I have read that most of the newer digital cameras use what is called "hot mirroring" to remove the IR spectrum, but while shooting astrology shots with my telescope at night many of the planets are distorted because of the IR being emitted from the stars
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Anonymous
ANSWERS: 2
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So you want to know what to do about this? I don't know... get a different camera? I seriously doubt it's IR distortion... more like tropospherical distortion, eg ray-bending and scattering by humidity and dust in the lower atmosphere. Most digital cameras require relatively long exposure times to take photos of planets, etc. Maybe find one with a larger aperture, or a CMOS sensor instead of the standard CCD. That should require shorter exposure time. I don't know about the hot mirroring, all the digital cameras I've owned simply had a filter to remove the IR.
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All digital color cameras have IR blocking filters in them to keep the color balance correct. This makes the cameras insensitive to IR, which is makes them less useful for taking pictures of emission nebula which radiate in the red and infra-red spectrum. But for taking pictures of planets, it isn't a problem at all. I suspect your problem is either with focus, exposure, or tracking. Most planets are fairly bright, and need fairly short exposure times compared to most other astronomical objects. Focus is very difficult to get right with most digital cameras and astronomical objects. If you're shooting through a telescope, try using an aperture mask focusing aid such as this one: http://www.scopetronics.com/focusaids.htm Tracking or mount stability may also be a problem, blurring your pictures. Even though you are using relatively fast shutter speeds on planets, the magnification is usually very high, which can cause blur.
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