Dpreview does away with formal resolution tests in their reviews

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

--
"I was gratified to be able to answer promptly, and I did.
I said I didn't know."
-Samuel Clemens.

On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Regards,

Eric Stevens

On 2012-04-30 19:55:16 -0700, Eric Stevens said:

On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Regards,

Eric Stevens

What if you swing it around your head by the strap, in a figure of
eight pattern?

--
Regards,

Savageduck

On Mon, 30 Apr 2012 20:29:35 -0700, Savageduck
wrote:

On 2012-04-30 19:55:16 -0700, Eric Stevens said:

On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Regards,

Eric Stevens

What if you swing it around your head by the strap, in a figure of
eight pattern?

Then its unlikely that any of them matter.

Regards,

Eric Stevens

On 2012-04-30 22:55 , Eric Stevens wrote:
On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Translation (y,z) are a lot of it (same as the Sony system).

The weakness of that is pitch and roll is also present. Yaw is a lesser
concern. When you depress the shutter you can easily roll the camera a
little. Along the lens axis, if not well balanced, is the other concern
(pitch).


--
"I was gratified to be able to answer promptly, and I did.
I said I didn't know."
-Samuel Clemens.

On 2012-05-01 16:41 , John A. wrote:
On Tue, 01 May 2012 15:51:17 -0400, Alan Browne
wrote:

On 2012-04-30 22:55 , Eric Stevens wrote:
On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Translation (y,z) are a lot of it (same as the Sony system).

The weakness of that is pitch and roll is also present. Yaw is a lesser
concern. When you depress the shutter you can easily roll the camera a
little. Along the lens axis, if not well balanced, is the other concern
(pitch).

A less ambiguous way to describe pitch would be to say it is rotation
about the axis running horizontally across the sensor. Or, more
simply, tilting up and down.

As you like.


--
"I was gratified to be able to answer promptly, and I did.
I said I didn't know."
-Samuel Clemens.

On 2012-05-01 17:10 , John A. wrote:
On Tue, 01 May 2012 16:49:21 -0400, Alan Browne
wrote:

On 2012-05-01 16:41 , John A. wrote:
On Tue, 01 May 2012 15:51:17 -0400, Alan Browne
wrote:

On 2012-04-30 22:55 , Eric Stevens wrote:
On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Translation (y,z) are a lot of it (same as the Sony system).

The weakness of that is pitch and roll is also present. Yaw is a lesser
concern. When you depress the shutter you can easily roll the camera a
little. Along the lens axis, if not well balanced, is the other concern
(pitch).

A less ambiguous way to describe pitch would be to say it is rotation
about the axis running horizontally across the sensor. Or, more
simply, tilting up and down.

As you like.

Point being if "along the lens axis" describes pitch, it also
describes yaw (swinging side to side). Or rotation about any arbitrary
axis running parallel to the sensor plane and intersecting the lens
axis, for that matter.

Pitch, roll and yaw are clear. For those unfamiliar with any of the
terms there's wikipedia.


--
"I was gratified to be able to answer promptly, and I did.
I said I didn't know."
-Samuel Clemens.

On 2012-05-01 17:10 , John A. wrote:
On Tue, 01 May 2012 16:49:21 -0400, Alan Browne
wrote:

On 2012-05-01 16:41 , John A. wrote:
On Tue, 01 May 2012 15:51:17 -0400, Alan Browne
wrote:

On 2012-04-30 22:55 , Eric Stevens wrote:
On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Translation (y,z) are a lot of it (same as the Sony system).

The weakness of that is pitch and roll is also present. Yaw is a lesser
concern. When you depress the shutter you can easily roll the camera a
little. Along the lens axis, if not well balanced, is the other concern
(pitch).

A less ambiguous way to describe pitch would be to say it is rotation
about the axis running horizontally across the sensor. Or, more
simply, tilting up and down.

As you like.

Point being if "along the lens axis" describes pitch, it also
describes yaw (swinging side to side). Or rotation about any arbitrary
axis running parallel to the sensor plane and intersecting the lens
axis, for that matter.

I forgot to add:

"Which is why I added the word "pitch" to my sentence." Pitch is not
ambiguous unless you don't know what it means. Then there's wikipedia.


--
"I was gratified to be able to answer promptly, and I did.
I said I didn't know."
-Samuel Clemens.

On Tue, 01 May 2012 15:51:17 -0400, Alan Browne
wrote:

On 2012-04-30 22:55 , Eric Stevens wrote:
On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Translation (y,z) are a lot of it (same as the Sony system).

The weakness of that is pitch and roll is also present. Yaw is a lesser
concern. When you depress the shutter you can easily roll the camera a
little. Along the lens axis, if not well balanced, is the other concern
(pitch).

Pitch movement of the lens axis is the same as roll around the X axis.

My point is that roll only matters if it deflects (as distinct from
rotates) the lens axis. The lever effect of a long lens axis (to the
subject) makes such movements critical.

Regards,

Eric Stevens

On Wed, 02 May 2012 01:02:35 -0400, John A.
wrote:

On Wed, 02 May 2012 13:29:03 +1200, Eric Stevens
wrote:

On Tue, 01 May 2012 15:51:17 -0400, Alan Browne
wrote:

On 2012-04-30 22:55 , Eric Stevens wrote:
On Mon, 30 Apr 2012 19:13:56 -0400, Alan Browne
wrote:

On 2012-04-30 11:58 , RichA wrote:
http://www.dpreview.com/reviews/olympusem5/

Very nice stabilization system (pitch, roll, yaw, y, z).

I suspect only the X and Y rotational axiis matter much.

Translation (y,z) are a lot of it (same as the Sony system).

The weakness of that is pitch and roll is also present. Yaw is a lesser
concern. When you depress the shutter you can easily roll the camera a
little. Along the lens axis, if not well balanced, is the other concern
(pitch).

Pitch movement of the lens axis is the same as roll around the X axis.

My point is that roll only matters if it deflects (as distinct from
rotates) the lens axis. The lever effect of a long lens axis (to the
subject) makes such movements critical.

So if the camera is spinning about the lens axis so as to turn, say,
ten degrees during the exposure, that will make no difference to the
shot so long as said axis itself doesn't move?

I was considering only the movements likely to be encountered in
normal use. I'm not quite sure how you could obtain 10 degrees
rotation during any exposure sufficiently short for any stabilisation
system to have any effect. In fact, I don't think any stabilisation
system could cope with 10 degrees of rotation.

Regards,

Eric Stevens