[eva2000]

Yesterday I received my Tamron SP AF17-50mm F/2.8 XR LD lens (far right) so decided to compare it to my Sigma 18-50mm f/2.8 EX DC Macro lens (middle).



It's first time doing comparison photos for lens like this. I decided to do a brick wall test first with Aperture priority mode and tried to maintain an exposure compensation value between +1.0-1.3 EV for both lens to match similar histogram curve.

All photos taken at ISO 125 and RAW DNG files imported into Lightroom 2 and resized without sharpening to 800 pixel width @85% JPEG Quality. Noticed the Sigma @50mm seems a bit wider than Tamron @50mm even though the distance/tripod setup remained the same ?

Updated: Part 2 with 100% crops posted here.

1. Sigma @18mm 1/160 sec at f / 2.8
2. Sigma @18mm 1/100 sec at f / 4.0
3. Sigma @18mm 1/25 sec at f / 8.0
4. Sigma @18mm 1/10 sec at f / 11
5. Sigma @18mm 1/6 sec at f / 14
6. Sigma @50mm 1/125 sec at f / 2.8
7. Sigma @50mm 1/60 sec at f / 4.0
8. Sigma @50mm 1/15 sec at f / 8.0
9. Sigma @50mm 1/6 sec at f / 11
10. Sigma @50mm 1/4 sec at f / 14

1. Tamron @17mm 1/80 sec at f / 2.8
2. Tamron @17mm 1/30 sec at f / 4.0
3. Tamron @17mm 1/8 sec at f / 8.0
4. Tamron @17mm 1/3 sec at f / 11
5. Tamron @17mm 1/2 sec at f / 14
6. Tamron @50mm 1/60 sec at f / 2.8
7. Tamron @50mm 1/30 sec at f / 4.0
8. Tamron @50mm 1/8 sec at f / 8.0
9. Tamron @50mm 1/4 sec at f / 11
10. Tamron @50mm 1/2 sec at f / 14