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FORUMS Photo Sharing & Discussion Astronomy & Celestial 
Thread started 24 Jan 2012 (Tuesday) 13:41
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Do I need f/2.8 for celestial shots?

 
Kasrielle
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Jan 24, 2012 13:41 |  #1

I've moved to the 5Dll from my 50D, and am trying to decide which UWA to go with. I know the 17-40 will work fine for landscapes, since I'll be stopped down to f/8 or smaller. But what about shooting the milky way? Or (if I'm lucky) the Aurora Borealis? For long exposures at higher ISO will I need the extra stop to 2.8? I have stacking software... I'm just trying to decide if the extra cost of the 16-35ll is worth it... Can I get away with f/4?



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hollis_f
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Jan 25, 2012 06:35 |  #2

2.8 is handy but is by no means essential. f4 should give you good results.


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archer1960
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Jan 25, 2012 18:10 |  #3

Yes, what he said.


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Kasrielle
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Jan 25, 2012 19:58 |  #4

Thanks - I appreciate it!



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Do I need f/2.8 for celestial shots?
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