1.) Input section:

• ISO's pyramidal mirror
• shutter mechanism
• dichroic beamsplitter
• entrance slits
• filter

2.) Grating section:

• collimator
• scanner
• grating
• imaging optics

3.) Output section:

• grating mode:

• re-imaging correction
• relay optics
• filter
• detector arrays

• Fabry-Pérot:

• collimator
• scanning FP
• imaging optics
• FP detectors