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Richard et al,
Removing both the colour balance filter (the usual mod) and the front dust shake/ AA filter removes all the UV-IR cut off.
The sensor now gets a full spectrum hit and based on spectroscopic measures can record from 360nm in the UV right through into the NIR.
Great for spectroscopy but can lead to star bloat in astrophotography ( excess UV and /or excess IR). Obviously less of a problem in fully reflective scopes which bring all wavelengths to a common focus.
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