UV/IR, Clear & Specialty Filters

What Each Filter Does

• UV/IR cut: Essential for colour cameras without a built-in IR filter, and for refractors that show bloated stars from unfocused infrared.
• IR pass 685 and 850 nm: Infrared is less affected by seeing, so lunar and planetary detail improves on unsteady nights. Mono camera recommended.
• UV pass (Venus): Shows the cloud patterns of Venus that are invisible in visible light.
• Clear and protective windows: Keep focus consistent in a filter wheel slot and protect the sensor window.
• Fringe killer and semi-APO: Reduce the violet halo of achromatic refractors for visual use and imaging.
• DSLR conversion filters: Restore correct white balance and focus for modified DSLRs.

UV/IR and Specialty Filters: Frequently Asked Questions

Does my camera need a UV/IR cut filter?

Many astronomy colour cameras have only a clear window, so yes for broadband imaging. Check the camera's window type, or ask us.

Which IR pass filter is best for planets?

685 nm suits most targets and seeing conditions. 850 nm works on poor nights and for the Moon, at the cost of some resolution.

Not sure which filter you need?

Tell us your camera, telescope and what you want to improve. We will tell you which filter helps, if any.