Vintage Questar 3.5" Standard 1989 w/Cervit mirror and Broadband coatings 72° FOV 5 astigmatism correcting lens

5 astigmatism correcting lens

4 micron square A/D Conversion: 10-bit RAW Imaging Sensor: Onsemi AR2020 Back-Illuminated CMOS sensor Camera Resolution (in Pixels): 5240x3840 Total Number of Pixels: 20 MP Mounting: 1

so it is best used on bright objects with larger aperture telescopes

Celestron: C4

Vintage Questar 3.5" Standard 1989 w/Cervit mirror and Broadband coatings 72° FOV 5 astigmatism correcting lensYou know it; you love it. You've dreamt about it; you've drooled over it. Now one can finally be yours. We just came into possession of a 1989 standard model Questar in very good condition. The meniscus is mostly clean, but not perfect. There is some spotting that we have not been able to clean, but the view through it is sharp and clear, as you'd expect. There does not appear to be any delamination of any of the coatings. The body is clean and