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Found 1 result

  1. Dear all, After tinkering around several nights, i finally got around getting the Orion starshoot Autoguider (also called SSAG) into focus using a small 50mm guidescope. I want to share the info as i have received a ton of great advice from SGL users, and maybe there's a noob like me out there with the same problem? The biggest problem for me was that i expected the combination of the 50mm guidescope and the SSAG to be balanced to each other... but they are not. In other words, if you completey insert the SSAG into the guidescope, you will not be able to achieve focus. The distance between the foremost frontend of the guidscope to the back end of the SSAG should be around 21.8 cm. If you take a look at the photo below, you can see that the SSAG is not completely inserted into the guidescope; in my case, there is a space of 1.25 cm between the SSAG and the inmost position and about the frontend of the scope is about 0.3cm screwed out. These positions should get you very close to the optimal focus position. Getting the driver and installing PHD2 is straight forward. I suggest setting camera gain to 95, and exposure to auto. For final focusing, fire up PHD2 and select a star- PHD2 will show you the SNR (signal to noise ratio- the higher it is, the better). The do quarter turns of the scope's front lens, always checking the SNR after each turn, repeating the process until you reach the point of maximum SNR. Congratulations- you are on focus! To make all this more repeatable, you could get T2 adapters and adjustment rings so that you need no guessing around where the focus point is. That is left as an exercise to the reader
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