Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-13-2008, 04:42 PM   #1
Veteran Member
rmtagg's Avatar

Join Date: Feb 2008
Location: Warrington, PA
Photos: Gallery
Posts: 1,271
What does this mean?

I see this when referring to Macro lenses- 1:3 ratio or 1:1 ???? What does this mean?

03-13-2008, 04:54 PM   #2
Veteran Member
Stratman's Avatar

Join Date: Mar 2007
Location: St Louis, Missouri U S A
Photos: Gallery | Albums
Posts: 2,464
Hm, I know 1:1 means it is a full macro, meaning full size magnification... 3:1 would be "less" macro than 1:1. In other words if you want a true macro lens, 1:1 is the way to go.
03-13-2008, 05:04 PM   #3
Veteran Member
rmtagg's Avatar

Join Date: Feb 2008
Location: Warrington, PA
Photos: Gallery
Posts: 1,271
Original Poster
QuoteOriginally posted by Stratman Quote
Hm, I know 1:1 means it is a full macro, meaning full size magnification... 3:1 would be "less" macro than 1:1. In other words if you want a true macro lens, 1:1 is the way to go.
So if it reads 1:3 this will give me a picture with the flower smaller than it is in real life? And a 1:1 would be life size?
03-13-2008, 05:05 PM   #4
Veteran Member
aegisphan's Avatar

Join Date: Nov 2007
Location: New Mexico
Posts: 815
1:1 means life size. Basically, that's the real size of the subject. So let's say an ant is about 10x smaller than the sensor. When you take its picture at 1:1, the ant will appear to be 10x smaller than the whole frame/picture. 1:3 means it will appear to be one third of the real life size. 3:1 means it will appear to be 3x bigger than the real life size.

Most dedicated macro will end up at 1:1. Some have even higher magnification (Canon and Nikon). You can increase your magnification through various means: teleconverter, extension tube, close up filter, bellow,etc.

03-13-2008, 05:08 PM   #5
Veteran Member
rmtagg's Avatar

Join Date: Feb 2008
Location: Warrington, PA
Photos: Gallery
Posts: 1,271
Original Poster
QuoteOriginally posted by aegisphan Quote
1:1 means life size. Basically, that's the real size of the subject. So let's say an ant is about 10x smaller than the sensor. When you take its picture at 1:1, the ant will appear to be 10x smaller than the whole frame/picture. 1:3 means it will appear to be one third of the real life size. 3:1 means it will appear to be 3x bigger than the real life size.

Most dedicated macro will end up at 1:1. Some have even higher magnification (Canon and Nikon). You can increase your magnification through various means: teleconverter, extension tube, close up filter, bellow,etc.
Wow! thanks for the info. It will help me make a better decision when making my purchase
03-13-2008, 05:08 PM   #6
Veteran Member
Stratman's Avatar

Join Date: Mar 2007
Location: St Louis, Missouri U S A
Photos: Gallery | Albums
Posts: 2,464
^^^ what he said, lol
03-13-2008, 06:55 PM   #7
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,528
A wordy explanation of reproduction ratios.

QuoteOriginally posted by rmtagg Quote
I see this when referring to Macro lenses- 1:3 ratio or 1:1 ???? What does this mean?
The numbers refer to the image size on the sensor or on film. Taking a 35mm film frame of 24x36 cm or 1x1.5 inches, and an object that measures 24x36mm will exactly fill the film frame when the lens is at 1:1 reproduction ratio. An object of a little less than 16x24 mm wll fill the frame on the APS-C sized digital sensor, which is a little bit less that 16x24mm.

A ratio of 1:3, means that an object 3X the size of the sensor will just fill the sensor.

A ratio of 3:1 means that an object will be 3X as large as the sensor, so if you take a picture of something 1/3 inch X 2/3 inch, it will just fill a film frame.

When you print it, of course, the print will now magnify the size of the object. If you print a 1:1 image on a piece of 8x10 inch paper, the object is now 12X as big as in real life (using the dSLR sensor).
03-14-2008, 08:03 AM   #8
Veteran Member
rmtagg's Avatar

Join Date: Feb 2008
Location: Warrington, PA
Photos: Gallery
Posts: 1,271
Original Poster
QuoteOriginally posted by Canada_Rockies Quote
The numbers refer to the image size on the sensor or on film. Taking a 35mm film frame of 24x36 cm or 1x1.5 inches, and an object that measures 24x36mm will exactly fill the film frame when the lens is at 1:1 reproduction ratio. An object of a little less than 16x24 mm wll fill the frame on the APS-C sized digital sensor, which is a little bit less that 16x24mm.

A ratio of 1:3, means that an object 3X the size of the sensor will just fill the sensor.

A ratio of 3:1 means that an object will be 3X as large as the sensor, so if you take a picture of something 1/3 inch X 2/3 inch, it will just fill a film frame.

When you print it, of course, the print will now magnify the size of the object. If you print a 1:1 image on a piece of 8x10 inch paper, the object is now 12X as big as in real life (using the dSLR sensor).
Ah, explained very well. Thank you

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!
k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -7. The time now is 07:58 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