Optics: how gather and align light from a scene?

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Betelgeuse_LA
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Engineering micromechatronical systems
Dear forum,

I want to capture the light from a rectangular area by a monochromator in order to analyze the average intensity of the entire area, at specific wavelengths.
The monochromator is at a fixed distance from the scene.

What type of arrangement do I need (lens, collimator?, et.c.) ? From what I understand, a collimator is required to parallelize the light reflecting from the scene, because it must hit on the devices's grating as a parallel bundle. Also, the scene is not a point source, but a finite area reflecting light in any direction. And the distance to it is finite, as mentioned.
Many thanks in advance

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