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zoth

26 Iun 2010 12:33



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In legatura cu folosirea ocularelor Hyperion fara elementul barlow, uitati ce spune prietenul nostru Sven Wienstein:

Another thing to look at was the detachable Barlow lens of the Hyperions. Using it without the negative element drastically changed the performance of the eyepiece. The eye relief became really short so I had to flip down the eyeguard to get close enough. I can't tell you how close because it was just impossible to see the whole field that suddenly stretched to a gigantic 90° or something. However at a focal ratio of f/6 only 40° of the field had a good sharpness and not much more than 50° were really useable. With f/4 this gets even worse.