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Archive 2014 · … EF lenses on a Crop Body

  
 
Jefferson
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p.1 #1 · p.1 #1 · … EF lenses on a Crop Body


When you put EF glass on a crop body … don’t you lose some the inherent resolving power of the lens … ? You just dump everything that doesn’t show on the sensor, no matter how many pixels you have

Of course, it can take care of those annoying corner sharpness problems …

Jefferson ...



Oct 22, 2014 at 07:26 PM
garyvot
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p.1 #2 · p.1 #2 · … EF lenses on a Crop Body


Canon's APS-C sensor has only about 38.5% of the surface area of a full frame sensor, so it seems to me that yes, you do lose a percentage of the potential resolving power of a lens designed for a larger format. You are, in effect, throwing away 60% of the image circle, and also magnifying any lens aberrations.

Beyond focus issues, I think this accounts for the differing experiences that users report using certain older prime lenses, which can look okay on full frame but fall apart on smaller sensors.



Oct 22, 2014 at 07:39 PM
kezeka
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p.1 #3 · p.1 #3 · … EF lenses on a Crop Body


Technically due to the pixel density of APS-C sensors being higher than the current canon FF sensors, you are taking more advantage of the resolving power of a lens because you have the potential for greater resolution at the sensor level.

It gets a bit murky when you start talking about resolving power per a perceived focal length at the sensor plane though. Not digging into that bag of chips.



Oct 22, 2014 at 08:30 PM
scalesusa
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p.1 #4 · p.1 #4 · … EF lenses on a Crop Body


With some lenses you gain performance, and with some, you lose a bit. Its not a issue. The issue is having a lens with a focal length that's not well matched to a crop sensor. A 24-70mm MK II is a great lens, but does not go wide enough for many, where as a 17-55 is the right zoom range.


Oct 23, 2014 at 09:11 PM
super35
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p.1 #5 · p.1 #5 · … EF lenses on a Crop Body


Yes, you do always lose resolving power with crop sensors compared to FF of similar megapixels. There is not a single EF lens in Canon's lineup that doesn't perform better on the 5D3 than on the 70D. An interesting example is comparing a spectacular EF-S lens on the 70D, like the Sigma 18-35, to the decent but not great 24-105L on the 5D3. They have about the same resolving power. Put a truly spectacular lens on both, like the Zeiss APO 135mm, and you see a large gap in favor of the 5D3.


Oct 23, 2014 at 11:22 PM





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