The telescope manufacturer William Optics offers very high-quality apochromatic and achromatic refractors which are very well suited to visual observation, and especially to astrophotography.
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William Optics
Adjustable Flattener Reducer Flat6AIII
$ 343.00
ready for shipping in 3-5
weeks
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William Optics
Flattener Flat73A for ZenithStar 73
$ 378.00
ready for shipping in 3-5
weeks
