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Yes you are right on all counts. The original filter for the 300mm was a gelatin holder. I bought a 48mm (same as eyepieces) filter holder very soon after. Yes my 300mm F2.8L is the non IS version. The IS version is not as good for astro as the non IS. My theory is that any optics that can move to compensate for lens movement cannot then be exactly aligned when one turns the IS off. Is the 'park' position perfectly aligned. My gut says NO.
Can it take a better terrestial picture at lower than optimum shutter speeds, of course!
Bert
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