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Micro Four Thirds Discuss the newly announced Micro Four Thirds addition to the Four Thirds system family here.

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Old 12th August 2011
Ross the fiddler's Avatar
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Adapter with a difference.

Why hasn't Olympus done this for their 4/3's lenses, especially SWD lenses etc.?
http://photorumors.com/2011/08/11/so...-mount-lenses/

Well, it was an idea anyhow.
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Old 12th August 2011
Ulfric M Douglas Ulfric M Douglas is offline
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Re: Adapter with a difference.

The thing has certainly been mentioned before, when it's more than a rumour then it'll be worth looking at again.
I was hoping the e-P3 would ship with such a module, but reality was far from it!
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Old 12th August 2011
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Re: Adapter with a difference.

Quote:
Originally Posted by Ross the fiddler View Post
Why hasn't Olympus done this for their 4/3's lenses, especially SWD lenses etc.?
http://photorumors.com/2011/08/11/so...-mount-lenses/

Well, it was an idea anyhow.
But Olympus has already released AF adapters to mount 4/3 lenses to m4/3 bodies.

http://www.olympus.co.uk/consumer/21...mf-1_21781.htm

http://www.olympus.co.uk/consumer/21693_23455.htm

Or do you mean and adapter with a mirror?

Besides, what it the point of a mirror? It makes the adapter heavier and more unreliable (more mechanical parts).

Also, NEX bodies are so small that an A-mount lens will look ridiculus on it. Even its native lens look funny on it (except the pancake).
With that bulk, why not by an A-mount DSLR camera in the first place?
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Old 12th August 2011
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Re: Adapter with a difference.

Quote:
Originally Posted by zuiko-holic View Post
But Olympus has already released AF adapters to mount 4/3 lenses to m4/3 bodies.

http://www.olympus.co.uk/consumer/21...mf-1_21781.htm

http://www.olympus.co.uk/consumer/21693_23455.htm

Or do you mean and adapter with a mirror?

Besides, what it the point of a mirror? It makes the adapter heavier and more unreliable (more mechanical parts).

Also, NEX bodies are so small that an A-mount lens will look ridiculus on it. Even its native lens look funny on it (except the pancake).
With that bulk, why not by an A-mount DSLR camera in the first place?
Well the Pellicle mirror is fixed - so there are no moving parts, at the cost of slightly reduced light transmission to the sensor. However there must be risks to the unit due to repeated removal, not to mention bouncing around in the camera bag.

The advantage is that phase detection AF drives conventional lenses better than contrast detection. Contrast detection moves the lens assembly backwards/forwards in decreasing amounts till it gets the greatest contrast, as a result the moving parts of the element assembly are made as light as possible and are optimised for rapid repeated movement. Conventional lenses are designed for optical quality and tend to be heavier, this matters less for phase detection as it can 'see' how much the lens has to move to get focus, and moves the lens by that amount.

(Basically phase detection actually focusses a lens, contrast detection just finds the most contrast by repeated comparison and then hopes that means the camera is in focus on what the user wants).

It would be great if Olympus could offer this - but I wonder if the distance between the mount and the back of a 4/3'rds lens is great enough. It's worth hoping though.

Nick
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