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Toddylamo

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  1. Thanks Clarkey, Looks like I'll be going ahead with the 290, as I see that the 120 has problems finding a guide-star through high focal lengths. This seems to be the deal breaker issue that makes the more expensive 290 worth it.
  2. Thanks guys, At the moment my polar alignment is surprisingly good (I am in the Southern Hemisphere which makes things trickier), but I’ve had excellent results using ASPA. It will be interesting to see, once I get my autoguiding set up, if drift align through PHD2 is any better. I’ll probably go with OAG as I’ve got enough spacers of different sizes to get the appropriate backfocus. I guess that leaves me with the question of which camera should I buy. I understand the 120 has a smaller sensor than the 290, but that the 120 has larger pixels and is therefore more “sensitive” to light. ZWO gives a figure of “30% better tracking” accuracy on the 290 compared to the 120 as well. OAG on my slow telescope would mean that not much light is going to the guide camera sensor, so I need a more sensitive sensor, which points towards using the 120. On the other hand, the higher focal length means I need better tracking accuracy, pointing towards the 290. I’m not prepared to spend more than the price of the 290 (I’m also saving for a dedicated AP camera), so how should I negotiate this trade off?
  3. Hi all, I’ve been doing AP for about a year now, and after a few months photographing some of the brighter deep sky targets, I’ve decided it’s time to get an auto-guiding setup to help me increase my exposure times. I’ve been reading through forums for a while now but I’ve seen no clear answers on what route I should take. My setup is a NexStar Evo. 8” SCT (2032mm FL at F/10) on a wedge, typically using an F/6.3 reducer, and I currently image with a micro 4/3 DSLR with all the appropriate spacing (haven’t made the upgrade to a dedicated AP camera yet). I run this through 1.25 inch tubes. I recently started controlling my mount through CPWI on a windows 10 laptop. My guiding understandably drifts slowly over time, but is barely noticeable in sub-minute exposures. With this setup in mind, should I get an OAG or a Guide Scope, and with those options, is it necessary that I fork out a little bit more cash for a better guide camera (like an ASI290mm mini) or will a 120 mini suffice? I would ideally like to hear from someone who uses a 120 mini with a long focal length telescope. I am also a bit worried about my balance, as I can only slide my OTA so far down the mount rail to compensate for all the weight on the back.
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