But if that were the case it wouldn't be possible to use a tilt lens on
a digital camera. Such is not the case as Dr. Mike proves every time he
uses his custom tilt adapter... which has tilt about 500 times greater
than a ten micron machining error on an adapter.
Chuck Norcutt
On 10/21/2013 11:12 AM, Ken Norton wrote:
> Maybe he is referring to the microlenses over each sensel, because
> that would most certainly be true. Some cameras are designed with this
> in mind, so the microlenses are offset more and more the farther away
> from the center of the sensor they are. The manufacturer determines
> what the typical position of the exit optic is and positions the
> microlenses accordingly.
>
> This may finally start to be becoming a lesser issue as "backlit"
> sensors come more and more into play and also sensors where the
> individual sensels are tuned to a wavelength rather than use filters.
> As sensors become more "flat", they start to mimick the
> characteristics of film even more.
>
> The next frontier in sensor development will be the multi-color
> sensors. Instead of using an RGB detection matrix, they will start to
> use the extreme pixel count to advantage by implementing an RGBCYMK
> matrix. As it is right now, the gammut is limited in the derived
> colors.
>
> AG
>
> On Mon, Oct 21, 2013 at 8:38 AM, Chuck Norcutt
> <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>
>>
>> On 10/20/2013 10:20 PM, usher99@xxxxxxx wrote:
>>> Hmmm, the optical engineering/tester types consistently report that
>>> the short registration distance cams
>>> are much more subject to errors in the adapters.
>>
>> I can't argue with that but I don't know why.
>>>
>>> The angular displacement will result in lens elements being more
>>> displaced off axis in a longer adapter but that was my conjecture for
>>> the reason the short registrations cams being more sensitive to
>> > adapter perturbations.
>>
>> But I will argue with that. The lens (as a whole) is off-axis but the
>> lens *elements* are not off-axis relative to each other. The lens is
>> still capable of forming as good an image as ever except the image is
>> tilted *very slightly* to the image plane of the sensor. I contend
>> that, as long as it's well within the depth of focus, there is no
>> visible problem. But if might be visible if pixel peeping at 100% vs.
>> studying a real photo of a 3D target. And, as I said before, the error
>> at the sensor plane is an angular error and independent of the length of
>> the adapter.
>>
>> Come to think of it, you're the guy who is much into tilting lenses
>> *way* off-axis using your custom adapters. Your tilted lenses to not
>> create distorted images but they do focus parts of the image at
>> different distances.
>>
>> Chuck Norcutt
>> --
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>
>
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