Me too. We finally got some rain, so we have clouds.If we can get some clear nights I plan to give it a try![]()
It is cold and damp here right now, but not that cold. I am just not used to cold weather any longer. I never was a fan of cold weather to begin with. Cool image.A quick trip with camera and tripod but it was absolutely freezing to hang about using the app to search for planets
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Nice shot! It looks like you shot with a wide lens. However cold it was, you did get a very clear night sky there. Wonder how you get those star spikes in the sky?A quick trip with camera and tripod but it was absolutely freezing to hang about using the app to search for planets
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I have now idea how the spikes appearedNice shot! It looks like you shot with a wide lens. However cold it was, you did get a very clear night sky there. Wonder how you get those star spikes in the sky?
Looks like some kind of lens distortion. It is worse on the edges, which is what you expect in a wide angle lens. The spikes also change direction around the perimeter, which is also what you expect to see. Looks like your copy produces some spiking further into the image. It took me a couple minutes to locate a pattern that kind of looks similar to what you are getting. I am wondering if you have a bad copy of that lens.I have now idea how the spikes appeared. Maybe someone might know.
Thanks for the reply. It is a fairly cheap lens I was using (Tokina 11-16) at 16mm on a Full Frame body, so your explanation is probably correct.Looks like some kind of lens distortion. It is worse on the edges, which is what you expect in a wide angle lens. The spikes also change direction around the perimeter, which is also what you expect to see. Looks like your copy produces some spiking further into the image. It took me a couple minutes to locate a pattern that kind of looks similar to what you are getting. I am wondering if you have a bad copy of that lens.. If you point the lens directly at a bright star, do you get those diffraction looking spikes in the middle of the lens? I think the exagerated pattern on those very bright stars are just from the star being stretched out (coma) from being on the outer edge of the FOV. That is my best guess on what is going on here anyway. I make no guarantees regarding my amateur opinion about optics.
Image below from https://www.lonelyspeck.com/a-pract...rations-and-the-lonely-speck-aberration-test/
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Ah, that would explain a lot there.Thanks for the reply. It is a fairly cheap lens I was using (Tokina 11-16) at 16mm on a Full Frame body, so your explanation is probably correct.