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The main reason is that everyone's vision is slightly different. We all pretty much know this so we basically give estimates as to what we think might work. Another thing to note is that different wavelengths will have more rayleigh scatter than others so the dots may be similar in brightness but the beams could be way different in brightness.
Random note: drummerdimitri, the link in your signature doesn't work
Random note: drummerdimitri, the link in your signature doesn't work
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