![Sigma 17-50 Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Nikon D3200 D3300 D3400 D5200 D5300 D5500 D5600 D7000 D7100 D7200 D500 - AliExpress Sigma 17-50 Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Nikon D3200 D3300 D3400 D5200 D5300 D5500 D5600 D7000 D7100 D7200 D500 - AliExpress](https://ae01.alicdn.com/kf/HTB1.vHlKVXXXXaNXXXXq6xXFXXXT.jpg_640x640Q90.jpg_.webp)
Sigma 17-50 Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Nikon D3200 D3300 D3400 D5200 D5300 D5500 D5600 D7000 D7100 D7200 D500 - AliExpress
Might be some compatibility issue between the Nikon D7100 and the Sigma 17- 50 f2.8mm OS HSM and the Sigma 17-70mm lenses. | Unique F-Stop
![Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Nikon Digital DSLR Camera - International Version (No Warranty) : Electronics - Amazon.com Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Nikon Digital DSLR Camera - International Version (No Warranty) : Electronics - Amazon.com](https://m.media-amazon.com/images/I/71tOXc-NP+L.jpg)