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Solar H-Alpha Imaging

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15 replies to this topic

#1 astroflak88

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Posted 06 June 2020 - 10:36 PM

Hi All,

 

I have an ST80 refractor, which has a 400 mm focal length. I used a 20 mm eyepiece and with no problem I was able to get a wide field view with the entire sun in the eyepiece. Then I put in my ASI385mc, it showed a red dot and I couldn't get it to focus or even make an image anything close to visual. I tried the 4x Barlow, and nothing. Am I doing anything wrong? I used the default software that ASI provides and installed all the drivers. I got the camera to act like a webcam but the minute I pop it in the eyepiece holder of my quark, nothing. No luck



#2 Bokchoy Ninja

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Posted 06 June 2020 - 10:53 PM

Does your sensor have any spacers on it?

 

Your problem is just that you're just out of focus. You need to make sure you have enough backfocus for the image to be on the sensor. Can you post a picture of your setup with the sensor attached?



#3 JamesMStephens

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Posted 06 June 2020 - 11:00 PM

This isn't h-alpha imaging, it's white light.



#4 Bokchoy Ninja

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Posted 06 June 2020 - 11:02 PM

This isn't h-alpha imaging, it's white light.


Yes but the troubleshooting will be the same for the OP's problem

#5 hopskipson

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Posted 06 June 2020 - 11:02 PM

If you're using the camera without the diagonal you will need more back focus with the Quark.  Do you have the Quark Combo without the built in telecentric and that's why you're using the barlow?  With the camera you're using you will only get a portion of the sun on the sensor.  Sounds like you're not reaching focus but you'll need to provide more information.



#6 astroflak88

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Posted 06 June 2020 - 11:06 PM

I have the quark gemini (Chromosphere/Prominence) models. I didn't take any photos of the setup.  It seemed like I was having back focus issues, I will have to try it out again tomorrow, I will post pictures.


Edited by astroflak88, 06 June 2020 - 11:07 PM.


#7 hopskipson

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Posted 07 June 2020 - 08:33 AM

Okay, so when you added the Barlow you pushed the focal point back further. You should reach focus with the diagonal and no Barlow. If you are going straight through you need some spacers.

#8 astroflak88

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Posted 07 June 2020 - 06:53 PM

Here is a picture of my setup while I can see the entire field of sun visually and focused my camera on other hand can never focus no matter what I do whether it's adjusting lens on camera or in focusing or out focusing at diagonalb4549d459135e063e30060f58048f332.jpg9f6abb6e5f4560232be3c21dd878c41c.jpg

Sent from my motorola edge plus using Tapatalk

Edited by astroflak88, 07 June 2020 - 06:54 PM.

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#9 UniversalMaster

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Posted 07 June 2020 - 11:35 PM

You seem to use a 1.25" diagonal, which has a shorter light path than a 2", so you may need an extension tube.

With the camera streaming and a short exposure time, try losing either the diagonal or the Quark and simply move it by hand further away while trying to keep it as straight as possible and notice if the focus improves and if you can get it close to focus. With a bit of practice, you should be able to find a reasonable fucus to determine if you need an extension tube. You should of course be very careful not to drop anything!

Edited by UniversalMaster, 07 June 2020 - 11:36 PM.


#10 astroflak88

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Posted 08 June 2020 - 08:18 PM

Ok i saw in another forum people removing the lenses from the camera, is that what I need to do? I didn't remove my lenses (the ones where you can adjust to make the camera focus and what not)



#11 UniversalMaster

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Posted 08 June 2020 - 11:49 PM

The asi385mc does not have a lens, so I'm not sure what you mean. The camera should be fitted with the supplied 1.25" adapter and when connected to the Quark where you put the eyepiece.

#12 astroflak88

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Posted 09 June 2020 - 01:03 PM

This one
583b393ab1ed181b908c5c6f31182b67.jpg

Edited by astroflak88, 09 June 2020 - 01:04 PM.


#13 hopskipson

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Posted 09 June 2020 - 01:09 PM

That’s your problem. You only use that lens for an all sky view. Just use the supplied nose piece.

#14 UniversalMaster

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Posted 09 June 2020 - 02:25 PM

Oh that one, that is just a (really poor) "meteor lens" asi supplies with the camera. You need to unscrew the lens and the black ring and screw in the 1.25" nose-piece also supplied with the camera.

#15 astroflak88

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Posted 09 June 2020 - 08:16 PM

Looks like I am getting somewhere. I was able to get the calcium h quark to focus using a reducer but tried with the quark h alpha gemini and couldn't get it to focus on sun. =\

#16 UniversalMaster

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Posted 10 June 2020 - 12:03 AM

Try going back to the top of this thread and go through all the suggestions again. I don't think anyone considered that you had that lens mounted wink.gif


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