4.2 inch F/6.6 Triplet ED APO refractor lens,NEW For Sale
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4.2 inch F/6.6 Triplet ED APO refractor lens,NEW:
$695
You are bidding a very high quality 4.2 inch F/6.6 triplet SD super APO lens,it used Ohara FPL-53 ED (Extra-low Dispersion glass) glass,zero false color,star testing showed outstanding quality. It can be used for both observing at high power and serious astrophotograph. Unlike other APOs which you can see false colorwhen precisely in focus,this lens is real false color free and offer you a TURE APO function.
D= 4.2 inch = 106mm
F= F/6.6 = 700mm
Resolution= 1.09 arc seconds
Visual Limit Mag.= 12.6
The attachment is spot diagram and astrophotos which taken by this lens,buyer pay $30 DHL shipping cost,3-5 working days to your door.
We also can offer tubes if you want.
