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FPL-53 is not just used to improve the chromatic aberration in an objective over that of FLP-51 , but really also to reduce the focal ratio requirements so a shorter F ratio can be used. F/8 Is quite ok and can get by with Fpl51 Fcd 1etc ...esp in triplets, as in Astrotech 115mm, a cracking scope! Its just FPL53 AND Flourite have more bragging rites.
bigjoe.
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