1. What is the DIY repair potential of a Sigma 24-70mm f2.8 EX DG Macro (non HSM) lens?

  2. How do these three 100-300mm lenses for Canon EF mount compare?

  3. Is it normal for Sigma lenses to stop working after a Nikon camera firmware update?

  4. Optimal all-encompassing lens set for Sony a6000

  5. Tamron or Sigma 70-300mm for Nikon ?
  6. Can't get my pictures sharp (Rebel Ti2 + tripod + Sigma 10-20 f/3.5 EX DC)

  7. How loud should the autofocus on the Sigma 10-20 f/3.5 be?
  8. Sigma Lens for Nikon AF D

  9. Do I need an adapter to mount a Sigma lens to a Canon Rebel Ti3?

  10. Is Sigma 150-600mm f 5-6.3 contemporary "F4-5.6" on Crop Sensor?

  11. Lens Recommendation on aps-c Nikon for Stock and Composites

  12. How good is Sigma 70-300mm F/4-5.6 DG Macro Lens
  13. Are third-party lenses compatible with Dual Pixel Autofocus (DPAF) on a Canon 80D?
  14. Will a Sigma 18-200mm F3.5-6.3 DC lens interfere with the mirror in a Nikon F70?
  15. Ideal way to focus for portrait photography using a prime lens with narrow depth of field?

  16. What caused the rainbow artifacts in the shadows in this image?
  17. Lens optic jumping between 17-24 on Sigma 17-70 f/2.8-4 DC Macro OS HSM

  18. Repair shop says my dropped Sigma Art lens is a write-off — but can I fix it myself?
  19. Bad focus. Is it me or my body (D7000)?
  20. How to fix the zoom ring in a Sigma 70-300 lens?

  21. Why doesn't my Sigma ring flash work in TTL mode with the Nikon D500 when it works fine with other Nikon Models?
  22. Glitching Autofocus on Sigma Lens

  23. 95mm circular polarizer: B+W, Sigma, or other?
  24. Is there a way to test an SLR's meter without a lens attached (or with a mismatching lens)?
  25. How important is it to buy the Sigma USB dock?

  26. Nikon D5500 Autofocus with Sigma DG 150-500mm 1:5-6.3 APO HSM
  27. Why Is Sigma DG lens cropping on Nikon D810?

  28. Wrong color representation in the image

  29. Can the Sigma TC-1401 1.4x Teleconverter be used with Canon lenses?

  30. Where can I find a Lightroom lens profile for a Sigma lens?
  31. upgrading from kit lens

  32. What do Pentax and Sigma DSLRs offer that differs from Canon and Nikon?

  33. Where can I get a replacement lens hood for my Sigma 28mm f1.8?
  34. Canon 7DM2 w Sigma 150-600 Sport - Lens micro-adjustment
  35. Which Nikon-mount lens is better for shooting birds and wildlife, Nikon 200-500mm or Sigma 150-600mm?
  36. Why is A mode on my Nikon D3300 overexposing at f/9 and higher?
  37. Will a Sigma 1.4tc teleconverter work with my Canon 70D?

  38. Which lens is sharper? The Sigma 18-50mm f2.8 or the Tamron 17-50mm f2.8?

  39. How weather-resistant are Sigma Art lenses?

  40. How does the lens calibration feature of Sigma Art lenses work?

  41. How do you choose among different 70-300mm lens for Nikon DSLRs?
  42. What does the word "Contemporary" mean in a lens description?

  43. Canon 7D2 with Sigma 150-600mm Sport - Camera locks up

  44. Why doesn't my Lens Flipper™ work with Sigma lenses?

  45. My lens doesn't have a zoom lock; does walking around with the lens fully extended damage it in any way?

  46. Can changing metering mode change focus?

  47. As an inexperienced user, how can I best take action photographs with a DSLR and consumer superzoom?

  48. Is there a focusing issue with the Sigma 17-50mm f/2.8 on a Canon 70D?
  49. Is there any wireless flash trigger compatible with the Sigma EF-610 DG ST flash and my Canon 1000D?
  50. Looking for extension tubes for Canon EOS 700D to be used on Sigma lenses?

