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RE: (IAAC) Object: M45, Instrument: 16" Newtonian f/4.59



At 05:12 PM 9/8/97 -0400, Todd wrote:
>>Hi Todd:
>>Darker skies should help in seeing the nebulousity surrounding M-45. I
>>have seen it in my old 6.8" f/14 AP refractor under very dark skies
>>(est. limiting mag. 6), and it was easy in my 20" Obsession both with
>>and without a filter under reasonably dark skies (est. limiting mag.
>>5.3).
>
>filterless?
I rarely find that the DeepSky (or other broadband) filter helps with
reflection nebulae or galaxies (continuous-spectrum objects). There are
certain conditions (like a hazy night under a VERY dark sky, or a very
transparent night under a very light-polluted sky) where paradoxically the
DS WILL make a difference, though. Have others had the same experience?
Anyway, the observing sessions I cited where the Merope nebulosity was
visible were all WITHOUT the use of any filter... Not that a DeepSky
mightn't have improved the view those nights even more: I just didn't
happen to think of trying it out at the time!
Lew