View Full Version : comparing Tamron 28-75 f2.8 XR vs. Sigma 18-50 f2.8 EX

01-17-2006, 08:21 PM
so i want somthing in this range ($300-$400) & a large apature to use on my D70s (of course i want a lense that will be able to auto focus, etc. with D70s) how do these compare? pros and cons? biggest reason i should go with one and not the other?

in one corner: Tamron 28-75 f2.8 XR Di LD IF Aspherical AF Nikon Zoom Lens (IMP)

Link (http://www.digitalfotoclub.com/sc/from-froogle.asp?id=964599407&rf=froogle&dfdate=01_16_2006)

Tamron AF 28-75mm XR Di Zoom lens features Digitally Integrated Design featuring an optical system designed to meet the performance characteristics of digital SLR cameras.
Compatible with Nikon digital SLRs including Nikon D50, Nikon D70s, D70, D100, D2x, D2h, D1x, D1h and D1.
This is the most compact and lightest lens in its constant aperture zoom class.
The versatility of the fast 2.8 constant aperture will reshape your photographic horizons.
Lens Construction (Groups/Elements) 14/16.
Angle of View 75-32.
Type of Zooming Rotation.
Diaphragm Blade Number 7.
Minimum Aperture F/32.
Minimum Focus 0.33m (13'') (entire zoom range).
Macro Mag. Ratio 1:3.9 (at 75mm).


in the other corner: Sigma 18-50 f2.8 EX DC Nikon AF Digital Zoom Lens USA

link (http://www.digitalfotoclub.com/sc/from-pricegrabber.asp?id=964594429&rf=pg&dfdate=01_16_2006)

Sigma 18-50mm f/2.8 EX DC is a large aperture zoom lens designed specifically for use with Nikon autofocus digital SLR cameras, ie: Nikon D70, D100, D2h, D1x etc.
The Sigma EX lens series denotes excellence of engineering and new technology.
Compact and lightweight zoom despite large F2.8 constant aperture.
Excellent correction for various types of aberration provided by one SLD Special Low Dispersion glass element and two aspherical lenses.
Super Multi Layer (SML) coating reduces flare and ghosting from which digital cameras tend to suffer.
Focal Length: 18-50mm.
Minimum Aperture: F22.
Lens Construction: 15 Elements in 13 Groups.
Angle of View: 69.3- 27.9.
Number of Diaphragm Blades: 7.
Minimum Focusing Distance: 11 inches (28 cm.).
Maximum Magnification: 1:5.

01-17-2006, 08:57 PM
I went for the Sigma 18-50 f2.8 because there is a huge difference on the wide side of things from 18mm to 28mm while on telephoto there is not a big difference, not so much anyhow that it would be worth giving up the wide side for...just my thoughts on the 2 sizes... I think with either of these lenses, a longer telephoto will someday be wanted depending on the useage..I am not sure what the Tamron has but I like the metal mount that Sigma offers...

01-17-2006, 10:27 PM
I would also include the Sigma 24-70 f/2.8 EX DG MACRO DF. I have this lens and it is very sharp. Take a Look at Some Test Shots (http://www.dcresource.com/forums/showthread.php?t=15838)

01-18-2006, 03:16 AM
I used to own both, and found that in good lighting they were both capable of amazingly sharp and contrasty images. I personally found the 18-50 to be a more useful focal length for my stye of shooting, and used the 28-75 a lot less once I purchased it. Unfortunately, in really poor lighting (like a dark restaraunt) they both had trouble focusing (with the Sigma being worse than the Tamron because it would tell the body that it had locked focus when it hadn't - the Tamron would just hunt and not lock on). The Sigma also had trouble with the Canon OEM flash system.

Nikon has both a different AF system and flash system so YMMV. Optically both lenses were amazing. I actually did a small test here: http://www.bigredstudios.com/lens_comparisons.htm

Here are some real life samples I took with my Sigma 18-50:

and my Tamron 28-75:

01-18-2006, 04:10 AM
The new Sigma 17-70 just announced on DPReview may be worth a look.


01-18-2006, 04:30 AM
Interesting. Covers the range of both the 18-50 and the 28-75, but you sacrifice 1 and 1/3 stops at the zoom end (where you need the extra light the most).

01-18-2006, 05:41 AM
The new Sigma 17-70 just announced on DPReview may be worth a look.


does anyone know when is this going to be available? whats the estimated price? I'm intriged because more because it's minimum focus is about 7"

if it isn't going to be out for a while i don't have any lenses yet for my camera, so i wouldn't be able to do anything till i get one. :(

01-18-2006, 07:58 AM
Jamison.. I love thos photos taken with the Sigma! I have been tryin to decide what to get for wedding shoots. Its down to either that Sigma or the Nikon 50mm 1.8D prime. I like the idea of being able to zoom when needed. But man, that prime is so tack sharp... then again so are the Sigma shots you showed. What would you suggest?

01-18-2006, 08:45 AM
That's a tough one. Being a Canon shooter, I can't recommend the Sigma on Canon bodies for weddings because it could not focus at the dark wedding receptions I was shooting (even with the AF assist lights from the speedlight flashes I was using). In the daytime, it was a peach. Optically the Sigma is amazing...sharp throughout its aperture range (a couple of the sample pics I posted were at f2.8). You also can't beat the $400 price tag. But the lens with the best optics in the world won't help you much if it won't focus in difficult situations.

Having said that, the Nikon system has a completely different AF system than Canon and the lens may work better with it...

My Canon 50 f1.8 isn't the best for locking focus in difficult lighting either. Is the Nikon version any better?

From a practical standpoint, I'd take the convenience of a good zoom over the slight increase in image quality of a prime if I had to choose between them for a wedding. You don't always have a lot of room to move around at a wedding, and the ability to change the focal length from one spot, might mean the difference between getting a shot and missing it.

If you have the dough for it, the Nikon 17-55 f2.8 is just about the perfect wedding lens on an APSc body. It's the only Nikon lens I'm consistently jealous of (well, that and the 10.5 fisheye).

Sorry I couldn't give you a better answer. Any chance you could test out a Sigma 18-50 on your body at your local camera store?

01-18-2006, 09:57 AM
I wish I had the money for the Nikon zoom! Maybe down the road... way down the road! LOL I could go to the shop to try the Sigma but cant leave the store with it, they dont let you rent. I agree about having the versatility of the zoom, thats why I was/am favoring the Sigma over the prime. I was very impressed with the 2.8 shot you posted, even stopped down it appears very sharp. I think thats what I might go with. Thanks for you input, its great to hear form someone whos "been there-done that"! I am a big fan of your work, great photos and great composition.

01-18-2006, 10:56 AM
yes thanks for the input from everyone, i too have decided to go with the sigma after reading this forum, talking to some people and doing a little more searching on the web i am comfortable with my choice.

does anyone know of a place that i can get this for less than $385 (and is also a good vendor) the website i found is digital foto club - this one (http://www.digitalfotoclub.com/sc/from-pricegrabber.asp?id=964594429&rf=pg&dfdate=01_16_2006) also wondering if anyone has expericence with this vendor

01-18-2006, 11:51 AM
Best of luck with those lenses guys. Digital Foto CLub is pretty highly rated: http://www.resellerratings.com/seller2889.html