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2" filter with pinhole for laser collimating with barlow?
So I use my 2" barlow for laser collimating my dobsonian, and previously used a disc of paper with a hole that I made myself to focus the beam as it leaves the emitter.
I just realised the barlow has a thread for a 2" filter, and I figure I must be able to do better than the paper disc.
Is there such a thing as a 2" filter with a pinhole.. or is this something someone (without many tools or technical experience) can make themselves?
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