Discussion Overview
The discussion revolves around calculating the focal length and f-number (f/#) of a narrow field of view camera based on its specifications, including IFOV, FOV, resolution, and sensor characteristics. Participants explore the relationships between these parameters and the implications for camera design, with a focus on theoretical calculations and assumptions.
Discussion Character
- Technical explanation
- Mathematical reasoning
- Debate/contested
Main Points Raised
- One participant calculates a focal length of 6.167E5 mm and an f/# of 1.6E4 using the formulas f/# = Focal Length / Aperture and Focal Length = Aperture / (2 * tan(IFOV).
- Another participant requests clarification on the units of the field of view (FOV) and additional details about the lens or product specifications.
- A participant notes that the provided specifications only include IFOV, FOV, and resolution at 1 km, suggesting that the supplier is responsible for the design of the lens.
- One participant mentions that the resolution specification involves a lens and indicates a focal length of 400 mm if the pixel size is 9 microns, while also highlighting the complications of atmospheric distortion when imaging over long distances.
Areas of Agreement / Disagreement
Participants express uncertainty regarding the calculations and specifications, with differing interpretations of the information provided. There is no consensus on the correctness of the initial calculations or the implications of the specifications.
Contextual Notes
Participants note limitations in the provided specifications, including the lack of clarity on whether the FOV is in degrees or another unit, and the potential impact of atmospheric distortion on resolution at long distances.