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  1. 180 new scope
  2. 152 on EBAY
  3. Optical Coatings
  4. Making a APO with a flat field
  5. Making a APO with normal glasses
  6. Google Earth
  7. Rotated secondary in Russian MakCass scopes
  8. Astreya other products
  9. M51 using 152 mm f/7
  10. 152F/7 Quadruplet Air space
  11. New 180F/9