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Thread: Is an IR filter necessary for a ccd camera when imaging with mirror optics

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    Default Is an IR filter necessary for a ccd camera when imaging with mirror optics



    I've got to get an answer that I can live with, is it necessary for a ccd or cmos, mono or coor to have the IR filter? when imaging DSO nebulosity will it not grasp the red ? can I screw an IR/UV cut filter to he camer ose piece?
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    Default Re: Is an IR filter necessary for a ccd camera when imaging with mirror optics

    The IR cut is higher than h alpha wavelengths so no worries there. Yes an IR cut filter is necessary though.
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    Default Re: Is an IR filter necessary for a ccd camera when imaging with mirror optics

    This depends on the camera being used. I have modified many webcams. Some have the IR cut filter applied directly to the front of the CCD or CMOS sensor. Others had the IR cut filter applied to the lens focusing optics, thus when I removed the lens to make the webcam operate at prime focus, I had also removed the IR cut filtering. This was solved with adding the 1.25" IR cut filter to the nose piece. Most astronomical CCD or CMOS cameras will specify that they are filtered or not. Check your cameras specifications. The spec may also be given in the wave lengths that the camera is sensitive to.

    JJ
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