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Old 21-12-2015, 01:32 PM
GaryA
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Struggling to get images come up on CPC 800 and Canon700d camera of Deep Space. Why?

Hi,
Needing some help please
I have a Canon 700d now and tried to set up to take the Tarantula Nebula and also the Orion Nebula but no matter what I do I don't see any image on my camera or Computer Screen. I am using a Celestron CPC 800 with a goto amount ( ideally not recommended for Deep space Photography with no wedge ) but that should not stop me to at least seeming something on the viewer and also computer. On the histogram there is a faint line but that is U/S if I cannot take the Photo when I set it to BULB etc.
BTW I can get Sirius and other Large Stars up no worries. With this Extender I can use lens's as well but do know if I take shots of any thing up in the never never the quality of light entering is reduced.:thanx :
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Old 21-12-2015, 01:58 PM
raymo
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Firstly, leave the computer indoors until you have sorted your problem.
Secondly, when on target, can you see the nebula in the camera's viewfinder? If not, then you are obviously not on target at all.
What extender are you talking about? Do you mean an extension tube,
or a barlow lens? If it is a barlow such as a 2x, why would you need it?
the scope already has plenty of focal length.
If it turns out that you are not on target, use the Go To with your
lowest power eyepiece. It is always harder to locate an object with a
long focal length scope.
Are the bright stars that you can see close to being pinpoints, or are
they small discs? Maybe the "extender" you refer to won't let you reach focus.
raymo
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Old 22-12-2015, 11:36 PM
GaryA
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Quote:
Originally Posted by raymo View Post
Firstly, leave the computer indoors until you have sorted your problem.
Secondly, when on target, can you see the nebula in the camera's viewfinder? If not, then you are obviously not on target at all.
What extender are you talking about? Do you mean an extension tube,
or a barlow lens? If it is a barlow such as a 2x, why would you need it?
the scope already has plenty of focal length.
If it turns out that you are not on target, use the Go To with your
lowest power eyepiece. It is always harder to locate an object with a
long focal length scope.
Are the bright stars that you can see close to being pinpoints, or are
they small discs? Maybe the "extender" you refer to won't let you reach focus.
raymo
Ramyo its called a Tele Extender made by Celestron. The Extender tube is really only for Planet and moon stuff so that's fine. My mistake should have read the manual properly. Of course now I now the Extender don't let me meet focus and have to buy another attachment to put my "T"ring onto and directly off the back of the scope. Do you have any idea how I can upload images onto the message?
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Old 23-12-2015, 01:46 AM
raymo
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Firstly, the tele extender is not specifically for planets and the moon.
The reason you couldn't come to focus when using it is because it is for
imaging with an eyepiece inserted into it. That is called eyepiece projection. Connecting the camera directly onto the scope without an eyepiece is called prime focus imaging.
You just need a simple T- adapter, one end of which screws into the T- ring, and the other end slides into the tube that you normally insert the eyepiece into.
To post images scroll down below your message and you will see a
button that says manage attachments. Click on it and a window will open.
Click on browse and click on the selected image, and the file
description will appear in the browse window. Click on upload button.
raymo
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Old 23-12-2015, 08:10 AM
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rustigsmed (Russell)
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adding on to what Raymo has mentioned, only the brightest stars will show up in liveview. you may need to take short exposures to help frame your shots. your scope is quite slow (f/10) for deep sky photography, so adding a tele extender will make it even slower (and therefore harder to see). i'm not familiar with SCT's you may need a extension tube to reach focus at prime focus (t-ring and t-mount) or you might not, that happens a bit on some Newtonians.
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