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flat frame not being applied  

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(@moviecells)
Red Giant Customer
Joined: 1 year ago
Posts: 87
August 2, 2021 15:55  

@mabula-admin

I am uploading my sky flats i took last week could you check them they are in a folder called LRGB sky flats. I am going out to the telescope to setup for some electro luminescence flats.

Mike

 


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(@moviecells)
Red Giant Customer
Joined: 1 year ago
Posts: 87
August 2, 2021 18:06  

@mabula-admin

Just uploading some electro luminescence flats with matching dark flats could you try those they are in folder called electro luminescence. I am also going to try some plan flat just bu pointing the telescope to a blank wall 

 

Mike

This post was modified 2 months ago by Michael Purver

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(@igor_cheb)
White Dwarf Customer
Joined: 2 months ago
Posts: 12
August 2, 2021 18:45  

@moviecell
Sorry if this is irrelevant, but maybe it's something to check for as well. I have had a similar issue with geometrical illumination artefacts recently that looked like so:

image

 

The cause of the problem for me turned out to be the diameter of the adapter connecting the camera to the scope. I've tried several tubes available and it was very telling:

image

As evident from the diagram even 1 mm counts.

 

This post was modified 2 months ago 2 times by Igor Chebuniaev

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(@moviecells)
Red Giant Customer
Joined: 1 year ago
Posts: 87
August 2, 2021 19:18  

@igor_cheb

 

Hi thanks for the message i am open to any ideas to found out whats going on. I will check this out but i am running 2 inch {50mm} all the way from the camera with 2 inch filters right up to the 2 inch on the back of the meade so there should be no way light should be cut off. I even used some black felt to mask the barrels just in case it was a internal reflection some how.

 

Mike


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(@moviecells)
Red Giant Customer
Joined: 1 year ago
Posts: 87
August 3, 2021 19:27  

@mabula-admin

Well has a better day today found last night on a forum a tool to calculate the distance in a optical path a optical problem is. You put in some figures for the camera and the telescope and the size of the optical problem my case the large ring in pixels and it came back with around 66mm from the camera sensor. That put it around the focal reducer took the camera off and point the telescope to the sky and i could see a large ring of light all the way around the final reducer lens.

I stripped the reducer lens out and blacked the edge of the optics then i notice the lens bevel is only just covered by the lens metal work of the barrel so i 3D printed a round lens mask that removes about 2mm around the final reducer lens. This all seems to have helped see image below i have more light loss to the edge because of the 3D mask but i can't see any rings.

I now need to wait for a clear night to take some more new lights to try with the new flats.

masked

Mike


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
August 4, 2021 09:18  

Excellent Mike, sounds like you're close to the actual issue there.


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