07-03-2011, 09:03 AM
[quote name='Albert' timestamp='1309671451' post='9721']
Hi folks, I'm seriously consiering building up a everyday & everywhere system with NEX and some M mount lenses. I'm not an expert on RF, but heard some argument that due to the very short flange distance, vignetting can be an serious problem for larger size cmos. It seem M8 and M9 solves this problem by using some sort of offset microlens. Not sure if NEX employ any similar machenism. Or maybe a APS-C cmos together with the sweet spot of FF lenses make corner vignetting a non-issue?
[/quote]
It does not do anything like Leica does with offset microlenses.
Of course, being only 1.5x crop helps a bit (m8 being 1.3x crop and M9 being FF).
But you will see enough light falloff towards the corners anyway. The photozone tests show this:
12mm voigtlander:
![[Image: vignetting.png]](http://www.opticallimits.com/images/8Reviews/lenses/voigtlander_12_56_nex/vignetting.png)
35mm Zeiss:
![[Image: vignetting.png]](http://www.opticallimits.com/images/8Reviews/lenses/zeiss_zm_35_2_nex/vignetting.png)
The extra light falloff due to sensor structure is only a problem at wider focal lengths, the wider, the more extreme it gets (similar to FF cameras from Nikon/Canon/Sony).
So, depending on how wide you go, it might be an issue (like the 12mm voigtlander) or no real issue at all. As you can see, the 35mm Zeiss does not really have a huge problem, only wide open showing really noticable falloff.
In fact, it looks better than the Sony 35mm f1.8 DT on normal A-mount:
![[Image: vignetting.png]](http://www.opticallimits.com/images/8Reviews/lenses/sony_35_18dt/vignetting.png)
And just a bit worse than a 35mm f2 lens on APS-C DSLR:
![[Image: vignetting.gif]](http://www.opticallimits.com/images/8Reviews/lenses/canon_35_2_50d/vignetting.gif)
So... in short: No, no sensor level light falloff measures. Yes, the vignetting can have an impact, but only with wide angle lenses, at 35mm it already is basically no problem. And the light falloff can be "corrected" in post processing, if needed/desired.
Hi folks, I'm seriously consiering building up a everyday & everywhere system with NEX and some M mount lenses. I'm not an expert on RF, but heard some argument that due to the very short flange distance, vignetting can be an serious problem for larger size cmos. It seem M8 and M9 solves this problem by using some sort of offset microlens. Not sure if NEX employ any similar machenism. Or maybe a APS-C cmos together with the sweet spot of FF lenses make corner vignetting a non-issue?
[/quote]
It does not do anything like Leica does with offset microlenses.
Of course, being only 1.5x crop helps a bit (m8 being 1.3x crop and M9 being FF).
But you will see enough light falloff towards the corners anyway. The photozone tests show this:
12mm voigtlander:
35mm Zeiss:
The extra light falloff due to sensor structure is only a problem at wider focal lengths, the wider, the more extreme it gets (similar to FF cameras from Nikon/Canon/Sony).
So, depending on how wide you go, it might be an issue (like the 12mm voigtlander) or no real issue at all. As you can see, the 35mm Zeiss does not really have a huge problem, only wide open showing really noticable falloff.
In fact, it looks better than the Sony 35mm f1.8 DT on normal A-mount:
And just a bit worse than a 35mm f2 lens on APS-C DSLR:
So... in short: No, no sensor level light falloff measures. Yes, the vignetting can have an impact, but only with wide angle lenses, at 35mm it already is basically no problem. And the light falloff can be "corrected" in post processing, if needed/desired.