Canon LTM Vignetting from my 35/2.8

Canon M39 M39 screw mount bodies/lenses
conradyiu

conradyiu

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I ran a test roll for my Canon 35/2.8, it seems that at low light situation, vignetting at corners occurs. Is it common on this lens or it's time to have it a CLA?
 
If it vignettes, it will do that in all kinds of light. Perhaps you think of low light because you used wide apertures. A CLA is not a cure for vignetting.
 
Yes, I tend to use it at f/2.8 for the test roll. Do you mean it is common for vignetting at large aperture for this kind of lens?
 
Light-falloff to the edges is inherent in all wide angle lenses with symmetrical design and small glass. The bigger the view of angle, the worse (cos4-law). Most noticeable with color slides, best to avoid with B&W.
 
In pictures other than those with plain backgrounds, it should not be objectionable. By f/4 or f/5.6 it should be gone. Were you using a hood, by the way?
 
Thanks for your advice. Sorry for my little knowledge about it. That is, it is common to wide angle lens with small glass and not a flaw of my 35/2.8, right? I did not use hood or filter.
I need to test for smaller aperture of my lens.
BTW, a very stupid question, at what situation should we use large aperture of wide angle and stil can avoid vignetting?
Thanks in advance.
 
I have not experienced vignetting from my 35/2.8, but I have not used it wide open looking for it.

I did have the 35/2, and it definitely did show vignetting.
 
Twp types of vignetting are going on. One is natural vignetting which is due to the angle of incidence (cosine 4th law). This will appear at any aperture and is greater as the angle of view increases. The second is mechanical vignetting which is caused by the lens barrel cutting the aperture off axis. This is apparent only at the largest apertures and all lenses suffer from this regardless of focal length.
 
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