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Author Topic: Any suggestion before buying Zeiss lens or Canon L* lenses  (Read 16306 times)

sdrose

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Re: Any suggestion before buying Zeiss lens or Canon L* lenses
« Reply #15 on: April 27, 2011, 04:51:32 PM »
Does the 17-55 produce (on an APC-style camera) an image of equal high-quality to the 24-70? 

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Re: Any suggestion before buying Zeiss lens or Canon L* lenses
« Reply #15 on: April 27, 2011, 04:51:32 PM »

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Re: Any suggestion before buying Zeiss lens or Canon L* lenses
« Reply #16 on: April 27, 2011, 04:55:40 PM »
Does the 17-55 produce (on an APC-style camera) an image of equal high-quality to the 24-70?

In my experience it does, but if you are lucky enough to get a really good 24-70mm L, it will be equally good.

However, if you are holding the camera by hand, the 17-55mm IS makes it a better choice for slow shutter speeds.

sdrose

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Re: Any suggestion before buying Zeiss lens or Canon L* lenses
« Reply #17 on: April 27, 2011, 08:44:57 PM »
Ok, so I understand that the 24-70 on a smaller sensor camera is effectively going to be a 38-112.  Whereas the 17-55 is effectively going to be a 27- 88.  And, those numbers are only in regards to 'distance', and not perspective.  Nonetheless, I wanted to know the image quality of the 17-55 was equal to the 24-70.   I don't expect that I'll be looking to go too wide on this lens. 

Thanks!
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Re: Any suggestion before buying Zeiss lens or Canon L* lenses
« Reply #18 on: April 27, 2011, 09:19:43 PM »
Ok, so I understand that the 24-70 on a smaller sensor camera is effectively going to be a 38-112.  Whereas the 17-55 is effectively going to be a 27- 88.  And, those numbers are only in regards to 'distance', and not perspective.  Nonetheless, I wanted to know the image quality of the 17-55 was equal to the 24-70.

How do you define image quality?  When comparing the 24-70mm f/2.8L to the 17-55mm f/2.8 IS, with both used on a crop body, the 17-55mm delivers better resolution (i.e. is sharper) than the 24-70mm L, across the frame.  The 17-55mm also has less chromatic aberration than the 24-70mm L.  Since the 24-70mm projects a full frame image circle, the edges are cropped away on an APS-C sensor - that means compared to the 17-55mm, the 24-70mm has less distortion and vignetting.

Distortion, vignetting, and lateral CA are pretty easily and efectively corrected in post-processing of RAW images.  However, post-processing cannot effectiely restore resolution that was never captured in the first place.  So, overall I'd say that when comparing the 24-70mm f/2.8L to the 17-55mm f/2.8 IS, with both used on a crop body, the 17-55mm delivers better image quality, plus, it has IS (and incidentally, the 17-55mm also beats out the 24-105mm f/4L IS). 

Obviously, if you compare the 17-55mm on APS-C with either the 24-70mm or the 24-105mm on FF, the L lenses will deliver better IQ, because of the greater resolving capacity of the sensor sampling a FF image circle.
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Re: Any suggestion before buying Zeiss lens or Canon L* lenses
« Reply #18 on: April 27, 2011, 09:19:43 PM »