Ckw From UK - England, joined Aug 2010, 654 posts, RR: 17 Reply 10, posted (9 years 7 months 2 weeks 1 day 10 hours ago) and read 3016 times:
Canon says IS single mode does not work for panning. People above say it does, and have results to prove it. What's going on?
There are a few possibilities:
1 - IS doesn't work with panning, and the fact that panned shots with IS turned on exist is simply a credit to the photographer's skills - ie. the same results would have been achieved without IS turned on.
2 - Canon don't know what they're talking about
3 - A misunderstanding or misrepresentation of how IS works. I believe IS is achieved through the use of accelerometers - ie, the system detects changes in motion, not motion itself. If this is true, then the moment you begin to pan, the acceleration will be such that it causes the IS to stop working. However, once up to "panning speed", the motion becomes constant and any variations (shake) will fall back into the IS parameters, and hence a constant motion can indeed be stabilized. In short, provided you don't try and shoot at the start of your panning swing, you may be OK.
The difference between this and a mode 2 lens, is that in the later case either horizontal or vertical accelerations can be ignored altogether making the lens tolerant of variations in the panning speed - and avoiding a "danger zone" at the start of a pan.
I don't have a single mode lens to test this with, but perhaps someone else would like to experiment. I think it is highly unlikely that Canon are incorrect in their description of IS, but I do think it is possible for photographers to intentionally or accidentally develop techniques which allow equipment to be used outside the design parameters.
Staffan From , joined Dec 1969, posts, RR: Reply 13, posted (9 years 7 months 2 weeks 1 day 3 hours ago) and read 2961 times:
I think Colin is more or less right with option 3. I don't however think that IS turns off when you start panning, but instead it tries to compensate for the acceleration in the horizontal plane at the beginning of the pan, which can foul up things for the photographer. Then, once you are panning with constant speed it should work fine and any variations in panning speed will be counteracted by the IS as long as they are small enough.
JeffM From United States of America, joined May 2005, 3266 posts, RR: 52 Reply 14, posted (9 years 7 months 2 weeks 1 day 3 hours ago) and read 2961 times:
All gyros respond to changes in motion. It is what and how they handle that change that makes them useful. An accelerometer is more or less a neutrally balanced mass that only measures a change in velocity. A gyro on the other hand, does not react to changes in velocity, but rather movement about it's sensitive axis.
Staffan From , joined Dec 1969, posts, RR: Reply 15, posted (9 years 7 months 2 weeks 1 day 2 hours ago) and read 2956 times:
Hmm, got me thinking.. if it indeed is a gyro, it will most likely "max out" at one end of its moving range if you start panning with it activated. If that doesn't cause it to switch off it will probably give the same effect as having it switched off (since it can't move any further) with the only difference that it will still work in the vertical plane.
JeffM From United States of America, joined May 2005, 3266 posts, RR: 52 Reply 16, posted (9 years 7 months 2 weeks 1 day 2 hours ago) and read 2952 times:
A gyro can sense movement 360 degrees about it's axis. I have never heard of a gyro being "maxed" out. What good would that be? Don't forget there is probably mechanical and software limits imposed on the range of movement on the movable glass elements.
ExitRow From , joined Dec 1969, posts, RR: Reply 18, posted (9 years 7 months 2 weeks 1 day 2 hours ago) and read 2948 times:
I decided to play with the 70-200mm 2.8L IS + 2x yesterday.
I wanted to see how slow a shutterspeed I could go with this combo and still get consistent results.
These three were shot at 1/60th.
That was about as slow as I would want to go handheld. With a monopod or tripod I am sure I could go down to 1/45th.
The effects of IS in panning are still undecided to me. The lens I was using had the Dual Mode IS. I was in Mode 2 for all these shots. I also own the 28-135mm USM IS and I have learned to turn the IS off for panning. I can actually feel the gyros pegging when I pan. Results are relatively inconsistent. I still usually only get one or two usable frames out of a burst of 8. I think the Dual Mode IS in the L lenses is far better calibrated than the 28-135 though. The former lens, I believe, is designed for zoomed out camera shake only.
I think the best way to achieve good results is indeed all in your hands. Literally. I think IS helps, but having a steady hand and a smooth pan is the best "trick."
ExitRow From , joined Dec 1969, posts, RR: Reply 19, posted (9 years 7 months 2 weeks 1 day 2 hours ago) and read 2938 times:
Oh and to answer the thread starter question:
Is it worth it to spend the money on IS 75-300 or spend half that and by a typical 75-300.
Buy the best lens you can afford. IS is always a plus in my book, especially at the farther end of the zoom. Though, I think IS is best suited to low-light, F2.8 work. That's why I am thinking of buying this lens. I do a lot of low-light photography in my commercial work and this lens is a MUST. Twice now I have wanted to rent it for jobs and it's been reserved already. I need it in my bag. Shots like this would be impossible without IS.
This lens will pay for itself in no more than two jobs.
As for aviation photography, well... again, if it's hi-key conditions, the advantages of IS are negligable. If you're shooting in darker conditions and want to maintain a high ISO, it's a must.
Staffan From , joined Dec 1969, posts, RR: Reply 20, posted (9 years 7 months 2 weeks 1 day 1 hour ago) and read 2933 times:
Jeff, since there is no use in having a group of lens elements rotating 360 degrees, I don't see why the gyro should either.
I would imagine, that when IS is activated the gyros will be centered in planes parallell to the direction the lens is pointing, with the moving lenses also centered. When the lens is moved in another direction (ie shake), the gyros will move the IS lens group to counteract it. Since there is a limit to how much that lensgroup can move before you'll get a distorted image and I'd assume the lenses are mechanichally blocked from moving beyond that limit.
So, when they hit that position what happens? Do the gyros disconnect from the lens group or does the blocked lens group prevent the gyro from moving any further? My guess is the latter. All speculations, but it would make sense.
Maiznblu_757 From United States of America, joined Mar 2002, 5112 posts, RR: 51 Reply 24, posted (9 years 7 months 2 weeks 19 hours ago) and read 2877 times:
Just because it is IS doesnt mean you can totally rely on the IS feature to bail you out so to speak, in certain situations. As Colin stated, you have to develop your skills. We all probably have minor differences in our technique using the IS feature. Image Stabilization is an excellent technology and when used correctly, will allow you to push the limits of the aviation photography envelope.
After shooting fast movers for a day, I am drained from concetrating so much on my panning speed etc. Sounds easy, it is not. Panning to slowly or to quickly will effect the photo. A perfect pan will most often yield a perfect result. This lens sucks as much as any long focal length lens when it is windy, although, you have a bit of a chance with the IS feature, it will not completely save you.