Comments on: Photography 101 – Lenses, Light and Magnification http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification Discover how to use your digital camera with our Digital Photography Tips. We are a community of photographers of all experience levels who come together to learn, share and grow in our understanding of photography. Tue, 14 Feb 2012 15:26:14 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Venkatesh http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-216726 Venkatesh Sat, 15 Oct 2011 16:10:48 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-216726 Very well written. I felt as if i have finished reading whole bhagavath gita ( Holy epic ) in a minute ! I have learnt several aspects such crop factor, f numbers etc. Thanks for this wonderful lesson. Keep posting more !!! :) Very well written. I felt as if i have finished reading whole bhagavath gita ( Holy epic ) in a minute !
I have learnt several aspects such crop factor, f numbers etc. Thanks for this wonderful lesson. Keep posting more !!! :)

]]> By: Bozilla http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-206732 Bozilla Mon, 05 Sep 2011 23:16:00 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-206732 I cannot agree on the explanation of "fish eye" lens, it's not the appearance of the lens glass that counts, it the fact that it projects straight lines to curved lines that defines a "fish eye" lens. The opposite term is "rectilinear" lens, which keeps straight lines straight on the film/sensor. I cannot agree on the explanation of “fish eye” lens, it’s not the appearance of the lens glass that counts, it the fact that it projects straight lines to curved lines that defines a “fish eye” lens. The opposite term is “rectilinear” lens, which keeps straight lines straight on the film/sensor.

]]> By: Robert http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-132528 Robert Mon, 20 Sep 2010 11:18:56 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-132528 "Doubling the diameter actually more than doubles the brightness of the image" Doubling the diamatere will give you 4x bigger lense (area of a circle ?*r*r) if you double r its r*r its 4 time more light I think... but tell me if im wrong “Doubling the diameter actually more than doubles the brightness of the image”

Doubling the diamatere will give you 4x bigger lense (area of a circle ?*r*r)

if you double r its r*r its 4 time more light I think… but tell me if im wrong

]]> By: Chris Yeo http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-109993 Chris Yeo Wed, 19 May 2010 06:02:17 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-109993 how do you calculate the magnification level of an image when viewed through a PC? how do you calculate the magnification level of an image when viewed through a PC?

]]> By: Jessica http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-59632 Jessica Mon, 03 Aug 2009 04:36:02 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-59632 I love these lessons!!!! I love to learn anything about photography because one day I am going to start my own photography business. I just wish I had a camera do the homework lol I am trying to find a photography camera for sale so I can start I love these lessons!!!! I love to learn anything about photography because one day I am going to start my own photography business. I just wish I had a camera do the homework lol I am trying to find a photography camera for sale so I can start

]]> By: Dr.Nabeel http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-54955 Dr.Nabeel Fri, 26 Jun 2009 06:58:42 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-54955 Dear Niel, I will be grateful to know why lenses of same specifications give different picture resolution. Is it the abberation, the ghosting, the flare etc.?? Thank you Dear Niel,

I will be grateful to know why lenses of same specifications give different picture resolution. Is it the abberation, the ghosting, the flare etc.??

Thank you

]]> By: rocky http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-45589 rocky Thu, 19 Mar 2009 22:13:50 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-45589 I'm not so sure this so-called magnification from a smaller than full-frame sensor is illusory. According to my sources, there is a "system magnification"--perhaps not unlike the digital zoom that takes place with crop cameras as in the case of the following Nikon D300: "The image produced on the small-sensor DX (D300) will be enlarged more to produce output (print or screen) that matches the output of a longer focal length lens on a full-frame... camera. This 'enlargement' is a internal system magnification not a true lens magnification but the result is somewhat the same." [source: http://meanderingpassage.com/2008/09/08/photography-magnificationcrop-factor-d700-and-d300/] If true, this would suggest that while the image is not being magnified (since the focal length of the lens is unchanged) there is an enlargement that effectively does make the image bigger even though there may be a loss in image quality, I've tentatively confirmed the accuracy of the above by shooting a street sign from the same location with both 1.3X and a 1.6X crop factor cameras using the same lens, and in the case of the latter, the image appears to be larger and more legible. Go figure! I’m not so sure this so-called magnification from a smaller than full-frame sensor is illusory.

According to my sources, there is a “system magnification”–perhaps not unlike the digital zoom that takes place with crop cameras as in the case of the following Nikon D300:

“The image produced on the small-sensor DX (D300) will be enlarged more to produce output (print or screen) that matches the output of a longer focal length lens on a full-frame… camera. This ‘enlargement’ is a internal system magnification not a true lens magnification but the result is somewhat the same.”

[source: http://meanderingpassage.com/2008/09/08/photography-magnificationcrop-factor-d700-and-d300/

If true, this would suggest that while the image is not being magnified (since the focal length of the lens is unchanged) there is an enlargement that effectively does make the image bigger even though there may be a loss in image quality,

I’ve tentatively confirmed the accuracy of the above by shooting a street sign from the same location with both 1.3X and a 1.6X crop factor cameras using the same lens, and in the case of the latter, the image appears to be larger and more legible. Go figure!

]]> By: n shack http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-44493 n shack Fri, 06 Mar 2009 19:48:50 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-44493 Could not see or link to examples. Could not see or link to examples.

]]> By: catalin http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-30237 catalin Thu, 05 Jun 2008 11:07:03 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-30237 "Obviously if the sensor is smaller, it can see less of the image presented by the lens, thus the field of view is reduced and magnification is increased" There is no magnification at all. It's just an illusion because of the "crop" of a smaller sensor: ‘Crop’ is a fairly good term – the imaging area is physically smaller. Less of the image circle projected by the lens is used, therefore it is a crop. The image remains the same size at the film plane for a given lens and subject distance – it is in no way magnified. It does, however, take up a larger proportion of the (smaller) frame and so it is easy to see why some people call it a magnifying effect. This is also why a tele lens appears so much more powerful – the field or angle of view has been reduced..." http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.shtml “Obviously if the sensor is smaller, it can see less of the image presented by the lens, thus the field of view is reduced and magnification is increased”

There is no magnification at all. It’s just an illusion because of the “crop” of a smaller sensor:

‘Crop’ is a fairly good term – the imaging area is physically smaller. Less of the image circle projected by the lens is used, therefore it is a crop. The image remains the same size at the film plane for a given lens and subject distance – it is in no way magnified. It does, however, take up a larger proportion of the (smaller) frame and so it is easy to see why some people call it a magnifying effect. This is also why a tele lens appears so much more powerful – the field or angle of view has been reduced…”

http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.shtml

]]> By: Norman Tsai http://www.digital-photography-school.com/photography-101-lenses-light-and-magnification/comment-page-1#comment-25557 Norman Tsai Mon, 21 Apr 2008 16:22:56 +0000 http://digital-photography-school.com/blog/photography-101-lenses-light-and-magnification/#comment-25557 Same here. May she get well soon : ) Same here. May she get well soon : )

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