Hello Minh,
Finally there is inded some impact of the telecentric tilt on CWL and FWHM. Still, the impact is smaller that if the etalon alone was tilted (and the telecentric and the telescope shared the same optical axis).
See Zeemax and Oslo simulations there :
viewtopic.php?f=4&t=32038
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Christian Viladrich
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Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/