[LRflex] Re: Digital APO correction in our futures?
- From: William Abbott <wbabbott3@xxxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Fri, 29 Sep 2006 12:20:54 -0700
Bob, Andrew-
Thank you both for your kind replies to my remarks about the
Hasselblad Digital APO Correction (DAC) .
As Andrew pointed out, I am indeed behind the times in this area, and
need to do some digging, on which I will gladly embark. I always seem
to have a lot to learn; it is a fact of my life.
I tend to divide photography into what happens before the shutter
clicks and what happens afterwards, and those now come in two
flavors, analog and digital.
What intrigues me is the progression of digital technology from post-
click, off-camera processing (digital manipulation of raw files,
Photoshop, etc.) upstream into the camera itself, to account for lens
vignetting, for example, and now lens CA, in real time, as the data
stream moves from the sensor to the digital file.
The ability to alter, in that moment, what has heretofore been
unalterable, seems to me to be a technological marvel of great
promise, especially if it can become adaptive, i.e., the specific
alteration is dependent on the environment in which the image is
being recorded, becoming similar to adaptive aircraft flight
controls, which alter their behavior according to the flight regime
in which the aircraft is operating.
So thank you both very much for helping me understand this subject
more clearly. Bob, I'm not familiar with "DX/O" and will appreciate a
lead to where I can learn more.
With all best wishes,
Bill
On Sep 28, 2006, at 9:08 AM, bob palmieri wrote:
> Bill -
>
> I'm currently trying out the DX/O version of this sort of thing.
> They have profiles for a number of lenses; in the case of lateral
> chromatic aberration I think they just re-map the pixels to change
> the apparent magnification of individual channels.
>
> Bob Palmieri
>
>
>
>
> On Sep 27, 2006, at 3:41 PM, William Abbott wrote:
>
>> Hi all,
>>
>> Here is something that caught my eye.
>>
>> Digital correction in software of optical design problems seems to be
>> coming to the market place, something new to me, though it has been
>> theoretically possible for some time.
>>
>> Here is an exerpt from a short article in Digit, which says about
>> itself, "Digit is the UK's leading resource for creative
>> professionals, both in print and online." The article is entitled:
>> Leica, Hasselblad Show New Digital Cameras, Wednesday 27 Sep 2006 -
>> 09:20, and can be read at:
>>
>> http://www.digitmag.co.uk/news/index.cfm?NewsID=6201
>> After discussing the new Leica cameras, the article goes on to say,
>> "Hasselblad launched what the company claims to be the world's first
>> 48 millimetre full-frame DSLR camera." Here is the later paragraph of
>> interest:
>>
>> "The camera is built around a new digital camera engine. Information
>> about lens and exact capture conditions are fed into the engine for
>> ultra fine tuning of the auto-focus mechanism, taking into account
>> the design of the lens and optical specification of the sensor.
>> Another feature is Digital APO Correction (DAC)."
>>
>> What this "feature" means for new and old lenses is left unclear.
>>
>> Can new lenses now be constructed more simply by using this mode of
>> optical "correction"?
>>
>> Can older lenses have their performance "improved" by a one-shot
>> measurement of their inadequacies and the prescription of a digital
>> correction?
>>
>> As ever,
>>
>> Bill
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