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
Focusing Mask Bahtinov 105-148mm
$ 104.00
ready for shipping in 24
h
Add to comparison
William Optics
Focusing Mask Bahtinov 243-308mm
$ 210.00
ready for shipping in 24
h
