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Thread: Star gazing

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    Super Moderator NEF.D90's Avatar
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    Star gazing

    Hey I just walked out side and saw a beautiful stary sky out tonight. I want to catch some of it in a photo. Can my d90 do it with my 18-55 at F3.5?
    If your going to dream, Dream Big!

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    Super Moderator NEF.D90's Avatar
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    so I stepped out side set the D90 to 30" and the ISO to 3600(max)

    then I switched to my 70-300 at F/4.0


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    Administrator Aloicious's Avatar
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    astrophotography is a lot of fun, but it takes some understanding more than just general photography because you have to factor in the rotation of the earth in relation to the celestial object you're shooting and factor that against your focal length, this is why you're getting much more blur with your 70-300 than you are with your 18-55. Tripods are pretty much mandatory. and your lens and body is fine (sure faster lenses and better bodies would open up some options, but your d90 and 18-55 are both great to start with), but it takes practice getting things right. plus, where you are at will make a big difference, light pollution and poor viability can make things much more difficult

    here's a stitched collage of images of the milky way taken with the super cheap nikon 50mm f1.8D I used to have:
    -Justin

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    Administrator Aloicious's Avatar
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    in fact, I think that was taken when I had my D90 too.
    -Justin

    Bodies - D800E
    Lenses - Sigma 18-35 f1.8 DC | Zeiss 15mm f2.8 ZF.2 | Zeiss 21mm f2.8 ZF.2 | Sigma 35mm f1.4 Art | 105mm f2.5 AI-S | 70-200 f2.8G VRII | 200mm F4.0D Micro AF | 300mm f2.8 VRII

    My PhotographyWild Blog

    C&C is always welcome on the images I post.

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    Super Moderator NEF.D90's Avatar
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    I can't believe how much the earth moves in 30 seconds lol. so how is that compensated for?

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    Administrator Aloicious's Avatar
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    there are a few different ways, either you need a motorized mount or something that moves at the same rate opposite of the earth's rotation (sidereal rate) and is aligned correctly to the celestial poles...or if you just want to use a lens on a tripod, you can adjust the shutter speed to be fast enough that the movement won't be noticeable in the frame, this can be roughly calculated with the 'rule of 600' formula:

    600/(lens focal length * (1 for FX, 1.5 for DX)) = shutter speed in seconds

    so if you're using a FX body, with a 24mm lens, you would do: 600/(24*1) = 25s shutter speed

    if you're using a DX body with a 50mm lens, you would do: 600/(50*1.5) = 8s shutter speed

    if you zoom way out to 300 on a DX body you would do: 600/(300*1.5) = 0.667s shutter speed

    since the longer the focal length and the smaller your angle of view, the shorter your shutter speed needs to be to eliminate trailing motion in the starts.
    -Justin

    Bodies - D800E
    Lenses - Sigma 18-35 f1.8 DC | Zeiss 15mm f2.8 ZF.2 | Zeiss 21mm f2.8 ZF.2 | Sigma 35mm f1.4 Art | 105mm f2.5 AI-S | 70-200 f2.8G VRII | 200mm F4.0D Micro AF | 300mm f2.8 VRII

    My PhotographyWild Blog

    C&C is always welcome on the images I post.

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