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 Post subject: 100% crop?
PostPosted: Fri Aug 20, 2010 6:50 am 
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Joined: Tue Jul 27, 2010 8:57 am
Posts: 1551
Location: Winterpeg, Manisnowba, Canada
I'm not sure if I put this in the right category, though help would still be appreciated.

Over the past few weeks, I see images online that say "100% crop". What's the meaning of this? Keep it simple please!



Gear: 7 Nikon Nikkor AI-S and AF-S lenses, SB-700 flash, Nikon D7000, Nikon FM, variety of accessories

"There are no rules for good photographs, there are only good photographs."
- Ansel Adams

 Post subject:
PostPosted: Fri Aug 20, 2010 7:55 am 

Joined: Thu Mar 04, 2010 12:09 am
Posts: 466
Location: North
If you view a "100% crop" of an image you view it at 1:1 pixel ratio. This means that 1 pixel on the image is one 1 pixel on the screen.

When I pixel peep my images I view them at 100%. Usually just to check focus.

Canon 5D MkII -|- Sigma 24mm f/1.8 | Carl Zeiss 35mm f/2.0 | Canon 50mm f/1.4 | Canon 100mm f/2.8 Macro | Lensbaby Composer
Canon A-1 -|- Canon 28mm f/2 | Canon 35mm f/2.8 | Canon 50mm f/3.5 Macro

 Post subject:
PostPosted: Fri Aug 20, 2010 2:14 pm 

Joined: Sun Jul 04, 2010 4:52 pm
Posts: 244
Location: NB, Canada
An crop is when you take a picture, lets say of your house, and you select a small area of your picture, lets say a door handle, and you remove the rest of the image.

So, lets say your original image of the house is 5000 x 2500 pixels, which does not fit on your computer screen, so when you view it, you might view it at 25% or something like that, unless you set the zoom at 100% and only view some of the image.

Now, lets say your door knob is in that picture is 200 x 200 pixels, you can cut that out from the picture, and make a new file with it. That new 200 x 200 pixel file fits perfectly in your computer screen or a website, and is called a 100% crop. This way, you can show the quality of the image while viewed at 100% zoom, without having to share a 8mb picture that's 3 or 4 times bigger than your computer screen.

The reviewers show 100% crops to give you an idea what it would look like if you view the image at 100%. Lenses have different image quality (IQ) at different places of a picture, so Camera Labs website shows you the full pictures scaled down, so you know what you're looking at, and then shows you the 100% crop in the center of the picture, which is where the lenses perform best, and then near the border of the picture, where the lenses perform worst.

I hope that helps!

Cameras: Canon EOS 6D, Canon EOS Rebel T3i, Canon EOS Rebel T2i, Canon S90
Lenses: Tamron: SP 24-70mm F/2.8 Di VC USD, SP 70-300mm F/4-5.6 Di VC USD, Rokinon: 8mm Fisheye cine, Canon: EF-S 18-55mm f/3.5-5.6 IS Lens, 75-300mm f/4.0-5.6 III, and EF 50mm f/1.8 II
Retired camera: Fujifilm Finepix s700

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