William Optics 2 inch 0.8x Adjustable Reducer / Field Flattener 4
William Optics 2 inch 0.8x adjustable reducer and field flattener 4 for refractor astrophotography.
Price range: See on Amazon
What we liked
- + Adjustable design lets you tune spacing for different refractors
- + 0.8x reduction widens the field and shortens exposures
- + William Optics quality is known for solid machining
Trade-offs
- - Adjustment requires trial and error to find the best setting
- - Premium price compared with dedicated fixed flatteners
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