Chroma Photometric Johnson-Bessell V Telescope Filter

This filter is designed for photometric measurements, specifically isolating the visual (V) band of the spectrum. It allows astronomers to measure the brightness of celestial objects consistently, adhering to the standardized Johnson-Bessell photometric system.

Yes, this filter features a standard 1.25-inch connection interface. It is designed to thread directly into most 1.25-inch eyepiece barrels or filter wheels.

The 3mm thickness is standard for high-quality photometric filters, but it is important to account for this in your optical train. If you are using an autofocus system or precise back-focus calculations, ensure your software or hardware setup is calibrated to compensate for the slight focus shift introduced by the glass.

While it is constructed from high-quality glass, this filter is specifically engineered for scientific photometry rather than visual observation. Its broadband bandpass is optimized for capturing accurate data with a CCD or CMOS camera, not for enhancing the visual contrast of nebulae or planets.

Because photometric filters have precise optical coatings, you should only clean them when absolutely necessary. Use a dedicated optical cleaning solution and a high-quality microfiber cloth, gently wiping in a circular motion from the center outward to avoid scratching the surface.