Askar FRA600 108mm f/5.6 Quintuplet Petzval Flat-Field Astrograph + 0.7x Reducer For Sale
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Askar FRA600 108mm f/5.6 Quintuplet Petzval Flat-Field Astrograph + 0.7x Reducer:
$2250.00
ASKARFRA600Quintupletrefractorwith108mmapertureandf/5.6focalratio,idealforwide-fielddeepskyimaging
Petzvaldesignensuresflatfieldacrossbig66mmimagecircle,whiletwoEDelementsvirtuallyeliminatechromaticaberration
Rotatable4.2”rack-and-pinionfocuser,M90-M54andM54-M48adapters,2”adapterring,and1.25”-2”adapter
Includesmountingrings,Losmandy-styledovetail,carryinghandle,andhardcase.Includesreducer:DesignedforusewiththeAskar108mmf/5.6quintupletastrograph,thenewAskarFRA600f/3.9full-framefocalreducerwith4lenselementsreducestheeffectivefocalratiobyafactorof0.7x,takingthisalreadyfastf/5.6scopedowntoaf/3.9systemwith420mmfocallength.Thatmeansawiderfieldofviewandagreatlyreducedexposuretime,makingiteasiertocapturewide-fieldimagesoflargedeep-skyobjects.Thereducerhasabackfocusof55mmandincludesthreadsforM48X0.75(2")filters.
