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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 (click here to order
back issues) 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 scopereviews.com
Cloudy Nights reviews of the OA-3.6ATS F/11, OA—4.0 F/10, OA—6.5 F/10 |
