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Summicron 28mm-f/2-(2010)

distortion

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8 replies to this topic

#1 rimbaud

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Posted 19 June 2017 - 20:33

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I am new to the forum.

I wanted to inquire about a leica 28mm f/2 sum micron i purchased on eBay. It had a nick on the front element so it was a bit less expensive than usual. 

i read it supposedly has 1% distortion, or something along those lines. Doing some negatives today i ran across a mediocre shot, however noticed

quite a bit of distortion and wondered how this was possible given the claim i had read concerning this. Especially on the top right side it is going in a clockwise direction. However appears on the lower right the direction is counter-clockwise. Is this typical, or is there something dramatically wrong with this lens. 

 

Much thanks for any advise,

 

Richard

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Edited by rimbaud, 19 June 2017 - 20:39.


#2 a.noctilux

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Posted 19 June 2017 - 21:08

Difficult if not impossible to judge distortion in this image.

It's not an good example to show, it's not square to be compared.

 

I use Summicron-M asph 28mm for a while, geometric distortion is very mind.


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#3 rimbaud

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Posted 19 June 2017 - 21:39

Possibly i misunderstood type of distortion w/the lens. I can clearly see the wall in background-the horizontal line is very distorted. 

am i wrong in the type of distortion this lens was not supposed to have? 

 

Thank you.



#4 a.noctilux

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Posted 19 June 2017 - 22:02

Maybe, your image show here the distortion pointed is due to when you took the photo, you were not facing "square" in front of the shop.

Do you have other images when you were "square" placed.

 

Here is effective distortion of Summicron-M 28mm (from summilux.net site) of 1%

 

 

 

Summicron28Asph-DE.jpg



#5 rimbaud

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Posted 20 June 2017 - 00:37

yea, thanks, that probably is it. i will do a test in any case. 



#6 lct

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Posted 20 June 2017 - 00:55

It's perspective and reflections you're showing here, not distortion. Shooting at the middle of the window should correct horizontal perspective but better choose perfectly straight lines for that. The chart above doesn't lie, this lens has less than 1% distortion. 



#7 coogee

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Posted 20 June 2017 - 02:18

Definitely perspective distortion and probably not a totally flat window either, nothing to do with the lens.

My copy never shows anything I ever noticed in the real world, including horizons over sea. Enjoy! Super lens.

#8 Dougg

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Posted 20 June 2017 - 09:24

Mine shows very slight barrel distortion, corrected with a setting of 2 or 3 on the Lens Corrections panel distortion slider in Lightroom.

 

I agree that the example in post #1 is simply a matter of perspective, common to any lens. However wide angle lenses show it more strongly due to the nature of things. :)


Edited by Dougg, 20 June 2017 - 09:26.


#9 rimbaud

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Posted 20 June 2017 - 15:24

Understood. Thank you for your well informed replies. 




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