----------------------------------- zoth 07 Iun 2011 06:50 ----------------------------------- Imi pare rau daca am produs suparare cu interventia de mai sus, intentia era sa subliniez ca starea de apocromatism nu se poate defini la ocular. Despre Yuri Petrunin autorul aminteste urmatoarele: Notice if you will both triplets achieve only two crossings at the e-line and the doublet only one. Yuri Petrunin commented in May 2007 that the Takahashi TOA series achieved apochromatism without a single crossing. Takahashi do not publish colour error diagrams but I have no reason to doubt Yuri. Even with the benefits of ED & Fluorocrown glasses, it is simply not practicable to obtain three crossing points in the red, green and blue, whilst keeping spherochromatism within ±1/4 wave at two wavenlengths. Cer senin pe acolo la star party-uri! Cred in continuare ca discutia deschisa de valy nu are utilitate practica pentru noi, dar va rog sa nu ma omorati pentru aceasta opinie :lol: