21mm Color-Skopar Architecture

[dazedgonebye]

Just one shot. A Frank Lloyd Wright designed spire, built just a couple of years ago in Scottsdale, Arizona.
I made no corrections for distortion. Run a line up that spire and it's rendered pretty much straight as far as I can tell.

 

[amateriat]

Staggeringly good, Steve.


- Barrett

 

[Dougg]

Those jaggies make for frazzled eyeballs, Steve! Nice calm colors though..

 

[dazedgonebye]

Those jaggies make for frazzled eyeballs, Steve! Nice calm colors though..

Well, we'll have to credit/blame the design on Wright...I just took the picture.

 

[thafred]

HI Steve,
Great shot with the 21! interesting Subject too
I think that distortion is close to zero with this lens (except wa-distortion of round objects..but thats an optical and not engeneering problem)

The only time I saw distortion was with a picture I made in zürich/swizerland were a handrail was running parallel to the lower edge of the frame and I could see that the rail was somewhat slightly farther away of the corners than the center...never saw this again thou.

great lens...have Fun with yours!

Edit: I´ve found the photo on my companys pc hdd! (don´t tell anybody ) so here´s the worst case of distortion that I ever encountered

 

[Dougg]

Interesting, Thafred! Your shot does show the tiniest bit of barrel distortion, not at all an uncommon effect for wide lenses, but an admirably small amount. Looking again at Steve's spire even with a straight edge applied I cannot see any of that there.

 

[dazedgonebye]

I'd love to see actual distortion numbers for this lens.
From this pretty casual look, they must be very low.

 

[kb244]

Nice... I too notice the lack of curve in the original image. But I think its a matter of perspective and such. Here one I did yesterday that exhibits the 'curve' from not keeping level on the horizon. (note: I also got the lens for the first time yesterday as well).

 

[kb244]

I'd love to see actual distortion numbers for this lens.
From this pretty casual look, they must be very low.

According to my co-worker it's just parrallax, if you keep the camera level and shoot straight on the horizon, than actual barrel distortion appears minimum.

 

[dazedgonebye]

That sort of wide angle distortion is unavoidable when not perfectly aligned. What is lacking is any sort of noticeable barrel distortion.
http://en.wikipedia.org/wiki/Barrel_distortion

 

[Dougg]

Nice... I too notice the lack of curve in the original image. But I think its a matter of perspective and such. Here one I did yesterday that exhibits the 'curve' from not keeping level on the horizon. (note: I also got the lens for the first time yesterday as well).

Hi Karl -- Your building shot is certainly a matter of perspective, with the camera tilted upward causing vertical lines to appear to converge.

But I don't see any "curve" there, which is what the railing shot reveals (if only just barely). Perspective distortion is simply an optical reality when the picture plane is not parallel to the subject plane. Curvilinear distortion such as pincushion and barrel distortion is an optical defect that can be corrected in designing the lens. Zeiss seems particularly devoted to minimizing this kind of distortion in their lenses.

Both can also be addressed on the computer using Photoshop, etc...

 

[kb244]

Hi Karl -- Your building shot is certainly a matter of perspective, with the camera tilted upward causing vertical lines to appear to converge.

But I don't see any "curve" there, which is what the railing shot reveals (if only just barely). Perspective distortion is simply an optical reality when the picture plane is not parallel to the subject plane. Curvilinear distortion such as pincushion and barrel distortion is an optical defect that can be corrected in designing the lens. Zeiss seems particularly devoted to minimizing this kind of distortion in their lenses.

Both can also be addressed on the computer using Photoshop, etc...

Point taken.