Tag Archives: Lens design

Infrared Camera Design

Cryogenic (SWIR; 0.7 – 2.5 µm) infrared cameras are specialized. For astronomical purposes thermal radiation from a room-temperature lens would swamp the signal beyond 1.5 µm. To deal with this signal such cameras at low temperatures (say 120 Kelvin). The … Continue reading

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Classical and β Anamorphism in Spectrographs

The anamorphic factor is something that must be understood and manipulated in spectrographs operating off Littrow. I describe the anamorphic factor through a series of videos. Continue reading

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Canon f/2.0 200-mm ZEMAX model

Based on Japanese Patent J2001, 253050, A, I constructed an approximate optical model for the Canon EF f/2.0L 200-mm lens. I can’t know for sure if this model matches the constructed hardware, but the model is a good starting point. … Continue reading

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