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Author Topic: Crop factor and FF crop post processing  (Read 2493 times)

Swiggen

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Crop factor and FF crop post processing
« on: December 21, 2012, 02:19:27 PM »
Forgive my ignorance but here is my question:

If I take a picture with a FF and crop it in Aperture to the same frame size as I would have with a 1.6 ASPC would the resolution /print quality still be the same?

Thanks in advance.

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Crop factor and FF crop post processing
« on: December 21, 2012, 02:19:27 PM »

neuroanatomist

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Re: Crop factor and FF crop post processing
« Reply #1 on: December 21, 2012, 02:22:55 PM »
IQ will be equivalent, but you'll have fewer MP (FF MP divided by 2.56).
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Sporgon

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Re: Crop factor and FF crop post processing
« Reply #2 on: December 21, 2012, 02:57:03 PM »
IQ will be equivalent, but you'll have fewer MP (FF MP divided by 2.56).

Unless you're packing a D800 in which case cropping to APS would be my only use for 36MP  :P

Swiggen

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Re: Crop factor and FF crop post processing
« Reply #3 on: December 21, 2012, 04:17:18 PM »
Thanks guys....will the difference be noticeable on a 30x40 print viewed from 3 metres

neuroanatomist

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Re: Crop factor and FF crop post processing
« Reply #4 on: December 21, 2012, 04:23:33 PM »
Most likely, yes.  Assuming you're talking about a 20-22 MP FF camera, the resulting ~8 MP likely will not do well as a 30x40" print.
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Jackson_Bill

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Re: Crop factor and FF crop post processing
« Reply #5 on: December 21, 2012, 04:53:11 PM »
IQ will be equivalent, but you'll have fewer MP (FF MP divided by 2.56).

Neuro - How are you defining IQ?

neuroanatomist

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Re: Crop factor and FF crop post processing
« Reply #6 on: December 21, 2012, 05:22:40 PM »
Loosely.  ;)  Basically, a combination of sharpness, noise, CA, etc.  From a similar generation (e.g. 5DII vs. 7D), there's little, if any, difference. Cropping a FF image takes away most of the advantages of the larger sensor.  But...if you can live with fewer MP (i.e. you're not making 30x40" prints), there's no downside to cropping the FF image, and a big upside if you don't need to crop.
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Re: Crop factor and FF crop post processing
« Reply #6 on: December 21, 2012, 05:22:40 PM »

PackLight

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Re: Crop factor and FF crop post processing
« Reply #7 on: December 21, 2012, 06:14:22 PM »
Thanks guys....will the difference be noticeable on a 30x40 print viewed from 3 metres

Doubtful it will hold up, although it will depend on your subject
How about this idea, just get a lens 1.6 times longer instead.


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Re: Crop factor and FF crop post processing
« Reply #9 on: December 21, 2012, 08:58:25 PM »
If your cropping a FF image to APS-C, the IQ will not be what it was unless you are printing or displaying small.  It will be somewhat similar to the APS-C image.
Thats why medium format is so popular for very large prints.

Swiggen

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Re: Crop factor and FF crop post processing
« Reply #10 on: December 21, 2012, 11:29:14 PM »
Many thanks. Very helpful

Swiggen

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Re: Crop factor and FF crop post processing
« Reply #11 on: December 22, 2012, 10:15:48 AM »
Many thanks. Very helpful

Sorry neglected to say this would be a 5D mk III......so I expect that would have a bearing on it.

My main interests are candid portraits of family and kids (hence low light uses but also interest in reach from crop) and landscapes.

So I am trying to have my cake and eat it or have my reach and high ISO!

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Re: Crop factor and FF crop post processing
« Reply #11 on: December 22, 2012, 10:15:48 AM »