Guillaume paris2
Senior Member
Guillaume
http://www.at-sight.com
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What is the fasination with in body IS ?
- Thread starter Stocky72
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Guillaume paris2
Senior Member
Just where in the world have you spent the last 12 months, to never have heard of Minolta's breakthrough technology??
It's breakthrough because they're moving the sensor, which was impossible with film...
Guillaume
http://www.at-sight.com
Guillaume paris2
Senior Member
as they will produce conteracting movements that will add up... The Sigma lens with OS will try to project a stationary image onto a supposedly fixed sensor, but... AS will be moving it!!
I'd love to see a picture taken with this setup (but then, which owner of a D7D with AS would ever buy a lens with OS?)
Guillaume
http://www.at-sight.com
I'd love to see a picture taken with this setup (but then, which owner of a D7D with AS would ever buy a lens with OS?)
Guillaume
http://www.at-sight.com
Not "even AF", it was Contax' solution to AF. The entire mirror section with film and all moved forwards and backwards to focus, enabling the use of manual focus lenses (and fix focus, although I don't imagine the latter were ever considered).
krusadr
Senior Member
Which is more recognizable as the word "research" ; rscheearch or rccsareheh? How about "amazing" ; amzanig or ainzamg?
This is not such an impressive demonstration if the letters aren't arranged quite so conveniently to make the words recognisable. Here is another equally valid arrangement of that first part. Iif you hadn't read the first version would you have deciphered this quite so easily?
Aincodcrg to a rccsareheh at Cadirgbme Ueviintsry, blah blah
Finiuckg ainzamg huh?
The fact is that like statistics, it is easy to get the result you want by careful posing of the question of sample.
Also, it is hardly true to say that the only thing that matters is that the first and last letters are in place. There's the small matter of all the other letters having to be present too and no extra or erroneous ones there either. People who can't spell aren't likely to have all the exact correct letters there with the first and last correctly placed.
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Vance Zachary
Veteran Member
I regularly shoot with Canon 20D with IS lenses and K-M 7D with in camera Anti-Shake and have some perspective on this matter.
1) not everyone needs IS or Anti-Shake and neither is as good or efficient as a good sturdy tripod or monopod; it is understandable that some shooters would wonder what all the hoopla is about
2) IS in the lens, in my experience, is slightly more efficient than in the body Anti-Shake, especially with longer focal length lenses
3) Anti-Shake of the 7D opens up a whole new world of photography that simply isn't available to Canon shooters unless they break out the monopods (and I am a Canon shooter). Having Anti-Shake with the Minolta 85/1.4 lens or the Minolta 50/1.4 lens allows handheld shooting down to about 1/4th of a second depending on how steady your hand is.
If you don't often have need to shoot under these conditions, you are going to wonder why all the hoopla.
4) Having in camera AS allows those of us available light shooters to use smaller, faster (wide maximum aperture), lighter, less expensive lenses.
It basically comes down to how you like to shoot. That's all.
Cheers!
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Vance Zachary
http://www.pbase.com/photoworkszach
http://www.photoworksbyzachary.com
1) not everyone needs IS or Anti-Shake and neither is as good or efficient as a good sturdy tripod or monopod; it is understandable that some shooters would wonder what all the hoopla is about
2) IS in the lens, in my experience, is slightly more efficient than in the body Anti-Shake, especially with longer focal length lenses
3) Anti-Shake of the 7D opens up a whole new world of photography that simply isn't available to Canon shooters unless they break out the monopods (and I am a Canon shooter). Having Anti-Shake with the Minolta 85/1.4 lens or the Minolta 50/1.4 lens allows handheld shooting down to about 1/4th of a second depending on how steady your hand is.
If you don't often have need to shoot under these conditions, you are going to wonder why all the hoopla.
4) Having in camera AS allows those of us available light shooters to use smaller, faster (wide maximum aperture), lighter, less expensive lenses.
It basically comes down to how you like to shoot. That's all.
Cheers!
--
Vance Zachary
http://www.pbase.com/photoworkszach
http://www.photoworksbyzachary.com
Someone with a Dynax 7 Film?
