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I've pinned the Crab from my home in central Sydney through an 8" dob without a filter.
It isn't a bright object, and it is small.
To find it, this is my star-hoping method, first use binoculars to find the necessary stars from urban areas:
First find Zeta Tauri, it lies just west of the tip of Orions 'club'. Immediately north of Zeta are two sixth magnitude stars (less than 1degree north). M1 lies in a staight line with these two sixth mag. stars, away from the 'club's' tip, almost the same distance that separates these two stars.
Use you lowest power to find it first through your scope, looking for a tiny disk of blueish smoke. If you think you've found it, you probably have. Verify with a med. power EP.
I use the Asahi 8.5 mag. charts which I down loaded via the Beginners forum stickies. The Crab is on chart number 56.
Good luck,
Mental.
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