Quote:
Originally Posted by Steffen
Not a good investment? I'd say that's pretty darn good for an 8" scope. I've only ever seen the Horsehead through Mental's 17.5", twice, the second time was really difficult.
Cheers
Steffen.
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That's very strange. My filter is the original Lumicon one.
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. 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.
From everyone else, there had been a stream of "Ahs" as they spotted it.
Could it be that too small an exit pupil was being used on the 17.5" dob you were looking through? The instruction that came with the filter said a 6 to 7mm exit pupil is required.
Regards,
Renato