Skip to main content

Questions tagged [mtf]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers
68 views

Am I correct that there are just two optical limitations to resolution / MTF: aberrations and diffraction?

Bit of a semantic (and potentially naive) question here really, but I'm writing an article and want to be sure I'm correct. Can everything that limits the MTF of a lens except the diffraction limit be ...
toucangaroo's user avatar
0 votes
1 answer
245 views

Is this MTF chart real?

I stumbled upon an MTF chart, which looks wrong. It's for Kowa LM5NCL lens: https://www.kowa-lenses.com/en/lm5ncl-mp-industrial-lens-c-mount?number=10097. Here is the chart in question: It shows the ...
Paul Jurczak's user avatar
3 votes
2 answers
386 views

How to calculate MTF ? Need help with the formula

I'm trying to reproduce MTF chart programmatically but I'm stuck at some point. I'm starting with a clean bar chart like this: I then take a picture of this pattern with a smartphone (printed on HD ...
Laurent's user avatar
  • 151
3 votes
1 answer
165 views

Using MTF, how can I discover the smallest detail a smartphone camera can resolve for use in generating QR codes?

Given a chart I created myself, resembling e-sfr charts, a smartphone and a MTF plot, how could I discover the smallest resolvable detail, dimension wise ? The problem with smartphones is that we don'...
Samuel Dubuis's user avatar
0 votes
1 answer
133 views

How do I transform LP/pixel to LP/PH in MTF plot?

I'm working on computing MTF plots for smartphone camera. I've a working code in Python inspired by plenty of codes found online, MATLAB, Peter Burns and his sfrmat etc.. which computes the data from ...
Samuel Dubuis's user avatar
0 votes
1 answer
590 views

What is considered a good / great LP/PH value?

After combing through ISO 12233 and reading multiple articles, I'm still unsure what LP/PH values are considered poor, good, or great. I just finished testing a Nikon D750 with an 18-70mm lens. I'm ...
Adrian Hood Sr's user avatar
0 votes
2 answers
74 views

Does adding a lens with a higher MTF50 in front of a lens with a lower MTF50 increase the MTF50 of the entire system?

I know that the MTF of an entire imaging system can be modeled by multiplying the MTF of each component (possibly because multiplication in spatial frequency domain is convolution in space?) So, let'...
Carpetfizz's user avatar
3 votes
2 answers
369 views

How to read and interpret this MTF Table in a Lens Specification?

I have a camera lens specification that shows the following table about the MTF. I have a few questions about how to read this chart: What does the On Axis, 30% Field, 60% Field, etc... mean? What ...
Gary's user avatar
  • 233
4 votes
1 answer
543 views

what does RIH mean in an MTF chart

I've read some guides to interpreting an MTF chart, but I can't find any information about the meaning of RIH. My thought an MTF chart would show line/mm curves, so ...
Anthony's user avatar
  • 155
6 votes
3 answers
2k 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 ...
erotsppa's user avatar
  • 3,298
1 vote
1 answer
2k views

How can I compare MTF50 to a manufacturer's MTF chart?

Currently working with a trial-copy of QuickMTF (Imatest's software kept crashing on me), and I'm trying to get some basic MTF readings for my Canon 85 f/1.8 lens on a 6D. My first set of test shots ...
user avatar
1 vote
1 answer
1k views

How to understand the picture height?

"The Spatial Frequency Response (MTF), shown to twice the Nyquise frequency. The key result is MTF50, the 50% MTF frequency, which corresponds to perceived image sharpness. It is given in cycles per ...
petalse's user avatar
  • 131
2 votes
1 answer
624 views

Can a lens's bokeh be predicted by reading an MTF chart?

I've heard people say that everything meaningful about a lens's optical performance can be determined simply by looking at the MTF charts — although nothing is mentioned of that under How do I ...
mattdm's user avatar
  • 143k
6 votes
5 answers
11k views

What are my options for an FX wide-angle prime to suit the D800's successor? [closed]

I have a D700 which I'm not planning to replace at this point in Nikon's product cycle. I'll porbably buy the D800's successor. Not because I don't like the D800 (especially its usability ...
James Youngman's user avatar
2 votes
4 answers
1k views

How can I compare the MTF results on Photozone from the Pentax SMC DA* 300mm with similar lenses from Canon and Nikon?

I have been researching the Pentax SMC DA* 300mm f/4 ED [IF] SDM as a possible wildlife lens to use with my K-5. There are only a limited number of reviews of the lens from reputable sources and even ...
Peter Byrne's user avatar
8 votes
1 answer
2k views

What does "distortion <XX%" mean in lens specs?

I'm going to buy a lens and I would like to understand what "distortion <XX%" means. It's a vari-focal 10-60mm lens, and mentions distortion <12-1%. ...
Raphael's user avatar
  • 143
2 votes
1 answer
563 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 ...
labnut's user avatar
  • 8,317
38 votes
4 answers
4k views

How do I interpret an MTF Chart?

As part of how Canon (and other lens makers) give technical information about their lenses, they supply an MTF (Modulation Transfer Function) chart. How do I read and interpret what the chart is ...
Alan's user avatar
  • 18.7k