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John,
I am aware that 17 mm Nagler Barlowed gives me 8.5 mm. Dont know mate, its not about slightly bigger magnification with Barlowed Nagler over 10 mm Pentax XW. I am very happy with Pentax but I am happier with Barlowed Nagler. Thats all I am saying.
I have 2" Japan made Barlow, dont know the brand but its excellent quality.
cheers
bob
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