Nikkor vs. Tamron vs. Sigma lenses | The Photography Forum
2012年10月3日 · Both those Tamron and Sigma lenses are highly rated... Both nikon's are better lenses. However, The Sigma 17-50mm f/2.8 EX DC OS HSM @ $600 is an AMAZING lens and compared to Nikon's 17-55mm f/2.8G ED-IF AF-S DX @ $1400 is a great choice. Don't forget to add Tokina to the mix... I'd pick their crop sensor UWA's any day over Nikons
full time manual focus on sigma lenses. - The Photography Forum
2014年3月23日 · On some lens you cannot manually adjust the focus ring when the lens is set to Auto (AF) mode. When full time MF is ON you can adjust manually the focus ring in both AF (auto) and MF (manual) modes. Thats what I think. I do have a …
Sigma -> Quantaray lenses. Any good? - The Photography Forum
2006年4月14日 · Sigma, who i'm sure you've heard of, made/makes a series of lenses and filters for www.ritzcamera.com called Quantaray. I currently use a 28-80 nikon and a 70-300 nikon. I currently use a 28-80 nikon and a 70-300 nikon.
Sigma, Tamron, or Tokina: Which and why? | The Photography …
2005年7月8日 · Sigma has traditionally made some of the worst quality lenses, really bad back focusing and just not very sharp... yet they also made the 18-50 HSM macro, which is so sharp it is visually sharper with the naked eye than the best equivalent lens from Nikkor (3 different independant magazines tested the Nikkor against the Tamron against the Sigma ...
Sigma Lenses - DG, DC, DUH? - Photography-on-the.net
2008年3月6日 · Sigma Lenses - DG, DC, DUH? in Canon Lenses
Parfocal? Sigma Lenses 70-200 2.8 OS - Focus Through the Zoom?
2011年6月8日 · Sigma Lenses 70-200 2.8 OS - Focus Through the Zoom? - Canon Digital Photography Forums Of course, the 200mm is going to appear to have less depth than the 70mm, due to the Depth of Field effect of a longer focal length.
Old Sigma lenses on Canon digital bodies - The Photography Forum
2009年10月4日 · I recently got a Canon 20D from eBay, and bought new a lovely 50mm 1.8. I also acquired/borrowed two EF fitting Sigma lenses which date back to film EOS cameras:Sigma Zoom - 28-200mm 1:3.5-5.6 DL Hyperzoom Macro and Sigma DL Zoom 75-300mm 1:4-5.6. Unfortunately, these virtually never work on...
Making Sirui Lenses - The Photography Forum
2016年10月21日 · Here is a video showing the making of Sigma Lenses. I don't know how old the actual photography is (I assume it is "current") but it is interesting to see that assembly seems to still be by hand. "The process of making a camera lens. The best optical equipment factory in Japan.", poste Nov 10...
Dreaded Sigma 70-200mm Autofocus problem - The Photography …
2008年5月1日 · In addition many new Sigma lenses are now shipping with a cap and USB interface that lets them plug into the computer; thus allowing the easy installation of new lens firmwire and negating the need to rechip when Canon/Nikon …
Sigma Art lenses with Sony E mount vs Sony G Master lenses
2019年4月16日 · The way they handle auto-focus might be different. The latest G Master 24mm F1.4 is much smaller than the Sigma equivalent, but the Sigma has a mechanically coupled manual focus while the G Master uses an electrical couple. You really need to read specific test reports of the lenses you are interested in using.
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