La digiscopie avec un reflex numérique sans objectif

To digiscope with a DSLR camera, it is important to choose a model with an excellent objective (without  chromatic aberration, with a good definition and bright). In this article, Jean-Claude Vuillemin describes an original solution: using a digital camera without any objective! Indeed, if one can focus directly with the eyepiece of the Spotting-scope, you can get a « null objective » with an ideal transmission coefficient and reduced weight, chromatic aberrations, vignetting and price.