giocasi Posted November 26, 2020 Report Share Posted November 26, 2020 Goodevening. I'm italian guy, i buoght a 3" 0.73x corrector used from a austrian guy. while I was taking the measurements to make the fittings I realized that they were different from the specifications. I have attached photos of the corrector and the pdf with the specifications of the corrector ... even the real length of the corrector is different! have different models been made? Thanks for your help. Giovanni.Corr_3Zoll_Reducer.pdf Link to comment Share on other sites More sharing options...
giocasi Posted November 26, 2020 Author Report Share Posted November 26, 2020 as you can see, the measure of diameter on the pdf is 79.5mm while in reality it is 81mm Link to comment Share on other sites More sharing options...
MarkS Posted December 13, 2020 Report Share Posted December 13, 2020 I have an ASA 0.73 Reducer, and its dimensions are exactly as per the ASA drawing. Are you sure what you have is an ASA reducer? Mark Link to comment Share on other sites More sharing options...
Christophe Posted March 26, 2023 Report Share Posted March 26, 2023 Good evening, I have recently bought also an ASA 3" 0.73 reducer from an astronomer and I have exactly the same observation than Giovanni. I have measured external diameters of 81 mm instead of 79.5mm and 76mm instead of 76.2mm. I have also measured a total length of 73mm instead of 69.53mm. Have you been able to solve your problem. Even if the dimensions are slightly different, my main question is : can I trust with the backfocus values given by ASA ? Moreover just to be sure, for the values of backfocus given by ASA in the table, the f-ratio is the initial ratio of the telescope or it takes into account the 0.73x reducer ? Thank you very much for your help. Link to comment Share on other sites More sharing options...
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