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Someone on 43rumors solved 4/3 lens CDAF

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Jeff said:
Hate to be a skeptic, but I wonder if they meant '5 stop' rather than '5 axis' stabilization. The 5 axis thing would be a huge technical innovation, and can't imagine that it could be crammed into a
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no need to wait,
on looking for it I find that 5 axis stabilisation is already here

http://www.visual-air.co.za/news/worlds-first-5-axis-gyro-pod/
Jeff said:
--
Jeff

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Riley

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Rriley said:
Jeff said:
Hate to be a skeptic, but I wonder if they meant '5 stop' rather than '5 axis' stabilization. The 5 axis thing would be a huge technical innovation, and can't imagine that it could be crammed into a
Click to expand...
no need to wait,
on looking for it I find that 5 axis stabilisation is already here

http://www.visual-air.co.za/news/worlds-first-5-axis-gyro-pod/
Click to expand...
Panasonic also have a 5 axis OIS in some video cams

http://panasonic.net/avc/camcorder/hd/v700/feature2.html
 
well now they are saying
'Olympus OM-D has the fastest AF of all mirrorless cameras'

I guess Im too lazy to start yet another thread .. ;)

I just get the feeling that if they squeeze any more into this thing its going to take off like a moon rocket

--
Riley

any similarity to persons living or dead is coincidental and unintended
support 1022 Sunday Scapes'
 
jim stirling said:
Rriley said:
Jeff said:
Hate to be a skeptic, but I wonder if they meant '5 stop' rather than '5 axis' stabilization. The 5 axis thing would be a huge technical innovation, and can't imagine that it could be crammed into a
Click to expand...
no need to wait,
on looking for it I find that 5 axis stabilisation is already here

http://www.visual-air.co.za/news/worlds-first-5-axis-gyro-pod/
Click to expand...
Panasonic also have a 5 axis OIS in some video cams

http://panasonic.net/avc/camcorder/hd/v700/feature2.html
Click to expand...
That's panasonic camcorder looks amazing. Who knows, maybe the rumor of 5 axis stabilization is correct. If so it would be an impressive technical innovation, opening the doors to interesting uses. Fast AF would be very cool.

--
Jeff

http://www.flickr.com/photos/jck_photos/sets/
 
"Fastest AF of all mirrorless cameras" means that Olympus has made incremental improvements in their CDAF system over the E-P3 generation of cameras. This is good news for everyone except the 10 people on this forum who have some crazy idea that the OM-D will support old and obsolete 4/3 DSLR lenses.
 
sigala1 said:
"Fastest AF of all mirrorless cameras" means that Olympus has made incremental improvements in their CDAF system over the E-P3 generation of cameras. This is good news for everyone except the 10 people on this forum who have some crazy idea that the OM-D will support old and obsolete 4/3 DSLR lenses.
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this remark can only come from someone who has not used the E-system FT SLR lenses, so I am not even going to bother trying to explain how they are not old or obsolete (or even IF they are a few years old, they are not obsolete by any stretch of the imagination)

--
Roel Hendrickx

lots of images : http://www.roelh.zenfolio.com

my E-3 user field report from Tunisian Sahara: http://www.biofos.com/ukpsg/roel.html
 
sigala1 said:
"Fastest AF of all mirrorless cameras" means that Olympus has made incremental improvements in their CDAF system over the E-P3 generation of cameras. This is good news for everyone except the 10 people on this forum who have some crazy idea that the OM-D will support old and obsolete 4/3 DSLR lenses.
Click to expand...
Nothing like establishing your credibility with a few well chosen postings like this.

--
Jeff

http://www.flickr.com/photos/jck_photos/sets/
 
Entropius said:
But wait! What if we had another way to change the focus of the lens other than the lens AF motor, a way that could make very rapid changes? Then we could use that for the rapid jiggling that causes problems for lens AF motors, figure out which way to go, and then engage the lens AF.
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Yeah, then when the glass has got 'almost' focus, move the sensor again.
Entropius said:
As a plus, this trick could be used for focus finetune on manual lenses, too! You'll have to manually get it close, but then the shifting sensor can be used to finetune the AF.
Click to expand...
Ack, it just seems too much to hope that camera engineers actually do this ... way too sensible.

A bit like expecting the firmware engineers to give every decent camera more than +-3 EV & 7-steps in their bracketing. Obvious stuff but deliberately not implemented.

Dang, you guys are going to have to quote sigala from now on 'cos he's earned a tick in my ignore box for that last spout of claptrap.
 
I asked for this in a very old thread of mine called "What I need, what I want and what I would pay for it", or something similar.

