Fits rear cell of most SCT's - For enhancing structure in diffuse emission and planetary nebulae. Threads onto the rear cells of Meade LX-series mirror-lens telescopes and onto Meade ED Apochromatic Refractors, using the Universal Thread Adapter. Also threads to other brands of SCT's as well. Clear aperture is 36mm.
Premium multi-layer interference filters, the finest obtainable. Use broadband ("B") filters to block most forms of light pollution; use narrowband ("N") filters in heavily light-polluted areas for for extremely high-contrast observing of faint nebulae.