PanasonicRaw CameraIFD 0x1101

[Klaus_Homeister]

Hi Phil,

I checked this Tag for a little more information.
For testing I have a GX-8 with 12-60mm Lens.

The value of this Tag is a _signed_ short.

When you setup the cam to manual focus, you get an white bar at the bottom of the touchscreen with an red part at the end.
Where the color of the bar changes from white to red, the values change from large positive integers to large negative integers.
You get always a -1 on focus to infinity.

The unit can not be meters/cm/mm ... looks more like steps of the focusing-motor.

In other peoples RW2-Files taken with other cams and lenses the value can go down to zero at closest focal distance.
On my GX8 with 12-60mm you can't get closer than 31.

That's the same value as shown in Tag 0x1100.
Only shooting _without_lens_ there is a 30 in 0x1100.

So I expect Tag 0x1100 as the 'closest focal distance' in steps.   
and Tag 0x1101 as 'current focal distance' in steps - divided in two ranges 'close to medium'(positive) and 'far to infinity'(negative).

Greetings from Germany
Klaus

[Phil Harvey]

Hi Klaus,

ExifTool is already decoding 0x1101 as FocusDistance in metres by dividing the value by 200.  Does that sound right to you?

- Phil

[Klaus_Homeister]

Hi Klaus,

ExifTool is already decoding 0x1101 as FocusDistance in metres by dividing the value by 200.  Does that sound right to you?

- Phil

NO never!

1st no lens can focus physically to '0' like other cams and lenses can set values here.
2nd the physical closest focal distance of my 12-60mm is 20cm on Tele and 25cm on wide angle. But both have 31 as value here!
3rd when you interpret as unsigned integer there would be a large gap in 'meters' at the point where focusing seamlessly leaves the white part of the bar into the red part. It's definitive a signed value and then a simple 'divide by' can not be correct.

-Klaus

[Phil Harvey]

Hi Klaus,

OK, thanks.

- Phil