RedCat 71 WIFDRedCat 71 WIFD The William Optics WIFD 71 mm APO Astrograph is a premier tool for astrophotographers. The RedCat WIFD 71 provides color free apochromatic performance. With 4 elements in 3 groups (2 1 1 configuration), the 71 mm RedCat Petzval refractor is designed with a doublet made of FPL 53 glass up front, a single central element, and a single rear lens to provide a flat image plane without any need for an additional flattener. William Optics
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