mm size is the standard rectangular format used by most modular 100mm filter systems. It fits popular holders from Haida's own 100mm system as well as many third-party 100mm-format holders. Always check that your specific holder accepts 150mm-tall rectangular filters, as some compact holders are designed for 100mm square filters only.

Question 4

What does NanoPro multi-coating (MC) do for image quality?

Accepted Answer

NanoPro multi-coating is applied to both surfaces of the optical glass to reduce internal reflections, minimise flare, and repel water and dust. When shooting toward a bright horizon or directly into the sun — exactly the scenario this filter is built for — multi-coating makes a meaningful difference in controlling ghosting and keeping contrast intact compared to uncoated or single-coated glass.

Question 5

Is buying a used Haida NanoPro filter a good idea?

Accepted Answer

Rectangular filters are relatively straightforward to inspect for scratches, chips, or coating damage before sale, which makes the used market a practical way to pick up optical glass at a lower entry point. Every used Haida filter sold here has been individually hand-inspected and comes with a minimum 12 months warranty. Optical glass doesn't degrade with age — so as long as the coatings and edges are intact, a second-hand NanoPro filter performs identically to a new one. We verify that coating surfaces are clean and free from abrasion marks before listing.

Question 6

How does a reverse grad ND compare to a standard soft or hard grad ND for landscape photography?

Accepted Answer

A standard soft grad ND darkens progressively from the top of the frame downward, which works well for overcast skies or scenes where the horizon isn't the brightest point. A hard grad ND has a sharp density transition, suited to flat, defined horizons. A reverse grad ND like this Haida NanoPro is specifically optimised for when the sun is at or just above the horizon — the centre-heavy density prevents the sun itself from blowing out while keeping the upper sky and foreground naturally exposed.

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Haida NanoPro 100mm x 150mm MC Reverse Grad ND 1.2 / 4 Stop

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About the Haida NanoPro 100mm x 150mm MC Reverse Grad ND 1.2 / 4 Stop

Haida NanoPro 100mm x 150mm MC Reverse Grad ND 1.2 / 4 Stop

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