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===== Some examples of typical Tier 3 rigs ===== [https://i.imgur.com/U8m3x0O.jpg /u/Orangelantern's Setup] [https://i.imgur.com/0paSGBC.jpg /u/azzkicker7283's Setup] [https://i.imgur.com/8NXRtow.jpg /u/Windston57's Setup] You'll notice these do not have guidescopes. That is because we use something called an OAG, or Off-Axis guider. This involves using a prism to grab a small amount of light that is otherwise wasted due to the size of your main cameras sensor. They work the same way as a guidescope, but are a little more difficult to use if you are just getting started. That said, they are a great way to cut down on weight and can offer even more accurate guiding, but also do not provide as much light to the guide camera compared to a dedicated guidescope. As such, it is wise to use a more sensitive guide cam. Its up to you to determine what you think will be best for you and your wallet. '''Refracting telescope on Orion Sirius mount'''
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