On 2025-07-28 09:51, John Francis wrote:
On Sun, Jul 27, 2025 at 06:25:56PM -0400, Sandy Harris wrote:
Is the text on teleconverters here reasonable? Or, for that matter,
the rest of the article?
https://en.wikivoyage.org/wiki/Travel_photography/Full_systems#Telephoto_lenses
Most of the article is reasonable (although there's nothing really
said there that any experienced photographer wouldn't already know).
It pretty much matches my experience.
But there is one 'suggestion' there that I find totally ridiculous;
that
one way to get a narrower field of view is to purchase a small-sensor
body (with the same lens mount) to use alongside your full-frame body.
Almost all the small-sensor bodies I know have no more pixels in total
than the same area of the larger sensors in the full-frame body, so all
you get by adding a different body is more weight to carry around;
simply cropping the full-frame image to the area of interest will yield
an image at least as good as the one you would get from a smaller
sensor.
The per pixel resolution of the K-3 is a little higher than the K-1, but
not
dramatically so. I.e. the K-3 III will have more pixels than the K-1 in
crop
mode.
Here are my thoughts:
Note what the diffraction limit is on different sensors. TL;DR for the
most part it seems that most modern sensors are pretty close to
out-resolving
most lenses. This is the reason that anti-aliasing filters are going
away.
At one end of the spectrum, you have people doing things like
astrophotography,
where the absolute resolution of the final image is critical. If they
are already
using a high resolution sensor (as opposed to Tri-X film), and
processing the
raw files using a teleconverter doesn't seem to improve final image
quality,
and could degrade it.
On the other hand, if someone is just taking the jpegs out of their
camera,
and not doing any post processing, or they are using film, or a low
resolution
sensor, then a teleconverter could help.
A lot of image quality does come down to how many photons hit the image
area
of the sensor, or the pixel. Adding a TC can't put any photons there
that weren't
there with the base lens.
--
Larry Colen [email protected] http://red4est.com/lrc
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