Celestial hemisphere:  Northern  ·  Constellation: Lyra (Lyr)  ·  Contains:  IC 1296  ·  M 57  ·  NGC 6720  ·  Ring Nebula
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Messier 57 - 92% moon, Simon
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Messier 57 - 92% moon

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Messier 57 - 92% moon, Simon
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Messier 57 - 92% moon

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Description

As the nights are what they are at the moment, and with the rise of a very bright moon, I take my opportunities to try new configurations with my large Cassegrain scope, rather than waste darker nights on experimentation. I have a reducer that works with it, to bring it down to f8, from the f12, so I thought I would give it a go. I was going to try and image NGC 6210 with this set up, but I think that is better suited to the f12 combination. So, I slotted in the reducer, and lo and behold, the difficulties began. I am confident that the reducer works well, the issue was the change in focus and especially the balance of the scope - which is already a tough option for my mount. I was surprised at the change in focus distance with the reducer in the optical chain, which required me removing 8cm worth of focuser extensions, which, when done provided me with crisp focus. But, and here is the big change, the balance of the scope was massively out and the last thing I wanted to do was alter the position of the scope in the puck at night, because that would have thrown out the alignment of the scope on the chosen object. In effect, the scope was out by about 70 degrees from its best balance position! So, I went for it anyway. This image consists of 132 luminances and 50 RGBs, all at 1 minute each. The stars were awful and it is only by using a  deconvolution method that I have managed to get a much better shape for them, than they really are. The poor guider was going nuts! Anyway, I have posted this because in spite of the stars, I am pleased with what I managed to take and under such physically difficult conditions - sky wise and mount wise. The imaging time for this was 3 hours and 2 minutes, throwing away many subs as I went along. I think to get the faint outer ring will require longer subs under darker conditions, and of course some Ha would be beneficial. I hope you like my effort. Have a good day everyone...

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Messier 57 - 92% moon, Simon