[tinmingw]

ching,我想買支超廣角鏡,
原本想canon 10-22,107'c wide angle
後來發現tamron 10-24 有109'c wide angle
但今天無意中發現sigma 的12-24mm有122'c wide angle.
我用500d,我想要wide,sigma聽說除fisheye外
sigma 的12-24mm該最勁了,我該選他嗎?thx

[王迦南]

Sigma的確是現今最廣角的非魚眼鏡頭，但這是對FF機而言。

該鏡在FF機上之視角達122度，但在APS-C機上則祇有92.1度。

[h0001244]

tinmingw hing, you cannot make good use of Sigma 12-24 on 500D
When you have full frame, you will see how ultra ultra wide 12-24 is.

But 12-24 put on your 500D is also wide.

[alexszeto]

無得咁比既~~~12-24上APS要x1.6呢~~~

[bb1032003]

Further to remind you that Canon need to x 1.6 for APS-C body (including 500 D) but Tamron as they used the factor x 1.55 (which is the average of Canon 1.6 and Nikon 1.5 since they produce lenses for both brands) so the angle of 109' may not be true when you put it on 500D be careful of their calculation and claims, you better check for their web site or leave let for the 10-24mm.