I am going to buy a new lens for Aurora/Meteorite/Milky Way.
I have 7d and 5diii.
I have 17TS/f4, 85 1.2 v2 , 24-70f2.8 v1.
17ts/f4 is slow for aurora and meteorites. 30s exposure at iso3200.
85 is not really sharp at f1.2 until f2.8 and too zoomed. Okay for sometime.
24-70f2.8 is a comparible to 17/ts at 2.8 but still a little slow. My best compromise.
I am debating between:
max s open equiv IQ
600/mm expos.
Canon TSE/17 35s F4 @F4 30s [reference]
Zeiss 21 29s f2.8 @f2.8 15s marginally better than reference @
Canon 24 25s F1.4 II @2.8 15s marginally better than reference
Zeiss 25 24s F2.0 @2.0 7.5s marginally better than reference
Canon 16-35 38s F 2.8 II @F4 30s equal to reference
Canon TSE/24 25s F3.5 @F3.5 25s significantly better than reference
Canon 85 7s F1.2 II @2.8 15s equal to reference
Canon 24-70 25s f2.8 @2.8 15s equal to reference
The above table is my read of thedigitalpicture.com quality equivalency for
Camera, max time to star trails based on 600/mm, max fstop, fstop where IQ is comparable to TS17, and equivalent exposure based on 17tsf4.
I am leaning toward either 24 F1.4 II or Zeiss 25 2.0.
Obviously 24 F1.4 is capable of a much shorter exposure when IQ is sacrificed.
Any suggestions?
Any thoughts are appreciated.
Scott
[woops -obviously tables don\'t work well copying and pasting. I will put in a jpg this evening.]
Aug 15, 2012 at 02:12 PM
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