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And the Critics Say…


Phil Harrington’s reviews in  Astronomy Magazine


OA-3.6 ATS, October 2003 NPB and VHT Nebula Filters August 2005

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Mike Palermiti’s review and test report of the OA-4.0


Ed Tings Reviews of the OA-4.0 and OA-5.5 at


Cloudy Nights  reviews of the OA-3.6ATS F/11,  OA—4.0 F/10,  OA—6.5 F/10  


Excelsis Telescope Reviews


Customer Comments