Moon Crater vs Lunar Swirls: Which Prism Filter Fits?

Quick Answer

Choose Moon Crater if you want a centered subject surrounded by a symmetrical, multiplied halo across the whole frame. Choose Lunar Swirls if you want distortion on one side only, keeping the other half clear for a clean subject. Both are square-framed prism filters from REFLECTLENS®, and the real decision comes down to whether you want the effect everywhere or just half the frame.

What Each Filter Actually Does to Your Frame

Moon Crater uses a clear central glass that keeps your subject sharp and undistorted, while four angled lenses around it duplicate the image outward. The result is a symmetrical, fragmented look that feels structured and surreal — every edge of the frame gets multiplied, so the composition reads as a halo around your subject.

Lunar Swirls uses the same optical structure as the Black Hole filter, but only on one side of the frame. The other half stays completely clear, so you can blend distortion with clarity in a single shot. That asymmetry lets you isolate your subject on the clean side while adding motion, swirl, and tension to the other.

How the Trade-Off Plays Out in Real Shots

With Moon Crater, you commit to a full-frame effect. That's powerful for graphic, otherworldly images where the subject sits dead center and the surroundings become part of the pattern. The trade-off is flexibility: if your subject drifts off-center or you want a natural-looking background on one side, the multiplied edges will fight you.

Lunar Swirls gives you a split frame. You can place a sharp subject on the clear half and let the swirl build energy on the other side — useful when you want motion or tension without losing your main subject to distortion. The trade-off is that the effect is less symmetrical and less predictable across the whole frame; you're composing around a divide rather than a full halo.

Mounting, Rotation, and Handling Differences

Both filters are square-framed and available in multiple filter sizes, so you'll choose a size that matches your lens thread or adapter. Neither product listing specifies rotation control or filter-thread material, so if spinning the effect mid-shot matters to you, check the product page for your size before buying.

The practical handling difference is in how you frame. Moon Crater rewards a centered, locked-off composition where the symmetry does the work. Lunar Swirls rewards movement and angle changes, because the swirl side shifts as you rotate the filter or move the camera. If you shoot handheld and like to adjust on the fly, Lunar Swirls gives you more room to play.

Trade-Offs at a Glance

• Frame coverage: Moon Crater affects the entire frame with symmetrical duplication; Lunar Swirls affects only one side, leaving the other clear. Pick Moon Crater for all-over pattern; pick Lunar Swirls for a clean subject plus controlled distortion.
• Subject placement: Moon Crater works best with a centered subject; Lunar Swirls lets you place the subject on the clear half and build energy on the other. If you compose off-center, Lunar Swirls is the more forgiving choice.
• Predictability: Moon Crater's symmetrical structure is consistent across the frame; Lunar Swirls introduces motion and tension that shifts with angle and movement. Choose based on whether you want repeatable symmetry or dynamic, angle-dependent swirl.

Product Facts

• Moon Crater: Square-framed creative filter with a clear central glass and four angled lenses that duplicate the image outward. Keeps your subject sharp while multiplying the edges, so you get a symmetrical, structured look without distorting the center.
• Lunar Swirls: Built with the same optical structure as the Black Hole filter but only on one side; the other half remains completely clear. Lets you isolate a subject on the clean half while adding swirl and motion to the other, giving you a split-frame effect in one shot.

Which Should You Get?

Best for

• Photographers who want a bold, symmetrical halo around a centered subject
• Creators building otherworldly, graphic compositions where the whole frame is part of the effect

Not for

• Shooters who need a clean, natural background on one side of the frame
• Anyone who wants distortion limited to a single half of the image — choose Lunar Swirls instead