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Field flattener for the William Optics Zenithstar 73 OTA

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I "thought" i needed this but im just reading astrobackyards review on the WO ZS73 and he mentions "The Flat73 1:1 field flattener is recommended for full-frame astrophotography cameras"

I plan to initially use a D7000 and then down the line, possibly a dedicated camera. So, do i actually need it ???

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