Review on Variable Polarizing Telescope Polarizer Luzid by Brian Cueto

Perhaps the block that I received was assembled incorrectly, but as a lunar filter it did not fit. To achieve a rotating polarized cutoff of most of the light, as required for use on the moon, the two components must be stacked in the same direction, A over B, not B over A. The problem is that the correct stacking order results in the rotating bevel is at one end, not in the middle. This means that the rotating slope does not change the bandwidth of the filter because it does not change the alignment of the two filters with respect to each other. It just spins the whole assembly useless. To change the filter gear, you must loosen or tighten the connection between the two components. The design isn't designed for this, defeating the purpose of the rotating bevel and making it unsuitable for telescoping if you don't put it on. Ignore loose filter rings hanging precariously over your secondary or diagonal filter and pray they stay in the orientation you installed them. It is possible that one of the filters on my device was simply installed the wrong way around in the housing. In any case, the device I received was defective or not suitable for the purpose advertised.