Examples we did not gain from

• NIRI/GNIRS On Instrument WFS optics
  • may be offset with cryo gimbal complexity
  • this could have been simpler too
• GNIRS diamond turned optics
  • New technology developed to meet scatter spec that was too tight and did not affect performance at highest levels
  • Many existing vendors could have met needs without any development (at lower cost)
• GMOS optical design
  • May have been much simpler
    • many elements and glass types
    • should have been traded for cost savings early to see what is possible
  • IR performance perceived to drive design
  • IR goals should ‘come for free’

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