I purchased a second hand reducer corrector for my ED80. It cost almost as much as the refractor itself, but its worth it

To flatten the field and also to increase your f/ratio, the ED80 offers a dedicated Reducer/Corrector 0.85x. Not only does it lower the f/ratio of the scope from f7.5 to f6.3, but it virtually removes all of the field curvature that comes naturally with a refractor.

Reducer/Corrector 0.85
Contains a quality ED element
Reducer/Corrector 0.85
Dedicated reducer for ED80

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