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