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Canon 100-400 effective length

post #1 of 15
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Hey guys. I'm going to the shuttle launch and I'm planning on renting a telephoto lens. I believe I'll be somewhere between 1 and 2 miles away from the shuttle. I was considering the 100-400 since it's a zoom and is Canon's longest zoom. I have a 50D, so it'll actually be 640mm on the long end. Will this be enough or will I need something insane like an 800mm? Thanks.
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post #2 of 15
How about a teleconverter? that would make it about f/8 though iirc
 
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post #3 of 15
It will actually be 400mm on the long end. You're confusing FOV crop with focal length.
post #4 of 15
Quote:
Originally Posted by sub50hz View Post
It will actually be 400mm on the long end. You're confusing FOV crop with focal length.
What he said.
post #5 of 15
theres no reason to get a zoom unless you are going to be REALLY close to the launch pad and need the flexibility of a zoom....rent a 400/5.6i ts going to be far sharper then a 100-400. and if you need more reach get a 2x or 1.4x teleconverter.
Edited by mz-n10 - 3/21/11 at 12:00am
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post #6 of 15
Quote:
Originally Posted by mz-n10 View Post
theres no reason to get a zoom unless you are going to be REALLY close to the launch pad and need the flexibility of a zoom....rent a 400/5.6i ts going to be far sharper then a 100-400. and if you need more reach get a 2x or 1.4x teleconverter.
that although i wish i knew how far a 400 actually reaches never tried one before. but i imagine it can reach all the way down a soccer field since my friend was shooting a game with me and was getting great captures from down the field. while i could on get shots of the when the players were close to me... and this is why we need canon and nikon to team up and make the 24-500 f2.8 IS USM
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post #7 of 15
Quote:
Originally Posted by Conspiracy View Post
and this is why we need canon and nikon to team up and make the 24-500 f2.8 IS USM
I would trade my soul for that lens.
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post #8 of 15
Quote:
Originally Posted by BlankThis View Post
I would trade my soul for that lens.
I'd trade more than that: try my first kid!
post #9 of 15
Thread Starter 
Quote:
Originally Posted by sub50hz View Post
It will actually be 400mm on the long end. You're confusing FOV crop with focal length.
If I understand correctly, the crop makes it seem as if I'm viewing the center part of the equivalent of a 640mm lens of a full frame.

At any rate, does anyone actually know the useful range of a 400mm,500mm, and the 800mm just for comparison? I believe the 800mm is good for about 4 miles.
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post #10 of 15
What do you mean exactly? "Useful range" is entirely relative.
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