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You are right peter.
Peter Tan sells replacement filters separately as well as modding them. The only advantage of an ACF filter is that it will preserve your refractive index (plus acting as a dust shield). A simple filter removal is just as good (most dslr sensors have a clear glass cemented onto the sensor and not just a naked sensor).
If you plan to do everyday photography with your modded camera, then get the replacement filter. But if you want it for astro photos only (or don't mind manual focusing each shot), then a filter removal is just as good.
Cheers
Bo
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