|
There are 2 main advantages of fluorite and one big disadvantage.
Fluorite has way less dispersion. If you get a green laser and shine it through an FPL53 triplet you will see each lens. If you do that with a fluorite the laser will be invisible in the fluorite lens component.
Fluorite also enables the optical designer an extra degree of freedom. It lets them make a faster scope with the same levels of chromatic aberration.
The disadvantage is its soft.
I noticed in my uses of fluorite versus FPL53 that fluorite based scopes tended to produce more colour in the images.
I noticed it immediately when I went from an FSQ106EDX111 to a TEC110 F5.6 fluorite. The TEC produced much richer colours. Of course processing comes into this but I am saying with similar levels of boost etc.
I have used both fluorite and FPL53 and I would take Fluorite lensed scopes over FPL53 if I could get it but I would not care too much if I couldn't.
Greg.
|