Originally posted by: dug777
Originally posted by: virtuamike
Originally posted by: dug777
Originally posted by: virtuamike
You can get a used 18-70/3.5-4.5 for under $200. I'd rather shoot with that than any of the lenses you have listed.
I suspect that optically only the most dedicated pixel peeper could tell the difference between them in real world shooting conditions outside the lab between 18-70mm, and you get an very useful extra 65mm of range with the 18-135mm, as well as better magnification ratio for close-up
From Thom
Maximum aperture doesn't change the way you might expect with focal length. The relevant values are:
* 18mm f/3.5
* 24mm f/4
* 35mm f/4.5
* 50mm f/5
* 70mm and higher f/5.6
You're right - you probably can't tell the difference in terms of optics. But it's very easy to pick out which lens is faster
Sometimes range isn't all that it's cracked up to be, not when you're stuck at f/5.6.
That's not quite true, according to photozone it's f/5.3 at 70mm
Even if it's faster at 70mm, that it doesn't magically make up for the extra 65mm of range.
I'm not a pro like you, but I'm very happy with the results I get out of that extra 65mm even if it is limited in aperture.
It's also usually bright enough here that I'm targeting f/8 or above even at 135mm.
I've personally never noticed a CA issue, which Thom lists as the only reason he'd prefer the 18-70mm over the 18-135mm in his conclusion (and which is child's play to fix as I understand it).
Thom's conclusion with regard to the 18-200mm makes very little sense if you throw price into the equation, the 18-200mm is at least twice the price of the 18-135mm. You'd damn well hope it did EVERYTHING better (which it doesn't, it's not as sharp at least).
He wants a good-value all purpose lens. In my opinion the 18-135mm is a more flexible and versatile lens than the 18-70mm, and in the real world I haven't felt 'hamstrung' by it's relative lack of speed very often, and I certainly appreciate the extra reach.
Using both side by side would be the best way to see if it really bothered you I suppose, and I've only used them in separate instances.