Interesting run-down there Allan. I tend to find the horsehead difficult, but definitely do-able in my 16". I've had some people look through and not be able to see it, where others can. I'd love to see it in dark skies with a 32", that would be mind-blowing!
I think you're right about having seen it makes it easier to detect the next time because you know what to expect.
I'm curious, with your experience, if there are other objects you'd put in a similar category for detection difficulty - as in, all but impossible in 12", do-able in 16" and quite detailed in 32"? If you feel like sharing, of course.
Cheers,
Markus
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