The one caveat is that some eyepieces have magnifying optics before the focal plane/field stop and this magnification affects the effective focal length of the telescope. Such eyepieces are call negative-positive because they have a Barlow-like tele-negative section as well as positive magnifying ...
Mechanically active athermalization of a forward looking infrared system Infrared Phys. Technol. (2002) M.S. Shechterman High-performance, wide-magnification-range IR zoom telescope with automatic compensation for temperature effects Int. Soc. Opt. Photonics (1991) Y. Tamagawa et al. Multilens sy...
Anisotropic inverse Compton scattering in the Galaxy Astrophysical Journal (2000)View more references Cited by (227) Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre 2021, Journal of Cosmology and Astroparticle Physics GALACTIC COSMIC RAYS in the LOCAL INTER...
Understanding the diversity and complexity of stand structure is important for managing the biodiversity of forest ecosystem, and stand structural diversity is essential for evaluating forest management activities. Based on the relationship of adjacent trees, a quantitative method of stand structure diversity...