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cmjrff
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« on: November 13, 2009, 09:39:25 AM » |
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Should the bullseye collimation sticker on the primary mirror be seen when viewing a terrestrial object? I am very new to all this but I thought the center of the primary mirror never came into view through an eyepiece? Thanks for any information from more experienced users.
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DSOMAN
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« Reply #1 on: November 13, 2009, 10:55:18 AM » |
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You should not see the collimation marker but if you are using a wide angle eyepiece [25mm or so] you may see a dark area in the middle of the field.
Brent
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cmjrff
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« Reply #2 on: November 13, 2009, 11:06:52 AM » |
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Brent,
Thank you for the quick reply. It is on a 26mm eyepiece that I am seeing this spot. I think I am seeing the marker itself. Do you have any idea how this could be? After collimating as closely as I could, the marker has moved to dead center, right on my eye's reflection. I don't think it is simply a dark spot but it looks more like the bullseye of the marker itself. If the clouds lift this afternoon, I'll be doing a field test to see what its like in a dark sky. Many thanks for any information.
Charles
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DSOMAN
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« Reply #3 on: November 13, 2009, 02:13:36 PM » |
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Charles,
Well that's a strange one. I have never seen that on my SN10. There should be no light hitting the center of the mirror due to blockage from the secondary but you can see a small dark area dead center when focused with a wide field eyepiece. If you try a 12mm eyepiece or so is the spot smaller or goes away.?
Brent
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cmjrff
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« Reply #4 on: November 13, 2009, 03:53:40 PM » |
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Thanks again for responding. I used a 4.something eyepiece on the only night I've had it out so far. It is much less noticeable or goes away. I will try tonight if it is clear and report back. Thank you again for responding.
Charles
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cmjrff
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« Reply #5 on: November 15, 2009, 09:37:48 PM » |
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Well we finally had a clear night in this part of Alaska. Really enjoyable, successful field test of my new scope. The collimation seems excellent and the goto function and alignment made for some excellent viewing. Thank you Brent and others for helping me get started. I hope for many hours of enjoyment. In these parts, a clear, dark night often means really chilly temperatures. It was about 8 degrees above zero with light wind. Yikes. I'm pleased to say that the slewing, focusing, etc. all seemed to perform quite well even in the cold. I could see no collimation sticker even with the low power (26mm) eyepiece in the dark. It shows up when doing the motor set up using terrestrial objects however. Weird, but doesn't seem to pose a problem when it counts.
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mhminor
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« Reply #6 on: November 15, 2009, 09:56:43 PM » |
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Charles -
8 degrees above zero? Wow - it is good to know that the scope and mount had no problem with that temperature. Where I live, it may get to 28 degrees 5 or 6 times a year. I will no longer complain.
Mike
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DSOMAN
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« Reply #7 on: November 15, 2009, 10:00:57 PM » |
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Glad to hear everything is working. I am out right now imaging with the temp at 41 deg. I won't complain anymore.
Brent
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