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A photographic lens is used to focus the light onto film or a digital sensor. Many cameras have interchangeable lens systems, allowing the photographer to choose the type of lens to use.

4 votes
1 answer
535 views

What is meant by 'centering quality'?

I'm reading lens reviews and I have encountered the term 'centering quality' a few times (e.g. http://www.photozone.de/sony_nex/720-sony50f18nex?start=1). What does this term mean? …
Kirk Broadhurst's user avatar
13 votes
1 answer
22k views

What is the 'Maximum Reproduction Ratio' of a lens?

A review of a Sigma 19mm f2.8 lens contains the following line It has a minimum focusing distance of 20cm /7.9in and a maximum reproduction ratio of 1:7.4. …
Kirk Broadhurst's user avatar
7 votes
1 answer
594 views

What causes this bluish tint and other anomalies in this image?

The lens was at widest or very wide aperture - is there simply too much light coming through to the sensor? … Note also the distortion in the trees behind the bicycle seat - is this just a low quality lens? Or is this because it's a macro lens, and not intended for this type of shot? …
Kirk Broadhurst's user avatar