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5
votes
3answers
471 views

For MTF, why does 10 represent contrast while 30 represent resolution?

I'm trying to learn to read MTF charts. Everything is making sense to me, except why most explanations of MTF will refer to the 10 l/mm line as a measure of contrast while referring to the 30 l/mm ...
7
votes
2answers
221 views

What does it mean to excite aliases?

I recently came across the phrase 'excited aliases.' The phrase seems to be related to lens sharpness in some way. While a web search turns up the phrase a few times, I am unable to locate a decent ...
9
votes
3answers
2k views

Does change of lens affect a camera's megapixels?

I have a Nikon D40. It has only 6.1 MP. I am planning to buy additional lens for it. Can changing the lens of the camera increase or decrease the megapixels of the camera?
9
votes
1answer
894 views

Can the slant edge SFR method measure lens resolution greater than the Nyquist limit for the camera sensor?

The slant edge SFR method has become the standard for measuring resolution of lenses and camera systems. It works by scanning a five degree slanted edge to calculate a line spread function. This is ...
15
votes
3answers
5k views

What is the Nyquist Limit and what is its significance to photographers?

The Nyquist Limit is frequently mentioned in the context of lens and sensor resolution. What is it and what is its significance to photographers? Here is an example of it being used by DPReview.com ...
2
votes
1answer
319 views

Is the BxU measure of lens resolution still used by anyone?

The background In 2004 DxO released DxO Analyzer. It pioneered a new measure of lens resolution that it called BxU or Blur Experience Unit. Luminous Landscape reported on it (DxO Explained) and ...