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At f4, yes important to tackle collimation seriously.
I work at f5 and use:-
The ususal visual "collimation cap" (read 35mm film canister with a small hole drilled in the bottom) to check for secondary mirror rotation or gross misalignment.
Laser (Hotech SCA, but any will do if you have checked that its own collimation is fairly good) to get collimation pretty close
Catseye Cheshire and Catseye autocollimator (with the off-axis view hole as well as the on-axis view) used as per the Catseye instructions to bring collimation to as best as I can.
I you have a 2" focusser, I'd recommend 2" tools.
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