Sorry, I do not want to spend $ 2800 US Dollars for this new Great/ Super Sharp , Canon EF 11-24 L 2.8, Because I already have Good Rokinon 12 MM F/ 2.0, <snip>
1. We're not offended by your choice of lenses, you don't need to apologize.
2. It seems you have a crop camera, so it's expected you would be uninterested in an expensive FF UWA zoom.
Thanks, Dear Friend Mr. Antono Refa.
You're welcome, dear buddy.
Well, I have Both FF and Crop Frame Canon Cameras
Then, as you probably know, there are hardly any rectilinear lenses wider than 16mm. If you're not willing to spend $2,800 on one of those few, that's your choice, no need to say you're sorry.
[I wouldn't spend $2,800 on this lens, if released, but I will wait patiently for a price drop.]
THANKSSS, Dear friend Mr.
I am lower level in Technical Know How of Photography , The Stupid question is " there are hardly any rectilinear lenses wider than 16mm. "= What is rectilinear Lens ? = The Distortion at the edges of the photos ?
I am fast learner, and Want to learn the new thing in every days.
Have a great Sunday, Sir.
Rectilinear = a wide angle lens which is not a fish eye. They aim to render straight lines perfectly straight, even at the edge of the frame. If you were to fill the frame with a flat subject (eg a test chart) it would be capable of taking a distortion free image of it if lined up perfectly.
Rectilinear lenses do suffer from other forms of distortion which fisheyes (especially stereographic fisheyes) are less susceptible to - any subject which is three dimensional really. Take a group photo for example - people near the edges of the frame are stretched. Anything in the corners looks even more extreme. Even photos of innocent stuff like grass filing the bottom half of the frame and sky in the top - the details in the grass blades will take on the characteristic stretch into the corners, as will any clouds.
The wider the rectilinear lens, the more pronounced this effect will be. In certain scenarios it can be something to be embraced (although not group shots!)
Yes you are correct, a fully rectilinear corrected lens is one where straight lines stay straight in the frame. Two good examples of this are the 14L and Sigma 12-24 HSM (mkI). Circles become more egg shaped as the approach the corners of the frame. All wide lenses show distortion somewhere, either lines or circles.
Most rectilinear wide lenses are corrected to some degree but not fully. This is to allow a compromise and versatility. A fully corrected lens distorts circles (faces) so a design compromises is employed to keep straight lines fairly straight (a slight curve is usually not too noticeable and quite acceptable) but keeps the circles fairly circular (unless you shoot up close). The 16-35IIL is a great example of this. Most lens designers assume the user will correct in Lightroom / Photoshop if they need a more extreme correction. I find the look I get out of the 16-35IIL looks quite natural and is kind on the eye. A 14L, TS-e 17L or Siggi 12-24 tend to look very angular and isn't how the human eye sees the scene.
Where as fish-eye lenses are the complete opposite. Circles stay circular but straight lines curve as they approach the edges of the frame.
This is why I have more than one wide lens in my collection and why I am REALLY looking forwards to this new lens from Canon. It could be a game changer.