the ASTROGRAPH's Equipment Evaluation Web Page
Product Evaluations and Comparisons are in PDF format.
Product Comparison: Astrodon Luminence and L2P light pollution filter.
Product Comparison: Astrodon Ha 36mm 5nm filter and Baader 36mm Ha 7nm filter.
Product Evaluation: TOA Field Flattener.
Product Evaluation: UltraWide Adapter.
The ASTROGRAPH, editor Robert Price
theASTROGRAPH at verizon.net