Here is a trick to make your screen red all the time, so no need for red gel over the screen. https://ios.gadgethacks.com/how-to/keep-your-night-vision-sharp-with-ios-10s-hidden-red-screen-0173903/
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Bill Tschumy Thanks for passing along this hint to others. I will mention that this is still not as good as using red film over the screen. The screen on iOS devices has some light leakage around the pixels. This light is *not* colored. You can see it most easily by looking at the screen from an angle. A diffuse glow will be emanating from the screen. This will hurt your dark adaptation at a dark site.
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btsloan123 I see what you mean, I took my iphone and ipad into my closet to check it out. Very dim glow, can't say it would or wouldn't hurt your dark adapted vision. I personally use a coral colored gel which has been fine at TSP. As soon as apple starts using OLED screens this glow will be history. I saw SkySafari on a Samsung tablet and it looked great, blacks were black and not washed out as on the iPad.
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Bill Tschumy That glow starts to look worse when you are fully dark adapted. You are right that OLED screens don't have this issue. I will be very happy when Apple makes the transition.
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btsloan123 As soon as there is an OLED iPad to be had, I am going straight to the Apple store and getting one. I am bothered that Apple has taken so long to switch, they used to be cutting edge, not anymore.
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