The User’s Review: Canon Zoom Lens EF 28-105mm 1:4-5.6 vs. 28-90mm 1:4-5.6 III

Similarities: 1:4-5.6; midrange zoom from 28mm; macro; plastic mount; 58mm filter; similar size when fully retracted.

Differences: 

	EF 28 – 105 mm	EF 28 – 90 mm III
Longest zoom mm	105	90
Macro m/ft	0.48/1.6	0.38/1.3
Shortest at moom length mm	28	50
Longest at moom length mm	105	90
Focus ring	Stable	On the front piece and move
Front piece	Not turning and moving with the focus ring	Turning and moving with the focus ring
Rear lens	Sealed on the barrel	Move with internal barrel

Conclusions: I prefer the 28-105mm zoom. It has 1) a wider zoom range, 2) internal focusing (lens length will not change with focusing), and 3) sealed rear end to avoid dust into the barrels from this end.