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Dobsonion skywatcher classic 200p


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Hi , I'm a technophobe and also a astronomy novice , I purchased my dobsonion,  set it up etc my problem is I can locate items like  moon etc through the view finder really clear but on the actual eyepiece ( main telescope ) if I use the moon for example all I see is light regardless which eye piece I use , or even using a moon filter , I've tried to refocus it   wondering of I've set it up wrong but no idea how 

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3 hours ago, Craig solomon said:

Hi , I'm a technophobe and also a astronomy novice , I purchased my dobsonion,  set it up etc my problem is I can locate items like  moon etc through the view finder really clear but on the actual eyepiece ( main telescope ) if I use the moon for example all I see is light regardless which eye piece I use , or even using a moon filter , I've tried to refocus it   wondering of I've set it up wrong but no idea how 

Is the light you see in the shape of the moon out of focus or just light? If it is later, you may want to check if the finder scope and main telescope are aligned properly. You can easily miss the moon by a few degrees but the glare will come through.

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6 hours ago, Kon said:

Is the light you see in the shape of the moon out of focus or just light? If it is later, you may want to check if the finder scope and main telescope are aligned properly. You can easily miss the moon by a few degrees but the glare will come through.

Hi mate , thanks for your reply I'd say a combination of the two if I'm honest , does the finder scope and the main telescope have to be perfectly aligned , forgive my ignorance but I thought finderscope was just to locate item , but had no relationship to what you see 

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10 hours ago, Dark Vader said:

Hi Craig, have you used both the 2" and 1.25" eyepiece adapters? 

Focusser should look like this for 1.25" eyepieces:

20220111_211944.thumb.jpg.71c4003c1abe96972a3ded1234da8419.jpg

 

 

Looks like I put an extra adaptor on , would that make a difference?

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40 minutes ago, Craig solomon said:

Hi mate , thanks for your reply I'd say a combination of the two if I'm honest , does the finder scope and the main telescope have to be perfectly aligned , forgive my ignorance but I thought finderscope was just to locate item , but had no relationship to what you see 

Think of your finderscope as mini-telescope, so what you see there, you should see from your main telescope as well. There are 3 little bolts that will allow you to adjust it. Best done at daylight; pick a target such as a tree or an antenna over 50m away and observe from the EP of the telescope and then try see the same with the finderscope. For finer tuning do it at night using a high mag EP and focus on a bright star and try bring this star in the finders cope as well.

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2 hours ago, Craig solomon said:

Looks like I put an extra adaptor on , would that make a difference?

Yes, it will cause the focusing issue you describe. If you take the 2" one out and just use the top one like in my pic, then set up your finderscope accurately, you should be pretty much sorted. Set it during the day as Kon has described using a distant tv aerial or electricity pylon, then fine tune it at night using Polaris. That one hardly moves at all, so you can also star test your collimation afterwards.

Edited by Dark Vader
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