Baader UV/IR-Cut / L-Filter – CMOS-optimized (2")

• 2" x 2 mm Baader CMOS UV/IR-Cut (420 – 685 nm) Bandpass Filter, suitable from f/15 to f/1.8 – with 2" (M48) filter thread
• Reflects harmful thermal radiation in the infrared spectral range
• Provides 98% transmission over the entire visible spectrum from 420 - 685 nm
• Prevents blurred star imaging with red-sensitive digital and CCD/CMOS cameras
• Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
• Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim
• Optimized for modern CMOS cameras, but likewise excellent for CCD camera technologies
• Mounted in Baader Low Profile Filter Cell (LPFC) – 6 mm height

The UV/IR cut filter is recommended in many cases:

• at least one lens is used in the light path which is not corrected to infrared light (most of the lenses are optimized for visible light)
• when taking images without an IR blocking filter in the camera
• when the Sun is still above the horizon or close to it (dawn/dusk lasts more in IR light) 
• if there's a strong IR light source next to the target object

GSO's filter is affordably priced and provides 90% transmission.

Baader's filters have a transmission of 97% between 420 and 680nm.

Astronomik's IR blocking filter are similar to Baaders but filter for Canon EOS APS-C cameras are also available.