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Also, the addition UV-IR cut filter is NOT required! I found by using the spectroscope that the remaining #1 filter is actually a very good UV-IR cut filter!!! This is never mentioned.
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That's interesting.
I understood that a reason for installing a UV/IR filter is to improve focus with straight through optics. Apparently not a problem with refractive/reflective optics.
Would this be true retaining only the low pass filter? The modification would be easier.