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I have for sale an Askar 65PHQ and reducer, this gives the ability to shoot at 416mm f/6.4, or you can use the reducer to image at 312mm f/4.8.
Being a quintuplet, its a lot like the redcat, in that its imaging field is completely flat straight out of the box, and the reducer is not required to flatten the field. The use of the reducer is only to provide a wider field of view.
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