I have Canon EOS 70d DSLR and I have two lenses as Canon 50mm f 1.8 and Sigma 70-300mm. I work with these lenses and it good. Now, I like to add some more lenses like some zoom lens like Canon 18-135mm as its is quite cheap and have seen good reviews on ebay and amazon sites. But I am confused now should I have to buy this lens or not? as I have two lenses which I have mentioned above, Does the needs of canon 18-135mm lens would be fulfill by that lenses or not? As one of the main features that I like to buy this lens is due to image stabilizer feature on it. So can anyone recommend me what should be the best options for buying lens.
closed as off-topic by mattdm, Philip Kendall, Itai, John Cavan♦ Mar 4 '14 at 14:15
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It depends on what you are missing with your current lenses.
The 18-135mm is a nice lens that can do a lot but it isn't very good at anything - it's relatively slow at f/3.5-f/5.6, 18mm is wide but not very wide, 135mm is long but not very long, the lens has ok but not great image quality, the auto-focus is ok (much better than the 50 f/1.8) but not great, the IS is ok but not the best, you get the point.
I have the 18-135 and I love it because it does almost everything I need on a daily basis - it covers everything I need to take photos at acceptable parent-child distance in acceptable quality and without swapping lenses.
if you want something that covers everything from sort-of-wide to sort-of-tele with ok quality then the 18-135 is for you. if you want anything more specific (or faster, or higher quality) there are better option out there.