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Nikon D7100 1.3x option
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Aug 20, 2015 18:26:11   #
Susieb721
 
I've just learned that my D7100 has an option to change the crop ratio to an (additional?) 1.3x. In quick comparison testing I can see that my image is indeed "closer" with the 1.3x. What can anyone tell me about this option? I have a couple of points I am concerned about and would appreciate any input.

My options for lens use are 35mm 1.8, 18-140mm variable, 80-200mm 2.8, and 17-55mm 2.8

* Will I get any vignetting, pin cushion or barrel on my images
* Will this decrease my image quality in any way.

I am thinking this would be a great feature for weddings where I am limited to the far back of the church. Thoughts?

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Aug 20, 2015 19:18:00   #
CHG_CANON (a regular here)
 
You always should capture the largest image possible and crop in post processing. You can't recover what has been removed in-camera. You lens correction profiles should continue to execute exactly the same as applied by the camera.

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Aug 20, 2015 19:19:12   #
oldtigger
 
Susieb721 wrote:
I've just learned that my D7100 has an option to change the crop ratio to an (additional?) 1.3x. In quick comparison testing I can see that my image is indeed "closer" with the 1.3x. .......I am thinking this would be a great feature for weddings where I am limited to the far back of the church. Thoughts?

That isn't the way it works.

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Aug 20, 2015 19:40:30   #
Susieb721
 
oldtigger wrote:
That isn't the way it works.


Help me understand how it DOES work?

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Aug 20, 2015 19:46:31   #
DaveO (a regular here)
 
Susieb721 wrote:
Help me understand how it DOES work?


I haven't gotten into it yet, but #4 mentions it. I did a quick google:

http://www.techradar.com/us/news/photography-video-capture/cameras/nikon-d7100-10-things-you-need-to-know-1132611

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Aug 20, 2015 19:52:43   #
LoneRangeFinder
 
Susieb721 wrote:
Help me understand how it DOES work?


All it does is crop the image while shooting. You would get the same sized image by shooting and then cropping. I haven't compared the loss of quality. Try doing both and comparing the quality BEFORE the job, not after.

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Aug 20, 2015 19:54:59   #
DaveO (a regular here)
 
Hopefully we'll get more info! The article I marked talked about a drop in resolution to 15.4 million pixels....

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Aug 20, 2015 19:55:35   #
Susieb721
 
LoneRangeFinder wrote:
All it does is crop the image while shooting. You would get the same sized image by shooting and then cropping. I haven't compared the loss of quality. Try doing both and comparing the quality BEFORE the job, not after.


Good point. Thank you.

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Aug 20, 2015 19:58:23   #
DaveO (a regular here)
 
Keep an eye out for this gent, Dngallagher. He's super knowledgable with the D7100 and a couple other things besides!

Meanwhile, I'll try to get ambitious soon!

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Aug 20, 2015 20:09:05   #
oldtigger
 
Susieb721 wrote:
Help me understand how it DOES work?

For all practical purposes all the 1.3 does is reduce your file size. reduce the area of your sensor which is used, and narrow your field of view.
Like the 1.5 crop factor, it adds nothing to your image and in fact works by throwing away most of what your lens sees.
It does not magnify the middle, it just trashes the edges.
Page 167 of your instruction book will show you how much is thrown away.
Make sense now?

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Aug 20, 2015 20:31:09   #
Susieb721
 
yes, thank you.

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Aug 20, 2015 21:15:28   #
TucsonCoyote
 
Just guessing here....
If this camera has WiFi capability it is a feature made to deal in some way with posting pics on the net directly.
As mentioned it reduces the size of your file thus reducing the quality somewhat too!

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Aug 20, 2015 21:53:22   #
MT Shooter (a regular here)
 
Susieb721 wrote:
I've just learned that my D7100 has an option to change the crop ratio to an (additional?) 1.3x. In quick comparison testing I can see that my image is indeed "closer" with the 1.3x. What can anyone tell me about this option? I have a couple of points I am concerned about and would appreciate any input.

My options for lens use are 35mm 1.8, 18-140mm variable, 80-200mm 2.8, and 17-55mm 2.8

* Will I get any vignetting, pin cushion or barrel on my images
* Will this decrease my image quality in any way.

I am thinking this would be a great feature for weddings where I am limited to the far back of the church. Thoughts?
I've just learned that my D7100 has an option to c... (show quote)


What the 1.3x crop mode does is reduce your sensor to the same as a Micro 4/3's sensor, that changes your actual total crop factor to 2x.

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Aug 20, 2015 22:17:41   #
oldtigger
 
MT Shooter wrote:
What the 1.3x crop mode does is reduce your sensor to the same as a Micro 4/3's sensor, that changes your actual total crop factor to 2x.

Which prompts the question:
Why would you want to do that if the same information at the same quality is available from the sensor in standard mode?

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Aug 21, 2015 01:01:50   #
OddJobber
 
Susieb721 wrote:
* Will I get any vignetting, pin cushion or barrel on my images
* Will this decrease my image quality in any way.

I am thinking this would be a great feature for weddings where I am limited to the far back of the church. Thoughts?


(1) No, you will get no vignetting or distortion since you're only using the middle part of the sensor.

(2) Yes, you will see a decrease in quality. You're turning off the outside pixels on the sensor and changing your image from 24 MP to 15 MP.

(3) I'm assuming, and hoping you're an Auntie With a Camera, relegated to the back of the church. Just take your 200mm and snap away, then deal with it in post processing.

(4) Please do yourself a favor and shoot some comparison shots before the next big event, view them at 100% magnification, and it will probably be a no-contest for image quality.

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