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First of all let me make myself's background clear.

I am a Canon user for film some 14 years ago, I used to use Canon EOS630 film back with the standard zoom EF28-70mm f3.5-4.

I quit Canon system due to its bad performance for wide angle lens not due to dark angles but the bad distoration.

I took mostly landscape so AUTOfocus is not critical for me and I have found Contax a more suitable system for myself.

I purchased Contax 167MT and subsequently a few Contax Carl Zeiss Lens a 18mm f/4, 45mm f/2.8, 60mm f/2.8 macro, 200mm f/4 and no more till now.

I am taking slide and film but was also interested in digital as this is gonna be the future (before DSLR I got G2 and Pentax Optio S).

Since Contax stop production for all its product, I have no choice but to goto DSLR of other brands, I buy mounts for my Carl Zeiss lens and use it on Canon 20D, because I am used to Canon system in my photography history.

I begin my Contax Film experience since 1999 until now.

Now if FF sensor causing the dark angles, I will say MOST LIKELY.

Forgive me for being such subjective...but let us forget which brand (Nikon, Canon, Olympus or whatsoever)....let us see the reason why film back is better than sensor.

Olympus website did say the answer (please forgive me if I extract anything wrong).

Extract from Olympus website:-

http://www.olympus-esystem.com/dea/products/e300/feature/index.html

Because the CCD image sensors used in digital cameras are flat, they are only able to accurately receive light that hits them straight on. For this reason, when a 35mm film camera lens is used with a digital camera, colour reproduction tends to be inaccurate and brightness insufficient at the image periphery, where light is apt to strike the CCD obliquely, making it impossible to realise the full potential of the CCD. Olympus's Zuiko Digital lenses, on the other hand, are designed exclusively for digital SLRs. By ensuring the same level of imaging quality at the periphery as in the center, these lenses are able to maximise the full potential of the E-300's 8-megapixel CCD. Also, since the Four Thirds System specifications result in a lens mount diameter that is much larger than the image circle, the combination of camera body and lens ensures that the light continues to travel in a straight line to the image sensor.

SO STRAIGHT LIGHT is the problem....with wide angle, straight lights is becoming more difficult.....I THINK.....

Any sensor no matter CMOS or CCD will have the same situation, if it is a 1.6x crop the problem won't appear, I think I don't need to explain, but FF will not escape with the problem unless there is new technology.

Here is a picture I took with my Contax Carl Zeiss Lens on Canon 20D body. I am only interested in Canon's sensor....unless I got a lot of $$$ I won't change to expensive Canon lens. But for doing fast job Canon lens is for sure. I am talking about the situation of myself (I only took landscape and slow objects). I do not mind using manual focus, even for cats. I only buy the sensor....which Contax cannot provide forever (I am not interested in digital N, those are Japanese design Carl Zeiss).<div></div>