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From my research, it seems traditionally OAGs are more common (or even considered essential) on longer-FL scopes. my question: anyone out there using an OAG on an E130? Is there any discernible improvement or advantage over a (properly mounted) guidescope? Cheers, d. |
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| I use an OAG on my Epsilon 160 which has the same 56.2mm backspacing. Before I switched to the OAG I was using a guide scope. I got better guide results with the OAG on my rig. |
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| I have a bigger brother in the family of epsilons, the 210 and it's quite different from the newer, smaller versions. Anyway I use an OAG for guiding when I guide at all. It Is far more better to me to do so, these scopes have a big corrected field to use for OAG. To me, the results are better. It is always better to use the same optics for imaging and guiding when Is possible. My two cents... |
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| My conventional, ZWO mini guide scope sits atop my E-160. The guiding I get seems very good, with tight crossing RA/DEC graph lines and sharp stars. |
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| I use my 10“ RC in a dual setup as a guidescope for my 160ED. Round (measured eccentricity <0.35) up to 20min. The FL of the Epsilons is low enough to not need an OAG if your setup is tight and without flex. In addition, you don‘t really need long exposures (i‘ld be fine with 60s in Bortle 6). |
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There is not much of an advantage in terms of actual imaging. It is rather easy to reliably guide a widefield telescope with a traditional guide scope. It becomes more a matter of preference. Is an OAG convenient for your setup? Do you prefer it to transporting and setting up a guide scope? Would you rather use any associated loss in backfocus for other accessories? I use a guide scope with my e130D. But I also have a ZWO ASI2600MC Duo which I use with it, sometimes, and I’m quite happy to use the guiding sensor whenever that camera is used. But it isn’t providing any real upside in guiding accuracy that reflects in the images. |
