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Astrophotograpy and Star Trackers
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<blockquote data-quote="BF Hammer" data-source="post: 741945" data-attributes="member: 48483"><p>Orion Nebula is actually a lot brighter in the sky than Andromeda. It is naked-eye visible in a suburban setting, possibly urban too. It looks like a star until you use some magnification. You can treat it like Andromeda galaxy mostly, but definitely can turn down the ISO a bit to avoid over-exposing. I shot it at full 600mm available in my 150-600mm lens, but it takes up nearly 1/4 of the frame. In winter is the time it is typically photographed. And explore the area around Orion with Stellarium or SkySafari, there are many more nebulae of various magnitude. A couple are potential targets from a dark location with a camera lens. Look up the magnitude of the target. Higher real numbers mean dimmer. I think Polaris is the reference magnitude at about 0, and dimmer objects are higher numbers, brighter objects get a negative number. Dimmer means harder to locate, longer exposures and possibly higher ISO needed.</p><p></p><p>I sort of want to target Triangulum (the Spiral Galaxy, Pinwheel Galaxy) soon. It a bit east and down from Andromeda in the evening sky, Andromeda being magnitude 3.3, Triangulum is 5.8 so more ISO needed. I tried to find it my last night out at the end. My goto mount actually pointed at it perfectly, but I could not quite make out anything on my camera screen. I thought I may be pointed wrong. But when I reviewed the 3 test photos at home (15 seconds long) I could just make out something galaxy-like. I feel stupid now for having such a perfect alignment without a correction and not know it. I could have gone higher on ISO and set for 60 second exposures and I bet I would have had my image.</p></blockquote><p></p>
[QUOTE="BF Hammer, post: 741945, member: 48483"] Orion Nebula is actually a lot brighter in the sky than Andromeda. It is naked-eye visible in a suburban setting, possibly urban too. It looks like a star until you use some magnification. You can treat it like Andromeda galaxy mostly, but definitely can turn down the ISO a bit to avoid over-exposing. I shot it at full 600mm available in my 150-600mm lens, but it takes up nearly 1/4 of the frame. In winter is the time it is typically photographed. And explore the area around Orion with Stellarium or SkySafari, there are many more nebulae of various magnitude. A couple are potential targets from a dark location with a camera lens. Look up the magnitude of the target. Higher real numbers mean dimmer. I think Polaris is the reference magnitude at about 0, and dimmer objects are higher numbers, brighter objects get a negative number. Dimmer means harder to locate, longer exposures and possibly higher ISO needed. I sort of want to target Triangulum (the Spiral Galaxy, Pinwheel Galaxy) soon. It a bit east and down from Andromeda in the evening sky, Andromeda being magnitude 3.3, Triangulum is 5.8 so more ISO needed. I tried to find it my last night out at the end. My goto mount actually pointed at it perfectly, but I could not quite make out anything on my camera screen. I thought I may be pointed wrong. But when I reviewed the 3 test photos at home (15 seconds long) I could just make out something galaxy-like. I feel stupid now for having such a perfect alignment without a correction and not know it. I could have gone higher on ISO and set for 60 second exposures and I bet I would have had my image. [/QUOTE]
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