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Old 14-01-2009, 10:42 AM
mbaddah (Mo)
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Can't reach focus taking picture of moon with ED100?

Hi all

I attempted last night to take an image of the moon with my Canon 40D hooked up to the ED100 refractor (had t-mount/t-ring attachment). I was unable to reach focus (needed more 'in' focusing).

I understand this is common with dobs and need to move the primary mirror up, but what is the solution with refractors? Cheers for all the help
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Old 14-01-2009, 10:54 AM
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alan meehan (Alan)
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HI mbaddah
were you using the camera direct to the focus tube or did you have 90% diagonal attached i have a 100ed and can only get focus by putting the camera directly to the focusing tube
alan
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Old 14-01-2009, 10:58 AM
mbaddah (Mo)
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Hi Alan

Yes I had it attached to the diagonal. Is it possible to attach camera to refractor directly with t-adapter? Thanks Alan

Mo.

Quote:
Originally Posted by alan meehan View Post
HI mbaddah
were you using the camera direct to the focus tube or did you have 90% diagonal attached i have a 100ed and can only get focus by putting the camera directly to the focusing tube
alan
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Old 14-01-2009, 11:07 AM
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alan meehan (Alan)
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yes no worries remove the diagonal and you should not have any problems,just slide the camera directly into the focus tube
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Old 14-01-2009, 05:14 PM
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telecasterguru (Frank)
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I have an Acuter Imager and have the same problem with my Celestron refractor. It will not reach focus with the diagonal in.

Telecasterguru
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Old 14-01-2009, 07:38 PM
TrevorW
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For refractors I suggest buying a 2" and 3" extension tube for focusing
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Old 15-01-2009, 07:24 AM
mbaddah (Mo)
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Quote:
Originally Posted by TrevorW View Post
For refractors I suggest buying a 2" and 3" extension tube for focusing
I think you are right Trevor.I tried last night without the diaganol in and still wouldn't focus what difference would it make using the 2" over the 3"? Cheers
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Old 15-01-2009, 06:20 PM
TrevorW
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Cater for any occassion or additional accessories that may require different focal points
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Old 15-01-2009, 09:15 PM
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I will also be trying 2" and 3" extenders over the weekend, if the storms go away, and will report back.
I might even get some golf in!!
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Old 18-01-2009, 10:23 AM
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This is my report back.
I took the diagonal off the refractor and put the acuter cam directly into the scope and it focused up fine.
I then used the barlow that came with the cam and it also worked fine. What I couldn't work out was why the image in the barlow was smaller than the image without it!!!!
I then tried it on my dob and I could not get it to focus at all, very strange.
Any ideas?
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