The idea has been out for a while. I wonder if whoever owns the Contax name still owns the patents for it.
 
The Contax name is owned by Zeiss. I presume Kyocera holds the Contax camera system patents (and plans on some dusty shelf for a digital Contax G).

Cheers,

Rick
goblin said:
The idea has been out for a while. I wonder if whoever owns the Contax name still owns the patents for it.
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if we have sensor movement focus, then we dont need lens motors anymore.

why does no Leica camera and also not the Ricoh gxr leca module do focussing by sensor z axis movement ?

it was a rumor that leica would do this1-2 year agom, but they didnt.

it seems that focussing by sensor movement is not so easy.
--
cheers

Mr.NoFlash
 
Mr.NoFlash said:
if we have sensor movement focus, then we dont need lens motors anymore.
Click to expand...
You still need them, as sensor movement is typically not enough.

The positive side is that all your lenses can become macro this way.

I personally see the thing as a combination of the existing lens motor movement (but with much less movement required) and the sensor moving hyper fast for the last few micro adjustments.

But that would require tons of computing power to synchronise. And no one said it would be easy.

Then again, we don't know yet if the patents of the thing have expired. Contax patented focusing by moving the focal plane. That does not specify film or sensor. So it might be still valid as a patent, and that would prevent others from using it, provided they want to use it. Which is not certain.
 
Mr.NoFlash said:
if we have sensor movement focus, then we dont need lens motors anymore.
Click to expand...
this isnt true

if you were to look at a ray trace for a lens used in such a way you would find that it would become far from optimum
Mr.NoFlash said:
why does no Leica camera and also not the Ricoh gxr leca module do focussing by sensor z axis movement ?

it was a rumor that leica would do this1-2 year agom, but they didnt.

it seems that focussing by sensor movement is not so easy.
Click to expand...
Even if you could keep a sensor perfectly parallel, Im sure there would be a lot of optical problems with this if used as a focus system. For gathering focussing system data however, thats another matter
Mr.NoFlash said:
--
cheers

Mr.NoFlash
Click to expand...
--
Riley

any similarity to persons living or dead is coincidental and unintended
support 1022 Sunday Scapes'
 
...
Rriley said:
Even if you could keep a sensor perfectly parallel, Im sure there would be a lot of optical problems with this if used as a focus system.
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I don't see how a sensor moving back and forth in one plane would cause more problems than a sensor moving in all directions way, way faster, which is what IBIS does, and which has been out for ages.

The Contax system worked with film, which was a combo way, way heavier to move, and it worked fine, albeit a bit slow.

Now combining IBIS and focusing via sensor movement might be a tough call. Maybe only one at the time will be usable.

But other than that, achieving focusing via sensor movement should be no rocket science, at least mechanically.
 
goblin said:
...
goblin said:
Even if you could keep a sensor perfectly parallel, Im sure there would be a lot of optical problems with this if used as a focus system.
Click to expand...
I don't see how a sensor moving back and forth in one plane would cause more problems than a sensor moving in all directions way, way faster, which is what IBIS does, and which has been out for ages.
Click to expand...
well ok, you dont see it. but effectively with the complications of IS and SSWF you have a sensor suspended in air that has to be in exactly the right place, I do not think that is reliable.
goblin said:
The Contax system worked with film, which was a combo way, way heavier to move, and it worked fine, albeit a bit slow.
Click to expand...
I recall with the Contax you had to set the lens at infinity first, later of course they went to AF much like Canons in the Contax N. Indeed their very excellent lenses can be converted to Canon EOS mount with AF
goblin said:
Now combining IBIS and focusing via sensor movement might be a tough call. Maybe only one at the time will be usable.
Click to expand...
well thats the thing, and what is it good for, essentially MF lenses which they dont make anymore. Why would they do this
goblin said:
But other than that, achieving focusing via sensor movement should be no rocket science, at least mechanically.
Click to expand...
--
Riley

any similarity to persons living or dead is coincidental and unintended
support 1022 Sunday Scapes'
 
Depending on the lens and the amount of focus change required, the sensor might have to move several inches to achieve focus. In extreme situations, it could be up to over a foot.

How's that plan sound now?
--
Lee Jay
(see profile for equipment)
 
ok, on maco lenses the travel is more [nt] macros would have to keep the motor
 
goblin said:
Then again, we don't know yet if the patents of the thing have expired. Contax patented focusing by moving the focal plane. That does not specify film or sensor. So it might be still valid as a patent, and that would prevent others from using it, provided they want to use it. Which is not certain.
Click to expand...
patents live 20 years. when was the contax camera developed ?
 
Yep, old technology, maybe this way (with a few upgrades):
No moving mirror.



 
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