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Old Aug 21, 2013, 1:45 AM   #1
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Default Lens for shooting Milky Way

Just recently got into shooting long exposures to capture the Milky Way and would really like to get wider than my Canon EFS 18-135 on my Canon 7D. Totally confused on using either a 8 mm or a 10-17mm 3.5. Can anyone tell me the pros and cons of the lens you are using or would recommend? Trying to stay within a $300-$600 range give or take. Appreciate any help and ideas. Thanks!
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Old Aug 21, 2013, 4:50 PM   #2
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Fisheye lenses are great for shooting large portions of the sky. Everything's so far away that you won't get any perspective distortion that is typical when using a Fisheye lens with more conventional subjects.

A lens that is, or tries to be rectilinear, might unintentionally distort the true perspective.

You don't need any AF or AE, so the Samyang (et al.) 8mm f/3.5 might be a good choice. There's also the Sigma 15mm f/2.8, or the Tokina 10-17mm f/3.5-4.5, but they're a little over your price range, though the flexibility of the zoom might be worth the extra money.
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Old Aug 23, 2013, 3:31 AM   #3
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i just got a Rokinon (Samyang) 14mm f/2.8. like the 8mm fisheye, it's all manual, no AF/AE, it doesn't even have electrical contacts on the lens mounting ring. but it's surprisingly sharp, with a lot less distortion than the 8mm, and will give you an 89-degree field of view on your 7D - that's from the horizon to straight up overhead. plenty for shooting the Milky Way, etc. it's probably a more useful focal length than the 8mm, too.

i did some informal testing comparing it to the Canon 24-105L for corner sharpness, etc. the Canon lens is brighter, but the Rokinon is nearly as sharp in the corners as the Canon at f/4, and at f/8, it actually looks a little sharper! that's on my 5D Mk II - on your 7D, you won't have any issues at all with the corners. for $339, it's a bargain.

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