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At 3m FL you definitely need to go the OAG route because of flexure between the imager and the guider. The only issues you might run into with an OAG is not enough back focus or bad field correction so it will be harder to find a proper guide star. You also need a very sensitive guider like a lodestar. Otherwise it will limit your practical frame rate. You might have to expose every 3s to start seeing any guide star. This all depends on your telescope and how wide the imaging circle is in the first place. When you choose a guider also keep in mind its dimensions. It might have to fit in tight spaces so if the body is too wide it won't work. The lodestar is the size of a small eyepiece. A QHY5/ZWO looks more like a can of tuna. I also see you can pick up a lodestar for the price of a ZWO from bintel.
Last edited by multiweb; 12-08-2017 at 01:11 PM.
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