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Old Saturday 3rd June 2017, 22:11   #1
SzimiStyle
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Kowa TSN 663 vs TSN 601 image quality

Hi, I'm looking for advice regarding the two scopes mentioned above. Is there significant image quality difference between the two. This looks to be a stupid question but wanna hear your opinions. I need one for traveling.
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Old Sunday 4th June 2017, 17:36   #2
jring
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Hi,

the 663 will be a bit brighter due to more aperture at equal magnification and it will be sharper beyond 40x. Image quality usually degrades quite a bit in non ED spotters beyond that due to longitudinal CA.

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