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Posts: 9,985
Registered: ‎08-13-2015

Re: Macro lens or Extension Tube


@RobertTheFat wrote:

@Waddizzle wrote:

@limvo05 wrote:

Here is a sample I took with a few minutes ago @200mm f/2.8 1/640 ISO100. Almost raw without editing. All I did here was to crop it to a 1x1 factor. 

 


The "1:1 crop factor" describes how the image is displayed on your monitor, not how the image might be cropped.  Your "1:1 crop factor" is actually a ratio, better known as a zoom ratio of 100%.  

 

The 1:1 ratio is describing that for each pixel in the image, one pixel will be used to display it on your monitor.  A 100% zoom ratio will look very different when viewed on monitors set to different display resolutions.


Yeah, he should have said "aspect ratio" instead of "crop factor", but I think we all understood what he meant. The stuff about pixels and monitors is irrelevant to his point.


I disagree.  

 

I do not thing he was describing an aspect ratio.  I am certain that he was trying to describe a "crop factor" of the original shot.  Many people conflate the displayed zoom ratio in their processing software with crop factor.  A 1:1 crop factor would imply no cropping, at all.

 

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"Doctor told me to get out and walk, so I bought a Canon."
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Posts: 12,744
Registered: ‎12-07-2012

Re: Macro lens or Extension Tube

"Many people conflate the displayed zoom ratio in their processing software with crop factor."

 

I don't know what the OP meant to say or imply.  I also don't know how other post editors work with the zooming and all.

But in Photoshop you select the Hand tool or the Zoom tool and click the 1:1 button in the Tool Options bar. Then choose view, actual pixels.  Press  Enter.  Or, you can zoom to 100% in the status bar and press Enter. You have 100% on screen.  Or, right-click the image and choose Actual Pixels.

EOS 1DX and 1D Mk IV and several lenses!
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Honored Contributor
Posts: 5,493
Registered: ‎06-25-2014

Re: Macro lens or Extension Tube


@Waddizzle wrote:

@RobertTheFat wrote:

@Waddizzle wrote:

@limvo05 wrote:

Here is a sample I took with a few minutes ago @200mm f/2.8 1/640 ISO100. Almost raw without editing. All I did here was to crop it to a 1x1 factor. 

 


The "1:1 crop factor" describes how the image is displayed on your monitor, not how the image might be cropped.  Your "1:1 crop factor" is actually a ratio, better known as a zoom ratio of 100%.  

 

The 1:1 ratio is describing that for each pixel in the image, one pixel will be used to display it on your monitor.  A 100% zoom ratio will look very different when viewed on monitors set to different display resolutions.


Yeah, he should have said "aspect ratio" instead of "crop factor", but I think we all understood what he meant. The stuff about pixels and monitors is irrelevant to his point.


I disagree.  

 

I do not thing he was describing an aspect ratio.  I am certain that he was trying to describe a "crop factor" of the original shot.  Many people conflate the displayed zoom ratio in their processing software with crop factor.  A 1:1 crop factor would imply no cropping, at all.

 


Only the OP can clarify the matter, should he elect to do so. But in defense of my interpretation of his intent, I'll simply point out that the picture, as submitted, is square. I.e, it has a 1:1 aspect ratio.

Bob
Philadelphia, Pennsylvania USA
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Posts: 12,744
Registered: ‎12-07-2012

Re: Macro lens or Extension Tube

"... is square. I.e, it has a 1:1 aspect ratio."

 

Good point.  Smiley Happy

EOS 1DX and 1D Mk IV and several lenses!
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