To work, one system would of course have to be off and the other on, and it would be a way to find out, if there really is much difference between the two.
severoon
Senior Member
The point is that you get it automatically for all your lenses without having to spend extra money on each lens. Think about how much it costs to upgrade all Canon non-IS lenses to IS lenses, and then think about how many lenses Canon makes for which this upgrade is not even possible and you'll start to see why in-body IS makes a lot of sense.
Well, the image sensor is only "moving" relative to the camera body and your shaky hands. Actually, the idea is to mount the camera sensor on a free-floating, gyro-stabilized platform so that it stays in one place and the camera jerks around independent of it. Keep in mind that the idea of IS is image "stabilization"--that is, to stabilize something is to make it not move.
Right--this is precisely why IS is good. It's way easier to get a sharp picture when you're trying to capture the image on a stationary sensor...as opposed to one that jumps around every time your heart beats, you take a breath, have a random muscle fiber twitch, etc.
It's the 1x-3x macro zoom. That's a specialty lens that, IIRC, cannot focus to infinity; it is intended for scientific and repro work. Huge magnification, hard to stabilize, no need for AS.
There is another lens that won't work, according to Minolta, and that's the fisheye. I guess even the small AS movements can lead to unsharpness resulting from the extreme geometry of the lens, but I can't tell as I don't own the lens.
I own lenses in the range of 17 to 500 mm, plus tele converters, and AS works as advertised at long focal lengths and better at short.
Absolute hogwash. How many times have the ribbon cable in your hard disk drive failed?
Actually, no one has "reported" that. Rather, the opposite has been reported from people with actual access to long lenses (i.e. NOT Phil Askey, who made unsubstantiated claims based on flat-out guessing in his review of the 7D). Two to three stops improvement is the norm, meaning it works.
Well, your impression is wrong.
In addition to that, the system you speak of would only be possible with extremely high readout, basically 6Mp at 30-60fps. No sensor can manage this for now.
And there is no possibility for sub-pixel accuracy, which means the electronic anti-shake you speak of would be most precise at really high resolutions -- but then the amount of data shuffled would be huge.
cgbier
Senior Member
There will be a different frequency of movement than in a Harddrive.
Engineering 101: Whatever you plan or build, use as little moving parts possible. That's what I learned some 15 years ago. Maybe "modern times" have xhanged that dogma.
Oh. I am certain Minolta engineers didn't think of this. Better give them a call.
cgbier
Senior Member
Do you know how they solved that problem?
The problem is in your assumptions, and your lack of understanding of the problem. If the ribbon cable would be a problem, it could so easily be tested. Let's say a typical AS operation is 1/30 sec -- and then I'm being generous with time. In one second of continuos operation, you can test the cable for thirty operations. In the time of an extended lunch, you can test how the cable will respond to two hundred thousand exposures -- and that's probably more than the rest of the components (especially the shutter) will stand up to. Do you think they overlooked this lunch-time test?
darkchylde
Forum Enthusiast
Well if you work for Canon or some other camera manufacturer, feel free to share your knowledge with us, so we don't have to assume that much.
Ofc MY opinion is based on assumptions, though I find it pretty self explaing that, if I have a moving sensor inside my EF mount camera, I get a problem with the circle of reproduction of the lens, when using a FF sensor.
I find most of my assumptions pretty logical, ofc thats because I assume thinks are that way.
I am open to other ppls suggestions and assumptions (or knowledge) if they take the time to discuss them here.
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Raimund Rau
Ofc MY opinion is based on assumptions, though I find it pretty self explaing that, if I have a moving sensor inside my EF mount camera, I get a problem with the circle of reproduction of the lens, when using a FF sensor.
I find most of my assumptions pretty logical, ofc thats because I assume thinks are that way.
I am open to other ppls suggestions and assumptions (or knowledge) if they take the time to discuss them here.
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Raimund Rau
H
Henry Richardson
Guest
The Sigma 80-400mm OS is not in Minolta mount so this is not even an issue.
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Henry Richardson
http://www.richardson.photoshare.co.nz/
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BenY-972
Member
But IS lenses are using more elements/groups and that reduces sharpness somewhat,at this point of sensor evolution it may not make much difference but in the future when sensor size and pixel counts gets much higher it will be noticeble, Therefore the need for camera body IS .
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