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Old Mar 9, 2005, 5:59 PM   #11
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oh.. you mean my 5 POUND Sigma 120-300 f2.8 EX... the one that takes both hands to hold? :lol: The one that takes pictures like this from across a poorly light arena?



Really, sjms, it just a little joke NHL started with me... about me saying IS is for sissys...

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Old Mar 9, 2005, 6:17 PM   #12
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sjms wrote:
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http://www.pbase.com/crusader/image/23291403

this was taken 2 years ago with the following gear

EOS1Ds handheld distance approx 75 yds at 280mm

70-200 f2.8L IS USM with a 1.4x extender II
Did I read this right??? 1/640s @ f/6.3 - is IS really neccessary :?:
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Old Mar 9, 2005, 7:49 PM   #13
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yep. i was running too.
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Old Mar 9, 2005, 7:59 PM   #14
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http://www.pbase.com/crusader/image/39263760

shot for the local NJ papers.

had to use the flash. i set up for the sodium lights in the gym and then they turned them all off except of the center single lamp over the circle. not photo friendly
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Old Mar 9, 2005, 8:14 PM   #15
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Shot for fun... handheld, no IS, Sigma 70-200, ISO3200, f2.8 @ 1/100sec.... standing in the bleachers... :G



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Old Mar 9, 2005, 10:10 PM   #16
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sjms wrote:
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yep. i was running too.
How fast can a person run? Supergirls can do 10 mph top - double that max if you're running too - Compare to this image that was shot with no IS (the Sigma 120-300 f/2.8 doesn't have any!) @ only 1/250s: http://www.stevesforums.com/forums/v...c.php?id=30682

This faster(20x) car was shot even slower still @ less than 1/180s from the same lens with no IS !!!
http://www.stevesforums.com/forums/v...c.php?id=32296


IMO 1/640s doesn't justify IS, most standard lenses can shoot at that EV... and be pretty sharp @ f/6.3 - In fact one can double the speed to 1/1200 @ f/4.5 for the same EV and IS would be even less important
-> 1/64s would be a WOAAA! but 1/640s is a bad choice to promote IS :idea:

I prefer Mr_Saginaw not so 'sissy' technique over IS any day :-) :lol: :G
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Old Mar 10, 2005, 5:28 AM   #17
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On another topic: http://www.stevesforums.com/forums/v...54&forum_id=37
sjms wrote: "do not use on a tripod as it can/will reduce the image sharpness due to it trying to sense the movement."

I wonder if that's true... of course, mounted on tripod you can deactivate IS... but what if I do forget?
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Old Mar 10, 2005, 8:04 AM   #18
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pauza

IS can create movement out of stillness - ie it can induce a projected image on the film plane to move when there's no camera 'shake' such as when a camera is resting on a sturdy platform. Newer lenses have an auto-switch in the firmware which will disable the IS below a certain frequency threshold...

In the above panning example the relative movement between the car/camera is constant whereas the background is moving - With the IS in the horizontal plane enabled, the lens will correct the image to fix the background to a stand still (ie negate the camera horizontal movement) and blur the car instead, which is the opposite of the desired effect :?

Don't get me wrong IS is very effective to enable shooting at lower shutter speed when handheld on still subject which is what folks tend to forget - On long telephoto (600mm or higher) it is particularly useful because lower shutter speed such as 1/300s can still freeze a lot of birds on land, but as the focal lenght decreases the resulting minimum shutter speeds are getting so slow that their effectiveness is reduced to static objects... When a subject(s) is moving there's nothing that IS can do (wireless sensing in the future may be ).
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