Chroma Filter

A clear filter is designed to protect your camera sensor and internal optics from dust and debris without altering the light spectrum. It is also used to maintain parfocality in imaging trains where other filters are present, ensuring your focus remains consistent when you swap between them.

This filter is engineered to be parfocal for systems operating at f/4.0 or slower. This means that if your setup meets these criteria, you should not need to refocus your telescope when switching to this filter from other parfocal filters in your sequence.

This filter is manufactured to high-precision standards, featuring a transmitted wavefront better than 0.25 waves per inch and parallelism of less than 30 arcseconds. These specifications minimize optical distortion and ghosting, making it suitable for demanding astrophotography setups.

This is a 50mm square filter. You should verify that your specific filter wheel or drawer is designed to accommodate 50mm square glass before purchasing.

That specification refers to the optical design's ability to maintain focus consistency. If you are using a very fast system (faster than f/4.0), you may experience slight focus shifts when swapping filters, though the optical quality of the glass itself remains high.