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Just do a web search for "star chart showing horsehead" and you will find plenty of images. The image called HH-finder.gif shows it well.
Note the nebula that is seen pink in photos is near invisible (black) and the 'horse head' object itself is just a little blacker than the surrounding black. Aperture and the H-beta filter helps but it is not guaranteed as the sky has to be very transparent too.
Note the Lumicon H-Beta filter has a bandpass of only 8nm which is very narrow and will make the background quite dark. Have a look at M42 too as it takes on a totally different appearance in H-beta. Enjoy!
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