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Add vignetting model #56

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dkirkby opened this issue Mar 7, 2017 · 1 comment
Open

Add vignetting model #56

dkirkby opened this issue Mar 7, 2017 · 1 comment

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@dkirkby
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dkirkby commented Mar 7, 2017

This issue is to implement an optional model of vignetting as a function of position in the focal plane.

Can vignetting be modeled as an achromatic multiplicative throughput factor that depends only on r? Should the model be specified via a tabulated data file or is there a standard parameterization that is flexible enough?

What is the definitive reference for the expected vignetting in DESI? Has the vignetting in eBOSS been measured?

@djschlegel
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DESI-2632 is the most detailed look at telescope vignetting. The chromatic effects will be quite small. A larger effect would be the vignetting as a function of the ADC position. This study uses a single ADC position.

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