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The next flat shows the F/10 FOV With the OAG. This looks like your OAG's prism is intruding on your light path. Depending on the OAG you might be able to adjust the prism depth. I have an ATIK OAG, and it had a lock ring to pull the spring-loaded prism in and out. It does mess with the OAG's focus, but PHD2 is pretty forgiving on focus. |
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Mike Miller:The next flat shows the F/10 FOV With the OAG. I have already adjusted my OAG's depth to where it is optimal, the issue is that the image circle of the HD8 is too small to effectively do that without detriment. I just take good flats and it calibrates out 90% of the time. |
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Ahh that makes sense. After I switched to a Moonlight focuser, I stopped using the OAG as it ate up too much backfocus. So I haven't actually used my OAG with the 2600. |
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Mike Miller: Yeah, and thats the deal with the 2400/410 chip, it's such a massively overmatched sensor when paired with the 8HD, that it has almost no room for the OAG to fit comfortably. I'd love to go get an Edge 11 to be able to not worry about that issue anymore, but at that price point I'm actually looking at an SCA260 instead because it's much more manageable for the deep NIR surveying that I'm doing, and I can put a Medium Format chip on it vs full-frame since it has an absurdly large 80mm image circle. I may lose an inch of aperture, but the design is much more friendly to my goals (especially considering I'm going to attempt UV DSO imaging, F/5 will help immensely). |
