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Hi Peter , I have a SKY90 and use it with a 2 inch , GSO Quartz 99% dielectric and I find this diagonal to be very good in this scope , better than my Zeiss prisim diagonal but I cant use the GSO in the Zeiss as its 1 1/4 inch only .
The Zeiss prism diagonal is better than my William optics 99% diagonal in my Zeiss tho , less light scatter around brighter objects with the Zeiss prisim diagonal and more natural tones ( in my eyes ) on the moon , perfect ! .
Hope this helps .
Brian..
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