cba_melbourne
Veteran Member
Interesting. It is possible that they have an approximate range information. I simply do not know.M4/3 lenses has the range information. Not exact by centimeters but enough.It would require that focus motors have an absolute position encoder (or at least an index for two calibrated positions). Ordinary fly by wire focus lenses simply do not have that. Professional broadcast cameras do.Yes. If I'm in Av mode, I'd like to be able to push a button and have it set. It should be possible but the last time I asked if it was an available feature I was told no.Or would you like to enter a depth of focus range, and have the camera set the aperture and focus point to achieve this for you?I'm still shocked there's no automatic hyperfocal program implemented. Is it that hard?Kinda the same for me, for "street camera" it lacks (imho) a few things:I always saw the digital Pen-F as an overdesigned, misconcepted camera.
1- Tilting screen
2. Weather sealing
3. Better manual AF helpers (they can learn from Fuji to implement digital DOF / distance scale and putting separate AF/MF lever on camera).
And not must for a street camera, but for all-rounder - PDAF and good C-AF.
If it only had first 3 points, even without PDAF - I would definately grab it as a travel / street camera (99% of my shots) because of the small form factor, unique JPEG engine / profiles. E-M1.2 is alittle bit too bulky to be "every time with me" camera, but Pen-F could be.
It's one thing on a manual lens with markings where you can guess at it but on a focus by wire lens with no markings this should be a feature.
What I have observed, is that when I mount a lens and turn on the camera, the lens focus is at the position, where the lens was left when used last time. It does not first go to infinity to find an index mark.
If after mounting it did first go to infinity, it could from there on count the number of steps to know its focus position. Provided the focus drive motor is either a stepper motor, or its drive mechanism is fitted with at least an incremental focus encoder. That would of course only work until power is turned off, then the process would have to start afresh.
Do you know if there is any form of focus position or distance information hidden in the exif data? If so, then that would support your claim.
If no such information exists in exif data, that does not automatically invalidate your claim. The information may till exist, but so far not be used or only used internally.
The lenses needs to know what is its focus range, and they know each step/rotation they have and where they are. They know where to park focus, where it was left and when they are reaching the end of their range and they know how much to move for reaching given focus distance.
It is all there.
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