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Thread started 04 Jul 2012 (Wednesday) 08:53
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Is a long exposure in bulb mode possible on a boat?

 
rrblint
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Jul 04, 2012 22:26 |  #16

noisejammer wrote in post #14671659 (external link)
There are companies that rent out isolation platforms for helicopter filming - I'm pretty sure one of these would work.

There's a caveat... getting really sharp images requires world class accelerometers, closed loop control and careful balancing. This is expensive. We've built such a machine at work that's good enough to mount a telescope on and fly it in very turbulent air ... but there are 6 zeroes in the price tag and the first digit is not 1.

On an amateur budget, I think it maybe quite feasible if you can construct a gimballed mount to isolate you from the boat's motion. Provided the boat's not accelerating (apart from vertically,) you can deal with pitch, roll and yaw by suspending a large "+" shaped mass on a stiff rod under the camera's CoG and allowing it to swing. Light damping - as close to critical as you can get - would be a good idea.

Phew!...That's a fair amount of trouble and expense just to get some night sky shots.;)


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kjonnnn
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Jul 04, 2012 22:50 |  #17

mustang0672 wrote in post #14669173 (external link)
Is this possible? I will be using a 100-400 and my 24-105mm.

Yes it's possible.
But your image will be a blurred.

What are you trying to take an image of on a boat with Bulb?




  
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kjonnnn
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Jul 04, 2012 22:51 |  #18

siginu wrote in post #14669323 (external link)
Yes, if your subject is also on the boat.

If you've even been on a boat, different parts of the boat don't go up and down together. pitch and roll




  
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Bill ­ Boehme
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Jul 05, 2012 00:10 |  #19

kjonnnn wrote in post #14671864 (external link)
If you've even been on a boat, different parts of the boat don't go up and down together. pitch and roll

Sounds to me like somebody was running a loose ship. :lol:

Its motion with respect to the outside world is irrelevant when there is no observable motion between any two points that are both on the ship/boat (rubber rafts excluded).


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Jul 05, 2012 00:26 |  #20

wayne.robbins wrote in post #14671752 (external link)
Even if I tried to cheat- using 6 zeros -$20,000.00 is still too rich for me.

He didn't say anything about there being a decimal point in there anywhere.... :lol:




  
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lensfreak
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Jul 05, 2012 05:45 |  #21

yes if the the boat is out of the water on land.

cmon dude, think about it, the boat aint gunna stay still enough to use bulb.




  
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Gel
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Jul 05, 2012 05:50 |  #22

Is the boat on a tripod?


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Jul 05, 2012 05:51 |  #23

You could get some cool photos with a wide angle lens mounted on a tripod in a boat. The boat would be in focus and everything else would be effected by movement blur.. which could be quite artistic.


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kjonnnn
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Jul 05, 2012 13:05 |  #24

Bill Boehme wrote in post #14672097 (external link)
Sounds to me like somebody was running a loose ship. :lol:

Its motion with respect to the outside world is irrelevant when there is no observable motion between any two points that are both on the ship/boat (rubber rafts excluded).

I love to see some sharp long exposure images made in a boat. Can you point to some?




  
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gofer
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Jul 05, 2012 13:11 |  #25

Bill Boehme wrote in post #14672097 (external link)
Its motion with respect to the outside world is irrelevant when there is no observable motion between any two points that are both on the ship/boat (rubber rafts excluded).

^ This. Movement is relative and if the subject moves on the same platform as the camera then that movement becomes irrelevant.


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Jul 05, 2012 13:16 |  #26

Gel wrote in post #14672760 (external link)
Is the boat on a tripod?

Would you use a ballhead, panning head, or gimbal for this application?


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kjonnnn
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Jul 05, 2012 13:24 |  #27

gofer wrote in post #14674269 (external link)
^ This. Movement is relative and if the subject moves on the same platform as the camera then that movement becomes irrelevant.

But believe that would apply if the camera and the object are "stabilized" to the boat, and all 3 at moving as one. The movement of the boat would be irrelevant, relative to the two "objects" (camera and subject). But PEOPLE on a boat move and sway by inertia and momentum enough to not get a sharp image on a long exposure, which is what this thread is about. But the OP hasn't exact said what they are trying to photograph, unless I missed it.




  
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noisejammer
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Jul 05, 2012 14:56 |  #28

rrblint wrote in post #14671789 (external link)
Phew!...That's a fair amount of trouble and expense just to get some night sky shots.;)

I didn't say that's what we're using it for ;)


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rrblint
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Jul 05, 2012 20:25 |  #29

noisejammer wrote in post #14674752 (external link)
I didn't say that's what we're using it for ;)

I meant for the OP...I'm sure that your work justifies the trouble and expense.


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Is a long exposure in bulb mode possible on a boat?
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