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Hi,
I'd second that.
I use the Orion Collimating Eyepiece and a Cats Eye infinity XLK autocollimator.
The XLK is really good and well worth it.
my scopes are F4's.
I would recommend a 2" sight tube as well. That helps with centering the secondary which is very important.
Or you could centre/offset spot the secondary with a felt marker, and center it with the collimating eyepiece.
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