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The 'industry standard' seems to be the Kendrick 2", that has a barlowing attachment too. Deadly accurate and easy to use. I use one on my 18" Dob. It takes me under a minute to get it bang on and be observing.
If you're setting up a telescope from scratch having, say, removed the primary, a green Holographic laser with a grid pattern is extremely useful.
Regards,
Rob
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