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Astro-Physics Gelatin Filter Holder for 4" Field Flattener

These two-piece filter holders were designed to hold gelatin filter sheets for deep-sky, tricolor photography. Purchase gelatin filter sheets from a camera store, cut into a circle slightly larger than the opening (be sure to allow enough material to secure the edges) and install. We suggest that you purchase a separate filter holder for each color filter that you plan to use.

4" version designed to fit 4" Field Flatteners.

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