Web Analytics RiceHigh's Pentax Blog: My Canon EF40mm Pancake Brick Wall Test (on 5DIII FF)

Friday, July 06, 2012

My Canon EF40mm Pancake Brick Wall Test (on 5DIII FF)

See: http://smg.photobucket.com/albums/v313/RiceHigh/5Ds/40mm_Pancake/EF40STM/

Do note that there is heavy asymmetric vignetting at the right side of my pictures which can be seen even when stopped down, although the effect is not as dominant.

A quick comparison to another previous brick wall test by another user of the same pancake lens found that the asymmetricity can be found on his samples, but surprising at the left side instead for his samples!

http://forums.dpreview.com/forums/read.asp?forum=1029&message=41817473

My that copy of the lens was replaced shortly afterwards anyway. The replacement seems to have better symmetricity on vignetting at all apertures and from f/4 and onwards the effect has been far less obvious.

After all, it seems that manufacturing a pancake lens is not as easy as imagined and even tighter QC may be required. I guess and hope that Canon has learned the lesson.

I bet Pentax had the same mistake when they first produced the DA40/2.8 pancake lens, as what I can see and compare the test results of the first sample of the lens against the latest, i.e., the DA40/2.8 XS. The XS lens looks far more symmetrical now. Nonetheless, this maybe due to sample variation anyway.

Btw, if the quality of the EF40/2.8 lens is not good enough, just buy a EF400/2.8L, which can be used as a big stone for throwing during a riot! ;-D Read this Reuters story:-

http://blogs.reuters.com/photographers-blog/2012/05/16/saving-the-canon-400mm-f2-8/

Comments (5)

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Barbarosa's avatar

Barbarosa · 662 weeks ago

If on that particular lens is written Pentax now you would yelling about bad qc about incompetence about doom of pentax etc.
but canon is pardoned
1 reply · active 662 weeks ago
I said that Pentax do have more experience for making pancake lenses and learned how to avoid the problem. Don't get it? Well, fanboyism really got people blind! :-o
Barbarosa's avatar

Barbarosa · 662 weeks ago

Yes, you concluded that AFTER seen that canon make bad pancake lens.
Well more fair would be that pentax is pancake lens sensei comparing to canon, but not, just cod one " pentax have more expirience"
Pure hate can make ppl blind and deaf.
I think that they are both lame.
the lens seems to have some heavy vignetting at f2.8 !

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