--- "J. C. O'Connell" <[EMAIL PROTECTED]> wrote:
> well of course a FF sensor is going to be more sesitive
> to lens designs, you are using the whole lens image instead
> of less than half of it with APS,
That's not really the issue at all. With a FF sensor in an
existing lens mount, the corners and edges are farther from the
optical axis of the lens which can cause more aberrations, both
from CA in the len itself and from the effects of diffraction
around the pixel well lens' edges. The telltale signs of this
are mosaicing and greatly reduced resolution at corners and
edges, along with higher levels of CA and greater than normal
corner-edge light falloff.
> ... BUT with FF there is more
> than twice the detail in the image with the same uniform lens
That all depends on the density of pixels on the chip, and has
nothing to do with the size of the format.
> vs APS and wides on FF are something APS cant even do!
For a larger format chip, of course the same focal length has a
larger field of view. This is nothing new to hear.
If a larger format sensor has the same pixel density as the
current 16x24mm sensor, it will provide the same detailing on a
wider field of view with the same focal length lens, with more
pixels due to its larger size, PRESUMING that the quality of the
lens-sensor optical system is such that corner/edge resolution
doesn't fall apart.
> ... APS exists because of much lower
> costs than FF, not because its technically better.
16x24mm format chips exist because of a practical tradeoff: a
combination of being able to get the best results from an
existing set of lenses with existing lens mounts and camera
chassis as well as the much lower cost of manufacture of the
smaller chips.
A larger sensor format *should* have a larger lens mount *and*
recomputed optical designs to maximize telecenticity to the
edges and corners of the chip in order to obtain maximum
quality. (This fact, BTW, is why the FourThirds cameras from Oly
are not that much smaller then the 16x24mm cameras from everyone
else even though the format and mount are new.) All the camera
manufacturers know this, but they're burdened, as the users are,
with a lot of existing lenses in their existing mounts. The cost
of the proper redesign of lens mount, bodies and lens lines is
astronomical, even in comparison to the cost of the current,
somewhat compromised 24x36mm sensor bodies.
Godfrey
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