Why is it that my phone doesn't capture details my eyes see in H Alpha?

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Solarscout
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Why is it that my phone doesn't capture details my eyes see in H Alpha?

Post by Solarscout »

July 10 Sun through 50mm Lunt. However my phone images are as not as red or clear as what my eyes can see. The Sun is a deeper red through my eyepiece and I saw prominences or flares that do not appear at all in my photos.

Anyone else try to capture H alpha images through their phones?
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Re: Why is it that my phone doesn't capture details my eyes see in H Alpha?

Post by DeepSolar64 »

It's quite tricky to get Ha good through a smartphone and I have never been able to approach what my eye or a dedicated monochrome astro camera will do but you can get acceptable results with persistence. On these you are overexposed which burns out any details present. It's tricky to get the built in camera software to expose and focus the image precisely. You might try an app from the App Store that will enable you to manually control the focus and exposure of the iPhone camera. I use one called " Yamara " which enables you to focus and expose manually. I am sure there are others.

Below is my best Ha picture with the iPhone of the Ha disc. I have bettered it on the prominences.

Also use an image editor to bring out details and to change the color, if you wish.

SMII90_iPhone13_HaFD_7-17-22_JP.JPG
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Re: Why is it that my phone doesn't capture details my eyes see in H Alpha?

Post by EricF »

The 4th picture has a few prominences along the bottom edge, but still over exposed.

Keep moving to shorter exposure. Darker image is fine until you get the hang of it. You're almost there.


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Re: Why is it that my phone doesn't capture details my eyes see in H Alpha?

Post by Montana »

Yes, it is very tricky unless you get manual exposure and focus. The eye is much better adapted to balance out the dim and bright together, therefore, if you reduce the exposure so that it is not over exposed, then sometimes the dim proms can disappear. I guess a million years of evolution is better than an iPhone :) I too have noted that colour sensors take Halpha to be a magenta colour rather than red, I am not sure why this is. Perhaps because it is pure red, only the red pixels are being used and there is an introduction of background noise or bleed through into the blue and green pixels. In Photoshop you could delete the bad green and blue layers and keep only the red. This is also why you get a serious reduction in resolution quality as you are only using third of the pixels.

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Re: Why is it that my phone doesn't capture details my eyes see in H Alpha?

Post by DeepSolar64 »

I also find the three lens setup on the iPhone 13 Pro Max harder to use than the one lens of the older iPhone XR. The camera wants to switch between the lenses and the macro must be turned off.


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Losmandy AZ8 Alt/Az Mount
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Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces

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