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Originally Posted by Renato1
That's very strange. My filter is the original Lumicon one.
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What is strange? The Horsehead being an elusive object? I'd say that's in line with what pretty much everybody says.
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It was 16 or so years ago now, when I took my 14.5" dob to a club night at the Briars (Mornington Peninsula Astronomical Society site) - which isn't very dark - and I used a 26mm plossl which gave a 5.8mmm exit pupil.
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Have you seen it since?
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There were about a dozen people there, and all but one saw it without difficulty. The one who couldn't see it kept being given instructions by the others on where to look in the field of view, but it was to no avail, he couldn't identify it.
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Maybe he was the only honest chap of the bunch?
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From everyone else, there had been a stream of "Ahs" as they spotted it.
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Yeah, I get that too sometimes from people who didn't even find the eyepiece...
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Could it be that too small an exit pupil was being used on the 17.5" dob you were looking through?
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I'm not entirely sure which eyepiece we used, but it was the best one available for the task at hand, I'm quite confident of that. Alex put an OIII+Hb filter in, as far as I remember.
Cheers
Steffen.