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  1. 158 F/7
  2. 180 new scope
  3. 152 on EBAY
  4. Optical Coatings
  5. Making a APO with a flat field
  6. Making a APO with normal glasses
  7. Google Earth
  8. Rotated secondary in Russian MakCass scopes
  9. Astreya other products
  10. M51 using 152 mm f/7
  11. 152F/7 Quadruplet Air space
  12. New 180F/9