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Huge image on screen


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Hi - I'm trying to capture an image of the sun, which when I'm looking through a 25mm eyepiece appears fine (Celestron 9.25). When I exchange the eyepiece for my ZWO ASI120MC-S and try to use SharpCap, the image is huge on screen - I can only see a small section.

What am I missing/doing wrong?

Thanks

 

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57 minutes ago, CornwallBob said:

Hi - I'm trying to capture an image of the sun, which when I'm looking through a 25mm eyepiece appears fine (Celestron 9.25). When I exchange the eyepiece for my ZWO ASI120MC-S and try to use SharpCap, the image is huge on screen - I can only see a small section.

What am I missing/doing wrong?

Thanks

 

You are doing nothing wrong. The sensor of the ZWO120 is quite small and the field of view you get with it will be a lot less than a 25mm eyepiece.

see here: for comparison. The larger circle represent the fov of a 25mm eyepiece and the rectangle that of the ZWO camera.

astronomy_tools_fov.png

 

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Try pointing at the moon, you'll be able to make a mosaic that's fantastic quality.  You'd need to reduce the focal length that you are using with the webcam be a huge amount to be able to get the whole sun in.  I don't think that a FR exists that could do it.  Switching to a DSLR should give you the ability to fit the whole sun in the image because of the much larger sensor.

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You may want to get some mosaic helper software as you are going to have a lot of tiles, it sucks to spend hours on a mosaic and then find that you missed a bit.

 

Even with a 0.33 reducer you would need a 6 pane mosaic to get the whole sun.

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2 hours ago, cjdawson said:

Try pointing at the moon, you'll be able to make a mosaic that's fantastic quality.  You'd need to reduce the focal length that you are using with the webcam be a huge amount to be able to get the whole sun in.  I don't think that a FR exists that could do it.  Switching to a DSLR should give you the ability to fit the whole sun in the image because of the much larger sensor.

And he'll be able to capture some wonderful AR closeups!

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Ah, the tortuous pain that is mosaics. This is my effort with an ASI120M on the moon a little while ago with a much smaller focal length than your C9.25, so you will have even more tiles to yours! If you commit to such a project and it works, you will have a simply awesome lunar/solar image though, the resolution would be astounding!

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