----------------------------------- Erwin 13 Dec 2021 09:24 ----------------------------------- Amici are drumul optic mai lung prin sticlă deoarece are mai multe reflexii interne. Ipotenuza acestei prisme este un acoperiș, nu o suprafață plană. Ce se găsește în comerț sub denumirea Amici este de multe ori greșit, pentru că de fapt este o prismă normală, similară cu cele Porro ce se găsesc în binocluri. Aceste prisme nu întorc imaginea complet, stânga și dreapta rămân inversate. Așadar, nu cred că folosind o prismă Amici vei ajunge în focus. An Amici prism is a type of roof prism which splits the image in two parts and thus allows an upright image without left-right mirroring. This means that what is seen in the eyepiece is the same as what is seen when looking at the sky, or a star chart or lunar map. The disadvantage of typical "correct image" Amici roof prism diagonals is that because the light path bounces around through a piece of glass, the total amount of light transmitted is less and the multiple reflections required can introduce optical aberrations. At higher magnifications (>100×), brighter objects have a bright line through the object viewed. Therefore, most Amici roof prisms are more appropriate for low-power viewing or in spotting scopes for terrestrial rather than astronomical use. But with low-power usage with a rich field, the field can easily be compared with star charts, as it is no mirror image. They are available in two types: with a 90º angle (like an ordinary star diagonal) and with a 45º angle. Such prisms are often used in spotting scopes for terrestrial viewing, mostly with a 45º angle. Such telescopes rarely use magnifications over 60×.