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First impressions of the Forest Vixen

12 November 2007 by Piero Pignatta

Si tratta di un binocolo robusto per impiego naturalistico, impermeabile, riempito d’azoto, in lega di magnesio, è estremamente ergonomico, leggero e molto, molto nitido al centro; ai bordi invece si perde sensibilmente di definizione, più di quanto la foto faccia vedere (quella con il paesaggio di alberi e case, scattata con  metodo afocale).Nell’uso generico naturalistico (motivo per il quale l’ho acquistato) uno quasi non se ne accorge, mentre nell’uso astronomico appare in tutta la sua debolezza

Classica ed affascinante linea dei binocoli con Prismi di Porro


.Non penso quindi sia molto adatto ad uso astronomico a meno di avere l’esigenza di un vasto campo (8.8°) al solo scopo di cercare di comprendere più che si può un certo asterismo che serva poi da orientamento e al contempo avere un binocolo per uso generico da portarsi in montagna o al mare.

Il cut-off dei prismi nell’esemplare oggetto del test

Il  contenimento delle aberrazioni cromatiche  è eccellente e non mi risulta monti ne lenti asferiche nè apocromatiche, potrò darvi maggiori informazioni fra breve.

scatto ottenuto accostanto una fotocamera digitale compatta all’oculare del Vixen Foresta. Notate la resa cromatica

Le pupille d’uscita soffrono di un certo effetto cat’s eye, specie a sinistra, tuttavia l’immagine in cui compare l’intero binocolo accentua oltre il reale il difetto che invece è minimamente accennato a destra e più pronunciato a sinistra e corrispondente alle foto eseguite in linea sul singolo oculare.

Su questo aspetto vorrei aggiungere un mia impressione: di recente  Astrotech mi ha sostituito (senza alcuna spesa aggiuntiva e celermente, va detto) un 15×70 con l’11×70, in quanto con il primo non mi trovavo molto bene, mentre con il secondo va decisamente meglio (parere anche condiviso da Astrotech): ebbene su tale binocolo le pupille d’uscite sono perfettamente tonde  ma la resa globale è sicuramente inferiore al Vixen; mi rendo conto che due binocoli così diversi non possano essere paragonati, ma il dubbio che ho è fino che punto il difetto del cat’s eye può incidere sulla globale qualità di uno strumento?

 

 

Piero Pignatta
Piero Pignatta

Piero Pignatta: A pure visualist of the deep sky, with occasional digressions into mountain panoramas and birdlife. He observes only with binoculars, an instrument that has been a true revelation for him; he's obsessed with Miyauchi binoculars, and it's best to compromise on them rather than contradict him, lest his cosmic-existential equilibrium be seriously upset. His legend is the now unobtainable, sold out, and incredibly expensive 25x141, which could move him profusely just hearing its name. I don't rule out the possibility that he keeps a photo of them in his wallet.

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