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Great shot, a very clever feature. Not perfect but without it you would have got severe star trailing at 2 mins exposure. Is your camera modified? It appears to have good sensitivity to Ha. I have the same lens in M42 mount but can't use it on my Canon as it won't focus to infinity with the adapter. I have an older Pentax istdl I can use it on but it's only a 6 MP sensor.
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