  51. Is the Sigma 18-200 F3.5-6.3 DC Macro compatible with full-frame Nikon DSLRs?
  52. Sigma HSM lens won't focus on Nikon D5300

  53. Can Sigma lenses be converted from EF-S to EF for Canon?
  54. Why does my Sigma lens make a high-pitched ringing noise on my Canon camera?
  55. What should I do if AF isn't working on my lens after sending it to Sigma for a different repair?

  56. How do I disable autofocus on my Nikon with a Sigma 10-20, which has no manual focus switch?
  57. Sigma 18-35 f/1.8 poor image quality
  58. SIgma 70 - 300 APO DG Macro Lens Zoom doesn't working after 270
  59. Travel arrangements with Sigma Lenses?

  60. Does the Sigma 70-300 AF-D work on the Nikon D3200?
  61. Can RAW -> DNG convertion harm image data?

  62. Why don't Canon and Nikon lock out third-party lens makers?

  63. Is the new Sigma MC-11 Converter just another alternative to adapters such as metabones?

  64. What causes auto-focus "freezing"?

  65. Canon vs Sigma vs Tamron lenses?

  66. Zoom lens "pops" around a certain focal length. What failure is my lens showing?

  67. Sigma 18-35mm f/1.8 rattling sound

  68. How can I decide between the Sigma 10-20mm f3.5 or f/4-f5.6 for real estate?
  69. Cheap telephoto lens with zoom higher than AF-S DX VR Zoom-Nikkor 55-200mm

  70. Will old Sigma and Tamron EOS lenses work on Canon 600D?

  71. Compatibility of Canon teleconverters with non-Canon lenses
  72. Do I really need a fast 50mm lens?

  73. How do the 50mm f/1.4 lenses from Sigma and Canon compare?

  74. Is focusing problems on Sigma lenses still a problem on a Canon body?
  75. Why are photos taken with my old lenses all out of focus on my new Nikon D5300 body?
  76. How do you add lens profiles to Adobe Lightroom?
  77. Which mount is this Sigma lens for?

  78. Why does my lens refocus when the f-stop is changed?

  79. TTL seems not to work on D7000 with sigma ring flash for dental photography

  80. Can a Sigma dp3 quattro be used for Macro Photography?
  81. Is Sigma AF 70-300 f/4.0-5.6 DG APO Macro compatible with Nikon D5100?

  82. How is the quality of the Sigma 18-300 DC Macro lens?

  83. what is the camera fstop and lens fstop correlation?

  84. High Speed Sync with Canon 7D and Sigma EF-610 DG Super

  85. Results of a Sigma 12-24mm Full Frame Ultra wide lens on a Canon 70D

  86. Can the Sigma 2x teleconverter be hacked so it will work with the Sigma 50-500mm?
  87. Canon 1000D and sigma ef-610 flash issues

  88. Which Low light zoom lens with image stabilization for DSLR
  89. Is it worth to buy old Sigma lens instead of Nikkor?

  90. What Nikon cameras is a Sigma AF-k lens compatible with?

  91. How does the Minolta AF 24 mm f2.8 compare to the Sigma AF 24mm F2.8?
  92. Are Sigma lenses comparable to Canon lenses for a Canon camera?
  93. Which polarizer is better

  94. What should I buy? (new body vs. lens)

  95. Sigma 18-35mm F1.8 Canon

  96. is there a real difference between "digital" and "film" lenses?
  97. Sigma 17-50 f/2.8 or Sigma 17-70 f/2.8-4 (C) for Canon 600D

  98. How do I find the filter size for Sigma lenses?

  99. Looking for sigma adaptor to canon EOS 550d
  100. Blurry Pictures. Lighting fine.