<no chipped adapters for mirrorless cameras.>
There are a few very smart adapters for FE mount though:
Sony themselves makes a very smart adapter for the original A mount ( Minolta
AF mount lenses, and later Sony/minolta fully electronic elaboration). This
includes the older mechanical diaphragm stop down mechanism and the auto focus
mechanical screw drive of the original early A mount, as well as all electronic
newer versions.
This unit incorporates a partial silvered mirror with phase detector (losing
1/3 stop of light) but this allows the same fast focus speed with the old
lenses, of a modern camera and allows focusing even while videoing or during
shutter release blackout. This is probably very good for Sony's high resolution
video camera that uses EF mount lenses.
For many of the old lenses, this device includes Exif info and other
features,depending on lens vintage.
There are actually two current Sony smart adapters with less and more backward
compatibility. The most full featured one is pricey ~$350, the other one does
not include phase detect focus but also does not lose 1/3stop.
Metabones makes a somewhat similar Canon EF to Sony FE mount adapter, for using
Canon AF lenses on these bodies, although auto focus speed is not as fast.
That also includes full diaphragm automation and exif data. Cost is ~ similar
or a little more.
There is at least one other vendor making a Canon adapter similar to metabones,
but seems of lessor quality/ cheaper. But likely will improve over time.
So an A7 can be used with most Minolta/Sony (alpha mount) A mount lenses going
back to 1985. Third party lenses in those mounts have worse compatibility and
may not all work. In addition most electronic Canon EF lenses (late 80's to
today) will work with AF, diaphragm control,program mode etc. at a cost.
The Minolta Maxxum lenses from the mid 80's to early 2000's included a few very
good lenses and prices are often very reasonable used,unlike new Sony and Sony
Zeiss lenses which tend to be expensive.
There are a few compact Aps C Sony lenses in E mount, like the 16-50mm pancake
zoom,with anti-shake, which turns a full frame A7 into a pretty compact travel
camera, when you want to leave your larger lenses at the hotel. The body can
autodetect APS format lenses and crop accordingly, if you choose that setting.
So that lens is 24mm-75mm equivalent and produces 12M pixel pictures, a nice
bonus option for walkabout.
The focus aid magnification in an A7 ,can help make the fact that no simple
chipped adapters are available, a bit less important.
Tim Hughes
________________________________
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, September 17, 2014 9:27 AM
Subject: Re: [OM] Best OM to A7 adapter?
AFAIK, there are no chipped adapters for mirrorless cameras.
Chuck Norcutt
On 9/17/2014 11:41 AM, Ken Norton wrote:
> Another factor, is having to turn the camera off when changing lenses.
> If you use just the one adaptor, you can swap lenses without the
> camera needing to be turned off. This, however, is worthless if you
> use chipped adaptors that identify the focal length used.
>
> So, whatever...
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