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John
There is a review done in the August 2005 edition of Astronomy called Secret Weapons by Phil Harrington.
This is how he rated the F/Ts on a scale of 0-5. 0= object invisible; 1= visible only with great difficulty; 2= visible with moderate difficulty; 3= visible with little difficulty; 4= visible easily; 5= wow!
Object B33 NGC 2371-2 M76 NGC 1514 M42 M1 M37 M81
Baader
UHC-S 0 3 4 1 4 4 3 2
Lumicon
UHC 0 3 4 3 5 3 3 2
I've only given you the review for Baader and Lumicon Narrowband F/T's but it is a comprehensive review on all the major brands of Broadband, Narrowband OIII F/T's
I hope this is of some use to you.
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