Celestron NexImage 10 - cannot obtain image

[StarGazingSiouxsie]

Hi,  

I'm here to bug you again with questions! 

Using an  F10 2800FL SCT I cannot obtain an image let alone focus anything. I have only tried in the daytime thus far - as I thought that would be an easier snecario to learn in.

I CAN get focus in my F5 Newtonian and I know for sure the camera is working. 

I am going straight through on the F10 (Cubs) just using a 1.25" visual back to insert the camera nose into the OTA. 

I've been advised to - 

Select easy target like the moon - use a 30 - 40mm eyepiece. Focus that. 

Take out eyepiecxe, install camera.

Select 3/4 of max gain and 3/4 of max resolution. 

Focus slowly while checking laptop screen. 

Any other tips / advice, please? All is welcomed.

There isn't isn't back focus issue using an F10 that I'm missing here - right? 

Thanks 

 

Siouxsie 

[PeterCPC]

I think that you need an extension tube to make up for the lack of the diagonal.

[happy-kat]

You could try slowly pulling the camera away from the back to see when it starts to see something to then know what sort of length extension you need.

[Bruce Leeroy]

If you need an extension remove a barlow lens element and use the remaining body as a temporary extension tube.

[michael8554]

Hi Siouxsie,

If it's like most SCTs you don't need any extensions, as they have a very large focus range, maybe thirty hand-twists on the focus knob.

This is probably why you think you can't focus it during the day

So try again during the day with a very fast exposure, and don't be afraid to twist the focus knob many times !

Then move onto the moon and stars.

Michael