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Message: <blockquote data-quote="Ruidoso Bill" data-source="post: 344475" data-attributes="member: 753">I have done a lot of product photography, your sigma 105 is a very good lens for this (I own one), especially manually focused. I would not be using flash rather fixed lighting for the job. You shouldn't need to change exposure settings much once it's all set up. Use fixed  lights (even shop lights used in construction) a remote shutter and use the exposure meter within the camera. I have shot such items on black material and it worked out very well. You can adjust the white balance in Lightroom or Photoshop but concentrate on really well focused and sharp images, you will do just fine. Shoot in manual, manual focus, Highest f stop number the lighting permits, and watch what your shooting on the lcd. Good luck, sounds a little tedious.Ps Watch for and adjust your lighting to eliminate shadows.</blockquote>