3 replies to this topic

[MarioJumanji]

I got out the PST today to try some solar imaging, and I'm pretty happy with the result. But there is a darkish, thumbprinty spot in the image (I can see it in the videos I took) and I'm wondering what is the likely cause. Is this dust on the camera perhaps? I'm using a ZWO ASI385MC.

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Edited by MarioJumanji, 26 May 2023 - 06:05 PM.

[gstrumol]

My guess is that you raised the exposure too high and the center blew out a bit. I think it's a postprocessing issue. Also, the sunspots are a bit too prominent, making me think the tuning on it is not quite on-band.

 

Here is my PST image from this morning, using a Canon T7 DSLR:

 

 

showing it in normal and inverted view.  A comparison to a GONG photo, and a colorized version of the above is here:

 

Edited by gstrumol, 26 May 2023 - 06:51 PM.

[MarioJumanji]

My guess is that you raised the exposure too high and the center blew out a bit. I think it's a postprocessing issue. Also, the sunspots are a bit too prominent, making me think the tuning on it is not quite on-band.

 

Here is my PST image from this morning, using a Canon T7 DSLR:

 

att2.jpg

 

showing it in normal and inverted view.  A comparison to a GONG photo, and a colorized version of the above is here:

 

att1.jpg

Definitely overexposed a bit, but I'm talking about the dark smudge above the center if you can see it. It's visible in the raw AVI so it didn't come from processing.

 

Edit- I took the camera and gave it a stern looking at, sure enough I found a tiny piece of lint or something on the glass. Hopefully I can get a better result tomorrow

Edited by MarioJumanji, 26 May 2023 - 07:05 PM.

[gstrumol]

Oh I see it now! Yeah, that is strange. But still, if you're seeing penumbra around the spots in a Ha scope, something's off. Try adjusting the tuning ring. And good luck!

 

As Scarlett O'Hara once said: "Tomorrow is another day"