EOS to m 4/3 adapter with aperture function

A

Alpha Beta Omega

Veteran
I will get one of these to try on my Zeiss ZE primes. It has manual aperture blades built into the adapter so if it will work only testing can tell. It has 14 blades so interesting to see how it works.
Probably get it before Christmas.

View attachment 26781

Until Birger release their adapter...
 
wow .. I look forward to the tests and I wonder how the image will be affected by having the iris housed inside the rear element?

I can only assume the design of the EOS takes into consideration the position iris amongst its elements? Would this mean the amount

of image compromise would vary from lens to lens? From zoom to prime? Either way I await your findings with a lit of interest editman!
 
editman said:
... not work with most EF-S lenses only EF lenses.
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uurrg that f*cking sucks. 17-55/2.8 efs is the number one best eos to get for m43
edit:
thanks for the writeup btw. do you have a canon dslr so you can make comparison shots
as to differences of having iris before first element?
 
Mine arrived yesterday, too. Looks pretty solid.

Just wondering how the posterior aperture location affects the image. Any optics gurus out there know the answer to this?

Editman, looking forward to your tests on the 7D.
 
My guess is that it will work fine but not be the same thing as having the blades inside the lens, at the right place. I did some preliminary tests and I think you retain more shallow DOF than you would with the lens own aperture blades. It works as an extra iris but you will get deeper DOF depending on how each lens is constructed when stopping down, just not the same effect as when the lens itself stops down...
 
Looking forward to some comparison shots from this using EF glass, such as the 14/2.8 and 24/1.4 at various aperture settings ;)
 
How does it handle an 85 1.2 (where the rear element is as big as they come), or 50 1.2/1.4? Is the aperture effectively reduced because the adapter can only open up so far (say, the 50 1.4's wide open is now a 1.8 or whatever)?
 
I think it's big enough for the micro 4/3 sensor but not as big as the largest aperture lenses like that 85/1.2. You only use a part of the centre of full frame lenses to cover 4/3 sensors. I'll check with my Zeiss 85/1.4 which should be about the same size.
 
Just spoke with a guy who repairs lenses for Hasselblad cameras. He thinks this adapter will overall just control the intensity of light, but not in an even way, as it will vignette when it closes down. Also, in regards to depth of field it should have no effect, in other words, as the aperture decreases, your depth of field will not increase.

The question will be if the vignetting is objectionable...
 
I does definitively affect DOF in the 50-85mm area that's for sure and it does not vignette between 35mm and 100mm when you are within 1-6. I'll do some more testing from 14mm to 200mm with a plethora of lenses in a couple of hours.
 
editman said:
I does definitively affect DOF in the 50-85mm area that's for sure and it does not vignette between 35mm and 100mm when you are within 1-6. I'll do some more testing from 14mm to 200mm with a plethora of lenses in a couple of hours.
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Awesome! Pictures would be good ;)
 
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