Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-14-2011, 11:05 AM   #1
Senior Member




Join Date: Feb 2011
Location: connecticut
Photos: Gallery
Posts: 248
what does MTF stand for ?

( as in lens testing data) ? and why is it significant?

03-14-2011, 11:10 AM - 1 Like   #2
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,768
Understanding Lens Contrast

QuoteQuote:
What is an MTF Chart?

Basically, how lenses are evaluated is by looking at how well they transmit evenly spaced lines of black and white; ten, 20, or 30 "line pairs per millimeter" (lp/mm) means exactly what it says. As these lines get more and more closely spaced, the "noise" between them blurs the edges and makes the black lines look dark gray and the white lines look light gray to the lens (and also to your eye, especially as you get farther away). As the lines get closer and closer together, pretty soon the lens canşt distinguish them tonally, and the lens "sees" one undifferentiated gray. This ability on the part of the lens, charted graphically, is what MTF, or Modulation Transfer Function, is all about.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, pentax help, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
MTF chart garyk Pentax SLR Lens Discussion 4 05-27-2010 06:27 AM
M 50mm MTF charts whojammyflip Pentax SLR Lens Discussion 25 02-14-2010 12:27 AM
Is there MTF graph of A50/1.2? ogl Pentax SLR Lens Discussion 1 09-16-2009 07:29 PM
MTF jucarbi Pentax DSLR Discussion 9 05-14-2008 09:56 AM



All times are GMT -7. The time now is 12:29 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top