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Old 24-12-2008, 07:43 PM
ausastronomer (John Bambury)
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Join Date: Mar 2005
Location: Shoalhaven Heads, NSW
Posts: 2,620
Hi Eric,

Scott is 100% correct. The T4 as distinct from the T5's and T6 series, aspire to meet specific but different design objectives. The T5 and T6 Naglers have shorter eye relief and their focal lengths do not overlap. The T4 Naglers aspire to provide long eye relief and eliminate Angular Magnification Distortion.

Cheers,
John B
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