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Schmidt Triplet for ZTF

Schmidt Triplet for ZTF. R. Dekany 16 April 2013. Add refigured Schmidt singlet to existing Grubb-Parsons doublet. Features of latest design April 15. Singlet remains plane parallel Earlier quotes called for grinding a radius to one of the two existing plane surfaces

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Schmidt Triplet for ZTF

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  1. Schmidt Triplet for ZTF R. Dekany 16 April 2013

  2. Add refigured Schmidt singlet to existing Grubb-Parsons doublet

  3. Features of latest design April 15 • Singlet remains plane parallel • Earlier quotes called for grinding a radius to one of the two existing plane surfaces • New aspheric coefficient is about 70x smaller than the existing coefficient • … if original design is simply optimized Schmidt • Therefore, the ‘refiguring’ process for the singlet is fundamentally taking out much of the asphere • Insensitive to axial location for installation • Could be either inside or outside existing doublet • Relatively insensitive to axial location • 10 mm lateral misplacement barely affects image quality

  4. Image quality(g’ shown) • Evaluated assuming • g’ filter on inner 4 CCDs • R filter on outer 8 CCDs • … but it makes little difference after reopimizing • Field curvature under control • Same design IQ out (beyond) corner of 16 CCD FPA

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