Why there is no lens tests done for APS-H cameras?


TonyT

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Jun 13, 2009
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Just wondering why no lens reviews on APS-H cameras? When buying lenses, should we follow the reviews for APS-C ones or FF ones?

Any idea, anyone?
 

grantyale

Senior Member
Oct 4, 2004
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You may refer to the FF ones and perhaps ignore the far-edge numbers.
 

soons

Senior Member
Mar 22, 2007
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Size APS-H had been around since film area. APS-H can only use EF lens so just read the FF reviews and expect a better corner sharpness as lesser vignetting.
 

neech7

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Dec 17, 2009
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lens test? for a certain camera? i dont get it...shouldnt the lens perform the same regardless of which camera its on?
For a certain sensor size.
 

2evans

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Nov 8, 2007
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lens test? for a certain camera? i dont get it...shouldnt the lens perform the same regardless of which camera its on?
From dpreview on the Canon 70-200 IS USM, http://www.dpreview.com/lensreviews/canon_70-200_2p8_is_usm_c16/page6.asp

"However this excellent full-frame performance does come at some cost to APS-C users; perceived sharpness is reduced (due simply to the extra magnification imposed by the smaller sensor), and this amplifies the impression of softness wide open. Of course on APS-C the lens still benefits from the 'sweet spot' effects of extremely low distortion and negligible vignetting, so in the grand scheme of things this is something of a case of swings and roundabouts, with different benefits enjoyed by users of each format.

A comparison to Nikon's AF-S VR 70-200mm F2.8G is particularly interesting. The two lenses are near-identical in specification and price, but their characteristics are substantially different. The Nikon lens clearly outperforms the Canon for sharpness on the smaller DX/APS-C format, however this comes at the cost of rather compromised performance on full frame, with significantly higher distortion, vignetting and chromatic aberration, plus extremely soft corners. This leads us to conclude that the two lenses were optimized differently, the Canon for full frame and the Nikon for DX, and illustrates how the different demands of the two formats appear difficult to reconcile in a single lens design."
 

2evans

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Nov 8, 2007
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Just wondering why no lens reviews on APS-H cameras? When buying lenses, should we follow the reviews for APS-C ones or FF ones?

Any idea, anyone?
Law of scale... not worth it usually to test on something that will be used by less people.
 

megatops

New Member
Nov 16, 2009
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Just wondering why no lens reviews on APS-H cameras? When buying lenses, should we follow the reviews for APS-C ones or FF ones?

Any idea, anyone?
Use the review for FF and ignore around 1/5 of the frame's border.
 

ManWearPants

Senior Member
Jul 14, 2008
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if it is good enough for FF, it is good enough or APS-H. :) You do away with the weak edge performance and vignetting of the FF. This is the beauty of APS-H. The 1DMkIV is really a very appealing camera in this context.
 

TonyT

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Jun 13, 2009
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Thanks for all those responded! :thumbsup:

One more question on top. How can we tell which third party lenses are compatible with APS-H cameras? In all review/specs, they only mention FF or APS-C. Can we assume that those for FF are good for APS-H too?
 

engrmariano

Senior Member
Oct 18, 2007
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Thanks for all those responded! :thumbsup:

One more question on top. How can we tell which third party lenses are compatible with APS-H cameras? In all review/specs, they only mention FF or APS-C. Can we assume that those for FF are good for APS-H too?
basically, yes... but third party APS-C lenses are usable also on APS-H with abit vignetting.