Antares Focal reducer 6.3 and Celestron C8. Backfocus info

Starlight Xpress Lodestar X2 QHYCCD QHY10 Equipment Reducer Help Needed
2 replies•189 views
Vittorio avatar
Vittorio avatar
Hi all,
recently I've bought a C8 and I've ordered an Antares f/6.3 focal reducer. I use a qhy10 (aps-c sensor), OAG and Lodestar x2 for autoguiding.
Could you help me to know the correct backfocus I need to have right correction and reducer factor of 6.3?
Info I've found online are very confusing :-(
Sorry for my terrible english :-)
Vittorio
Esko Tikkanen avatar
Esko Tikkanen avatar
Hi Vittorio

If you use Antares FR/FF at F/6.3 the distance should be 81mm. I have also Antares in my C8 and used it at F/5 with SBIG ST8300 camera. Today it is F/5.5  smile

http://www.astrotarp.com/Focal_Reducer_Distance_to_Sensor_Page.html
Vittorio avatar
Vittorio avatar
Thank you very much Esko :-)
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