Speaking about design, what does close to zero distortion imply?

[Juan Valdenebro]

That might be a good idea, Sebastian, I just haven't found if it's as distortion free as the 2.8...
Thanks!

 

[sebastel]

let me prepare some test pics.

here is one - i'm a bit limited in the target selection at the moment, but maybe it helps already.
btw, i just checked the upper (horizontal) panel of this thing - it isn't straight, which disturbs the use of this picture for the purpose. i did not notice that before, only noticed it in the picture ...

 

[Juan Valdenebro]

You're so kind, Sebastel! Thanks a lot!
Lines look fine to me: there's a Summaron 35 3.5 in the classifieds right now for $200, and I just tried to buy it, but there was a buyer who sent a PM before me, so it looks like that one won't be mine...
Thanks!
Cheers,
Juan

 

[Juan Valdenebro]

I see there's also a 1957 Canon 35 3.5, six elements in four groups... Does anybody know about its distortion?
Cheers,
Juan