5 replies to this topic

[LX200]

I have been getting weird red ring around outside of my shots using RASA 8" and ZWO 183MC

Attached is one flat, debayered and then STF unlinked. 

 

See the red ring on outside?  Went any color in a flat?  I use dew shield on scope, with several white plexiglass sheets over front of dew shield, pointed up to sky. 

 

4 second exposure, gives about 30,000, or mid of histogram. 

 

Why any color bias in flat, unless light is shining on ZWO red camera body and this causes issue???

Attached Thumbnails

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[LX200]

Moire pattern from resizing on phone... Not in original flat

[bobzeq25]

RASA 8 owner for some years. My experience and opinions.

I find color in flats completely irrelevant.

The appearance of flats is irrelevant, all that counts is how they correct the lights.

I've never had any problems with reflections off the camera.

With a 183 you need to carefully collect flats, bias, and darks, or you'll have amp glow.

I switched from 183s to 2600s. In spite of going from image scale 1.2 to 1.9, my images improved. And calibrating the lights became much easier. I just take flats, and bias, and they always work well.

Edited by bobzeq25, 10 November 2024 - 01:41 AM.

[Erlend L]

I don't know if this red color is due to reflections from the camera, but of it is, it must be fixed.

Reflections in the will generally NOT calibrate out correctly.

[sharkmelley]

It's impossible to judge anything useful from the image you posted.  However, it doesn't have the radial symmetry that would be expected from a potential reflection off a red cylindrical camera body.  Upload a raw flat to a file sharing site then it can be carefully examined for potential colour variations.

[Robservatory]

I’ve seen people flock their cameras for this reason. You can buy rolls of black adhesive flocking on amazon. That should help. Make sure you tape over the red light on the back of the camera as well.