The pics are.
													
																	Tamron 17 50 2 8 para full frame. 
									
	
		
	
																	Only works on 1 6x and dx cameras won t work on 1 3x or 35mm or full frame cameras. 
																	Tamron lenses deliver a superb fusion of performance and value enabling today s high resolution dslrs to perform at their peak. 
																	17 50 is a very useful range with a dslr especially with the constant f 2 8 which makes low light shooting possible. 
																	Sigma 17 50 2 8 os hsm canon 5d mark ii ff full frame 17 50mm f2 8 22 iso 100 6400 without mic. 
															
													
									
	
		
	
																	Same as nikon s ed or canon s ud. 
																	The tamron is more flare resistant. 
																	That was true of the tamron predecessor pre vc tamron af 17 50mm f 2 8 xr di ii ld sp zl aspherical if zoom lens for canon digital slr cameras and it remains true in this model. 
																	Image stabilized lens quick shift autofocus also called direct manual focus dmf. 
															
													
									
	
		
	
																	Haven t shot that much with it yet but the few photos i ve taken suggest it s a keeper. 
																	Tamron di sp 15 30mm f 2 8 vc usd g2. 
																	Tamron di sp 15 30mm f 2 8 vc usd. 
																	This marketing baloney means. 
															
													
									
	
		
	
																	And world renown macro lenses. 
																	Tamron calls this the tamron 17 50mm f 2 8 xr di ii vc ld aspherical if. 
																	Of course the canon has 5mm over the tamron on the long end. 
																	Image stabilized lens autofocus lens. 
															
													
									
	
		
	
																	Lens line up includes a trio of fast f 2 8 sp zooms. 
																	Extra refractive index glass allows smaller size di ii. 
																	The canon s biggest advantage is the 3 stop image stabilizer that the tamron 17 50 lacks. 
																	The tamron 17 50mm f 2 8 xr di ii lens shows less vignetting than the canon. 
															
													
									
	
		
	
																	Tamron sp af 17 50mm f 2 8 xr di ii ld aspherical if lens with hood for canon international version no warranty 4 6 out of 5 stars 11 tamron 28 75mm f 2 8 for sony mirrorless full frame e mount tamron 6 year limited usa warranty. 
																	Vibration control same as nikon vr or canon is. 
																	New fast f 1 8 sp prime lens series. 
																	Although a friend has tried both and has said that the vc version is still markedly improved.