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
![Nikon D7100 SIGMA 17-70 f2.8-4.5 レンズ付き ニコン 買い物をする テレビ・オーディオ・カメラ - 通販 - jalecosjuniorfeijaoatacado.upcatalogo.com.br!ショッピング Nikon D7100 SIGMA 17-70 f2.8-4.5 レンズ付き ニコン 買い物をする テレビ・オーディオ・カメラ - 通販 - jalecosjuniorfeijaoatacado.upcatalogo.com.br!ショッピング](https://static.mercdn.net/item/detail/orig/photos/m54677169848_2.jpg?1698205096)
Nikon D7100 SIGMA 17-70 f2.8-4.5 レンズ付き ニコン 買い物をする テレビ・オーディオ・カメラ - 通販 - jalecosjuniorfeijaoatacado.upcatalogo.com.br!ショッピング
![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
Nikon D7100 with Nikon 35 f/1.8G and Sigma 17-50 f/2.8: For Sale and Wanted Forum: Digital Photography Review
![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)