Sigma MC-11

The Sigma MC-11 adapter allows you to use Canon EF mount lenses on a Sony E mount camera, with autofocus capabilities! Officially, only the Sigma lenses are supported, but the adapter also works with most existing Canon EF lenses. You can get it for just 150$ when it is on sale, so it is quite aggressively priced compared to similar products such as the Metabones adapter.

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Canon EF 200mm f/2.8L II USM

The Canon EF 200mm f/2.8L II USM is an inexpensive telephoto prime lens for full frame cameras. It has been on the market for quite a while, a little over 20 years to be more precise. Can it still convince in terms of optical performance on a modern, high resolution camera? I have tested this lens with the Sigma MC-11 adapter on the Sony A7 III.

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How to check a lens for decentering

There are many things that can be wrong with a photographic lens. Optics require tight manufacturing tolerances in order to produce high resolution images. Copy to copy variation is a serious issue, even (or especially?) nowadays. While most lenses leave the factory in good condition, a non-negligible percentage reaches the market with unacceptable optical flaws. One of the most common issues is decentering.
Since this happend to me a few times already, I decided to write a short article about it. I will first explain what decentering means and then continue with a simple procedure on how to test a lens.

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How IBIS works and why the term “5-axis” is misleading

IBIS is short for in-body image stabilization. It is a way of optical shake reduction to help reduce or eliminate motion blur in photos. In contrast to traditional optical stabilization, instead of moving a glass element inside the lens, the camera sensor is shifted. All major manufacturers of mirrorless cameras nowadays offer at least one model with IBIS, e.g. Panasonic GH5, Fuji X-H1, Olympus OM-D or Sony A7 series. But how does it actually work? And what does 5-axis stabilization mean?

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Equivalence: How to compare different camera systems

As you may know, to compare lenses of different camera systems in terms of angle of view, the focal length often needs to be converted to an equivalent value. What about aperture and depth of field or the expected amount of noise? Are those values also comparable and if so, how?

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