100% crop = ??? full frame size ???

on the different EOS bodies?
I think it would be good to have this somewhere and kept as a sticky...thanks for all your input.
If it's already somewhere I aplogize...and would thank you for the link...

Rebel
Rebel XT
Rebel XTI
Rebel XSI
Rebel XS

D30
D60
10D
20/30D = 32" x 48"
40D
50D

1D
1Ds
1D II
1D III

5D
5DII

it's called dpreview. they have ALL the cameras (except dsc models which you also left out) and now they have sensor size and pixel density (in pixels/cm^2). there is no point in repeating the same information while leaving out so much information that people will ask for.

Simple solution, ingrain this in your (and everyone elses') head: www.dpreview.com .

kitacanon wrote in post #7523330
on the different EOS bodies?
I think it would be good to have this somewhere and kept as a sticky...thanks for all your input.
If it's already somewhere I aplogize...and would thank you for the link...

Rebel
Rebel XT
Rebel XTI
Rebel XSI
Rebel XS

D30
D60
10D
20/30D
40D
50D

1D
1D II
1D III

5D
5DII

As long as you keep this going, and you format it a little better, I am sure it would be a good QR, but without looking this might already be in the "Start here" thread.

Edit: Ya it's covered pretty well in the Newbie guide. https://photography-on-the.net/forum/showthre​ad.php?t=414088

This is what DPR does in listing images size...I suppose I should have been more specific...I'm interested in knowing the PRINT size in inches, not pixel size...
for the 5DII
Image sizes (RAW) *
• 5616 x 3744 (21.0 MP)
• 3861 x 2574 (10.0 MP)
• 2784 x 1856 (5.2 MP)

I couldn't find it on the newbie link either

kitacanon wrote in post #7523460
This is what DPR does in listing images size...I suppose I should have been more specific...I'm interested in knowing the PRINT size in inches, not pixel size...
for the 5DII
Image sizes (RAW) *
• 5616 x 3744 (21.0 MP)
• 3861 x 2574 (10.0 MP)
• 2784 x 1856 (5.2 MP)

I couldn't find it on the newbie link either

That's because you're asking for the wrong thing. I could print a 2x3 pixel image at 200x300 miles if i wanted to. The result is 1/10000 dots per mile, or a nano dot per inch.

I say there are no stupid questions, only pointless, wrong, or vague ones. This is a wrong question.

kitacanon wrote in post #7523330
on the different EOS bodies?
I think it would be good to have this somewhere and kept as a sticky...thanks for all your input.
If it's already somewhere I aplogize...and would thank you for the link...

Rebel
Rebel XT
Rebel XTI
Rebel XSI
Rebel XS

D30
D60
10D
20/30D
40D
50D

1D
1D II
1D III

5D
5DII

You left out at least three cameras. Or not, I can't read...

I'd go more with pointless.

There is no single print size for any camera unless you specify two conditions:
1.No resampling.
2. A given ppi.

The flagship 1Ds is nowhere to be found.

nphsbuckeye wrote in post #7523794
You left out at least three cameras. Or not, I can't read...

...no pointless questions if you get the point...

...and there are such things as pointless replies...or at least unhelpful...
Let me try again...I would think it would be helpful to people who see the 100% crops as a standard of measurement....

...if you were to print the 100% crop AS IT APPEARS ON THE SCREEN, along with the rest of the image, what would the size of THAT full frame print be...?

...and I'm sure that any model left out could be added...it's an open inquiry...

People have said that 100% crops and pixel peepers are pointless because you have to consider that the size of the image would normally be seen at a distance...

I just would like to know what is in fact the size of the image if it were to be printed using the crop as the measurements from which the entire image is extrapolated...

kitacanon wrote in post #7524621
...and there are such things as pointless replies...or at least unhelpful...
Let me try again...I would think it would be helpful to people who see the 100% crops as a standard of measurement....

...if you were to print the 100% crop AS IT APPEARS ON THE SCREEN, along with the rest of the image, what would the size of THAT full frame print be...?

...and I'm sure that any model left out could be added...it's an open inquiry...

People have said that 100% crops and pixel peepers are pointless because you have to consider that the size of the image would normally be seen at a distance...

I just would like to know what is in fact the size of the image if it were to be printed using the crop as the measurements from which the entire image is extrapolated...

