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I'm considering using a 2" filter for astrophotography with DSLR and mirrorless cameras. Filters are typically measured in mm, but I understand that a "2 inch" filter is really a 48mm filter.

Does this mean that 2" astro filters can be used with cameras with a typical 48mm step-up/down ring?

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  • $\begingroup$ It’s the first time I hear/read that 2″ filters are really 48 mm in diameter. I’d like to know your sources for that, as I doubt it. But what I’m really commenting for, is that if what you are trying to install is smaller than the hole/thread, then a very affordable solution could be adding tape—normal scotch tape can work for some, or black electric tape for other purposes. I once bought a 0.965″ filter only to discover my eyepieces were really 1″, but adding tape fixed my problem without having to buy any adapter. $\endgroup$ May 25, 2023 at 4:50

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Yes it is possible to mount astrophotography filters with 48 mm threads to DSLR or mirrorless cameras using step-up or step-down adapter rings to mate with the lens threads.

I have occasionally attached broadband UHC type filters on DSLR lenses for wide field imaging. However, I have not tried dual band filters such as the one you linked, but have read some discussions of their use, probably in the cloudy nights forums under the DSLR/Mirrorless camera topic.

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