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Ray,
Isn't there a function of glass type used with bloat and halo? I seem to recall there is, and have noted that images produced through true fluorite crystal elements suffer far less from the blue halo than do images with FPL53/ED element refractors.
I definitely can notice a difference between the FSQ106N (Fl) and FSQ106ED (ED) images - much more pronounced halo with the ED (and another reason why owners hang onto the FSQ106N till their dieing days). I also note a significant lack of any halo - apart from diffraction spikes caused by the element spacers - with my Vixen FL102S with the rear element being true Fl crystal.
Could be all conjecture, but it is noticeable in images comparing the 2 types of "glass".
I also have HEARD there is a difference between oil spaced and air spaced because of the reflection/refraction surface standpoint, but that one is a VERY large can of worms.
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