How big an image at 100% would print or display depends on the source resolution (which is determined by the body, as you've identified), but also on the output resolution. If it's displayed on a monitor, it could be 72 ppi, but might not be; if it is printed, then it could be anything from maybe 300 dpi to 4800 dpi or more.

Let's pick 72 dpi (mostly because pixel-peepers look at screens, not prints). It's easy enough to take the sensor size in pixels, divide each dimension by 72, and get a display size in inches.

The rest is left as an exercise for the reader.

Let me put the question into terms that might have some utillity.

Generally, optimum resolution for a print is considered around 300 ppi because that's the resolving capability of the average young human eye at "normal reading distance." Also, some people consider the best maximum enlargement of a digital image to be the largest size possible without interpolating (resampling, "uprezzing").

So sometimes you see the expression of an image's largest print size at 300 ppi. Take the given pixel dimensions and divide by 300.

RDKirk wrote in post #7524718
Let me put the question into terms that might have some utillity.

Generally, optimum resolution for a print is considered around 300 ppi because that's the resolving capability of the average young human eye at "normal reading distance." Also, some people consider the best maximum enlargement of a digital image to be the largest size possible without interpolating (resampling, "uprezzing").

So sometimes you see the expression of an image's largest print size at 300 ppi. Take the given pixel dimensions and divide by 300.

Thank you...I think...

OR as XARQI suggests...72dpi....ma​ybe I'll list both...


What other model am I missing...?

kitacanon wrote in post #7524621
...if you were to print the 100% crop AS IT APPEARS ON THE SCREEN, along with the rest of the image, what would the size of THAT full frame print be...?

Kinda depends on your screen size and resolution, eh? Not necessary really to correlate source viewing size to print output as it just adds another variable to account for.

But since you want a method, let's come up with one. Here's a formula you can use (patent pending ):


print full dimension = view crop size * view full res / view crop res


print full dimension: the dimension of the final print (either length or width, but stay consistent throughout the formula whichever you choose)

view crop size: physical dimension of the viewing medium (monitor in this case)

view full res: full res of the full image

view crop res: pixel dimension of image on screen

Anybody interested in a full mathematical formula derivation just let me know. Kinda hard to type out all those equations


Example case:
Let's assume a 5DII image viewed on a 26" 1920x1200 LCD. Why? Because my monitor is 26" 1920x1200 And let's pick length as our dimension to use in the formula. So:

view crop size = 21" (length of the 26" LCD)
view full res = 5616 (number of pixels in length of 5DII image)
view crop res = 1920 (number of pixels in length of LCD)

print full length = 21" * 5616 pixels / 1920 pixels = 61.425"

print full width = 61.425" * 2 / 3 = 40.95"

So if you view a 5DII image at 100% magnification on a 1920x1200 26" LCD, that's equivalent to looking at that big a portion of a print whose full size is 61.425" * 40.95". Somebody with as much obvious spare time as me feel free to check my math

Oh, the multiply by 2/3 to get the width is because Canon image aspect ratio is 3:2 length:width.

kitacanon wrote in post #7524621
...and there are such things as pointless replies...or at least unhelpful...
Let me try again...I would think it would be helpful to people who see the 100% crops as a standard of measurement....

...if you were to print the 100% crop AS IT APPEARS ON THE SCREEN, along with the rest of the image, what would the size of THAT full frame print be...?

...and I'm sure that any model left out could be added...it's an open inquiry...

People have said that 100% crops and pixel peepers are pointless because you have to consider that the size of the image would normally be seen at a distance...

I just would like to know what is in fact the size of the image if it were to be printed using the crop as the measurements from which the entire image is extrapolated...

No stupid questions, but sorry to say this is a stupid comment. As others and myself have said, you can print any size, so stating that is meaningless. Additionally, enlargement is function of sensor size in the non-resolution limited case (which most prints follow perfectly, only magazine prints or other specialty things are resolution limited even with 12mp images).

And if you didn't know, you can easily do most of the calculations you want to do according to that post in your head, and if you find that too slow, you can use a simple calculator. No point in putting tables up, it'd be like having multiplication tables for all numbers between 1 and 3000. I wouldn't even want to see that, and 99% of the values would be meaningless to me.