GTOz
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Regular Member
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Posts: 186
Re: Buying new lens - 17-40,17-55,24-105?
You will get a lot of different opinions from these forums. The answer for you depends on what you find is your major limitation with the lenses you currently have - most notably the 18-55. In the lenses you currently own you have a full range of focal lengths.
If the problem is low light, you will get some benefit from the 17-55 with its wider maximum aperture, but if you are getting a couple of stops at best with this. If, like me, this limitation is found in indoors pictures of people, then a good external flash is a more beneficial solution. If outdoors, you will find the wider aperture useful for discrete subjects, but of course this will not be useful if your subjects require greater depth of focus.
If the problem is focal length range, then the 17-55 (3.2 X zoom) does not help and the 15-85 (5.6X) is much better. As you have been using the 10-22 as a walkabout lens then I suspect that you may find the extra 3mm in the wide end of the 15-85 a major improvement on the 18mm of your kit lens. The 85mm long end is very good on your APS-C sensor. It is also lighter than the 17-55 (which I have not owned). Weight is an issue on cameras such as the "Rebel" series with smaller grips, as heavy lenses create much more work for the intrinsic muscles of your right hand in counteracting the forwards tip.
I started with a 28-135 from my film camera on my 400D (Rebel XTi) - which was very restrictive at the wide end, and added a 10-22 underneath this. I then found myself constantly changing lenses as the mid-20s focal length on APS-C is right in the middle of general shooting range for me, and was totally unworkable when out and about with young kids. The 15-85 was the ideal lens for my requirements. When I looked at my use of this lens in a search in Lightroom, I found that 15mm was my most common focal length at 25% of my shots! 20% were at 85mm and the rest scattered in between.
If you bought a 24-105 to use on an APS-C sensor you would likely suffer from this problem also, albeit to a slightly lesser extent. As somebody who appears to like the wider end, it seems that you would not be advised to get the 24-105. If you buy a full frame camera in the future you can get this then as a kit.
The only reason to get the 17-40 is that you may wish to buy a "full frame" camera in a couple of years time. If you choose this course, you will still be restricted on the long end of your walkabout lens for the next two years, and you may not change sensors at that time anyway! I recently bought this for my 6D to go under the 24-105 as I missed the wide angle I had with the 10-22 on my old camera. The 17-40 is great for me on full frame as I use it for landscapes where I am generally at f/11 or thereabouts so the corner softness at wider apertures has not been a problem. However I could not use it as a walkabout on the 400D as the ~2X zoom would be too limiting.
However your usage may be different to mine......