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Hi guys, finaly I found out, was the backfocus extention for any given scope for the Riccardi x 0.75 reducer is: The magic answer is: 22 mm!!! So you add 22 mm to your initial back focus - e.g.: 55mm + 22 mm = 77 mm. Clear Skies Bros Christian 😃 |
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The backfocus changes based on the telescope and which reducer size it is. There is a sprite sheet somewhere on the internet with many scopes and the correct backfocus measurements. |
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55mm is not any kind of standard for reducers. The backfocus of that particular reducer (and almost all others) is telesope dependent and for Riccardi 0.75 it is not 55mm for any scope . The specs are from 70-80mm for , listed in https://www.apm-telescopes.net/downloads/manuals/Riccardi%20Reducer%20Info%20at%20May%202014%20(4).pdf for various scopes. |
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The plus of 20 mm backfocus is written in the manual of the Riccardi reducer. A far as I know, in the combination with the Skywatcher Esprit 100 ED and an ASI cam it would be 75 mm backfokus. |
