Camera Labs

I'm just wondering, but does anyone think that I would be happier with the wider end of the 17-50 or the extra reach of the 28-75?

I want to hear some opinions on these lenses, as I am stuck in between the both of them. I'm looking for a decent portrait lens, and also something to replace my kit lens. I've heard many mixed reviews but just want to hear a few more.
I'm kind of price conscious, but I believe that I could save up for the 17-50mm f/2.8 if it's what's best.

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~A200 | 18-70 | 75-300 | 50 f/1.4~
Flickr

See here vs there
One goes wider, the other is full-frame (and thus has less vignetting on a APS-C body). So you have to decide what's more important for you!

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

i have a simmilar dillema.
Tamron 17-50 or Nikon 18-70 ?
Please, who has these lenses or tried adleast... wich is better ? i like the f2,8 from tamron. The barrel distorsion is greater at 18-70 than at 17-50 tamron.
wich is faster in focusing ? i want to get the lenses for Weddings and indoor events. Shooting in churcs... is difficult.. not enaugh light.. that's way i like so much the 17-50's F2,8.

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To get a feel of how the various focal lengths will appear check out this online Angle of View simulator. The page will take a while to load but once you have it you can always save the page (not the Bookmark) onto your computer for future reference.

Bob.

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OM-D E-M5 + ED 12-50mm, H-PS14042E, H-F007014E, L-RS014150E, M.ZUIKO DIGITAL 45mm 1:1.8.
Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.

ok, this is just about zoom. not about focusing speed, chromatic aberations, and other important stuff.
wich is better 18-70 nikon or 17-50 tamron ?

The Tamron 17-50 has extreme vignetting and CA but is quite sharp.
The Nikon 18-70 is much better color-corrected, but has not the same border-sharpness as the Tamron.
So, tough call

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses

The 28-75 has a nicer focal range for portraits but if you want to fully replace the kit lens, then you may find the wider focal lengths to be missing. Perhaps have a look at the EXIF info of your shots and see what kinda focal lengths you use the most. Remember, 28mm is equivalent to 42mm on a 35mm camera as compared to the 27mm of the kit lens. That's a big difference.

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Graham
Flickr

Sharpness is the most important factor to a lens like this...colors can be corrected in a RAW software with ease.

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Gear: Nikon D80, 18-105mm, 35mm F/1.8, 85mm F/1.8, SB-600
Visit my work here

Bahhh!

I think I'm just going to go with the 28-75mm. If I don't get a great copy I'll just replace it. I'm not into many landscape shots anyhow and if I do feel like it, I could pull out my kit lens or try the 28mm on for size. Thanks for the help! And that link for the simulator was REALLY helpful.

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~A200 | 18-70 | 75-300 | 50 f/1.4~
Flickr

Did you get this lens in the end, if so what do you think of it ? I am thinking about getting the 17-50 2.8 at he moment, not to replace the kit lens outright, more as a portrait lens.

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Nikon D90 - flickr

Actually, I did not go for the lens. I am in the process of saving up for a 30D so purchasing it now would be no help. But, I did change my mind about the lenses and saw that the 17-50mm is much better. So once I get my 30D, the 17-50 is going to be my kit lens.

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~A200 | 18-70 | 75-300 | 50 f/1.4~
Flickr

I’ve recently purchased a EOS 40D, with the Tamron 17-50mm lens, and i must say – it works an absolute treat!! Superb quality, and fairly light weight compared to other lenses - making it one of the best general purpose lenses about (in my opinion). Plus the constant f/2.8 does wonders!

I will later be buying a lens in the spectrum of around 70-300mm for the telephoto side of it. 
Enjoy – as I certainly am!