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Old 03-07-2014, 09:10 AM
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Draco (Draco)
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Join Date: Jul 2012
Location: Sydney, Australia
Posts: 292
Unhappy Objects not in focus on the rim of the field of view and very shaky

Hi All

I was out last night, and my oh my, it was such a beautiful night to be out and gazing at the heavens. Apart from the cold, everything else was amazing.

I have a Meade 10" ACF in Alt/Az. I was viewing Saturn last night, which had just passed Zenith and was moving towards the West. I noticed that when I had Saturn in the center of FOV, it was crisp and in focus however when I used the slew arrows to move to the moons, and incidently moved Saturn to the edges, Saturn became quite out of focus.. so much so that I was seeing doubles of it, though they were very close. I found this to be same for Mars as well.

Is this normal behaviour with Meade ACF? I was under the impression that ACF (Advanced Coma Free) would ensure the above didn't happen?

Also, while I was using the telescope, if I tried to focus the object, I found that the image would shake quite abit. It will settle a few seconds after but it was quite annoying since I didnt know which way to turn the focus knob since the shakes blurred the object. This was more evident in the 10mm eyepiece than the 30mm. Is this normal as well or is there something wrong with my telescope?

Thank you for your help and look forward to views from all.

Have a great day.

Regards
Niv

Now I have a question
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