1/1,800 of one degree) in order to avoid observing an obstructive double impression. Retaining such limited output tolerances for the alignment of their optical elements by laser or interference (collimation) at A reasonable cost stage is difficult. To avoid the require for afterwards re-collimation, the prisms are typically aligned at https://eosr42974.sharebyblog.com/18645519/canon-mirrorless-fundamentals-explained