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Sigma are a Japanese company which produce cameras, lenses and flashes. They're most widely known for their selection of lenses which are compatible with cameras from other manufacturers.

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3
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4answers
2k views

Why am I getting soft images with my Sigma 24-70 f2.8?

I recently purchased a Sigma 24-70mm f2.8 lens which I am using on a Canon 40D body. Around 8 of 10 shots were soft, regardless of subject matter. Exposure, white balance etc. all looks fine. I only ...
1
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5answers
4k views

What is the best 3rd party cheap lens for shooting events with canon 600D?

I would like to buy a 3rd party lens for my Canon 600D, I am looking more for shooting at events like parties. I'm looking for something cheap with a large zoom range.
2
votes
5answers
333 views

What to replace a mediocre Sigma 18-200mm with?

I'm thinking about options to replace my Sigma 18-200mm. I have a Canon T1i and a Canon 50mm f1.8. With the Sigma I wanted an "all round" solution, but as it turns out the lens is neither fast nor ...
5
votes
3answers
2k views

Which filters could I use with Sigma 8-16mm f/4.5-5.6?

I am very keen on purchasing the Sigma 8-16mm f/4.5-5.6 DC HSM lens, but one of the draw backs of this lens is that I can't put normal / standard filters on it. Can anyone please advise if I could ...
31
votes
8answers
3k views

Do I really need a fast 50mm lens?

Everyone I speak to says that a 50mm lens is the best and beats them all as an all-rounder. I was wondering whether to get myself a decent, fast 50mm as well. However I'm still not 100% sure whether I ...
2
votes
5answers
4k views

Sigma 150-500 f/5-6.3 vs Sigma 50-500 f/4-6.3 for birds in flight?

Finally made the decision to buy a Canon 7D for my wife. Her photography is continually improving. Flying bird and distance photography with her existing canon EOS 450D and 70 -300 lens. Can someone ...
2
votes
6answers
641 views

Which Telephoto Zoom Lens?

I am an enthusiastic hobbyist who uses the camera for social events/parties once or twice every week. My current kit is Canon 60D and for close up portraits, I am using Sigma 85mm F1.4 and for my ...
5
votes
3answers
1k views

What causes auto-focus “freezing”?

On occasion, the auto-focus system in my camera and/or lens just stops working. I'll be holding down the shutter release halfway and tracking a subject and I can feel/hear the auto-focus system ...
4
votes
5answers
1k views

Are Sigma DC 18-50 1:2.8 EX sharpness problems common with wide apertures?

I got this Sigma DC 18-50mm f/2.8 EX MACRO HSM lens few weeks ago, but I noticed considerable sharpness problems with wide apertures. Until f3.5 (or even f4.5) this lens can't really be used. I would ...
9
votes
3answers
1k views

Performance of Sigma 85mm F1.4 EX DGM on Canon 60D

As the Sigma 85mm f/1.4 EX DG HSM was originally designed for Full-frame cameras, how would the performance be affected if I use it on Canon 60D (APS-C camera). Q1) I need confirmation that this lens ...
2
votes
3answers
2k views

Is Sigma 17-70mm f/2.8-4 DC OS or Canon 17-55mm IS USM the better general purpose lens?

I'm looking for a new general purpose walk around lenses for my Canon XTI Rebel. Right now I have a the original Sigma 17-70 f/2.4-4.5 that does not have image stabilization, and looking to upgrade to ...
5
votes
5answers
910 views

macro lens for artwork with the T2i

This is a follow up to my first query about photographing artwork. There was a consensus that I go with a macro lens: Canon T2i for shooting artwork? I think I'm finally ready to purchase. I found ...
11
votes
3answers
787 views

What are differences between Bayer mosaic and Foveon 3 layer sensor?

To filling my appetite on camera things hunger I've came across to Sigma website and found this 3 layer sensor stuff. Can anyone really explain this based on their experience or research about this? ...
7
votes
7answers
427 views

How come some 3rd-party lenses cost more than those from the manufacturer?

I was trying to save some cash on a 50mm f/1.4 for my Nikon d7000. I see the Nikon 50mm f/1.4 costs almost $400 USD. I thought a 3rd-party lens would be cheaper so I checked out the equivalent Sigma ...
11
votes
3answers
929 views

What effect does the lens hood have on pictures and how does its shape impact that? [duplicate]

I have a Sigma 50mm lens f1.4 and it has a lens hood that has a sine wave shape going around the perimeter of the lens. I imagine this particular shape is useful for getting a particular effect and ...
11
votes
4answers
3k views

Is Canon EF 24-70mm f/2.8 L USM Lens that much better than Sigma 24-70mm f2.8?

I am looking for a 24-70mm f2.8 lens for general use and low light gig/concert photography. The 2 I am looking at are: Canon EF 24-70mm f/2.8 L USM Lens ...
2
votes
1answer
314 views

Which Better Beamer model for the Sigma EF-530 DG Super Flash

I'm looking to order a Better Beamer flash extender for my Sigma EF-530 DG Super flash however, I can't find which model would fit it. Anyone can point me to the right model? Thanks
18
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9answers
16k views

What features differentiate Nikkor and Tamron/Sigma lenses?

I'm wondering if anyone has an opinion about Nikkor vs. Tamron and/or Sigma lenses. Is it worth the extra money to purchase Nikkor lenses? I haven't had the chance to compare these. Are the Nikkor ...
10
votes
2answers
840 views

How can I determine if my Sigma 10-20mm lens copy is appropriately sharp and focusing right?

I just purchased a Sigma 10-20mm lens (Canon mount) and based on the reviews I was aware that many people receive copies of the lens that are soft or don't focus properly. I purchased from B&H, so ...
4
votes
3answers
484 views

The green light is blinking on D5000 when I mount a Sigma 24-70 EX DG Macro

I just got the lens. I know it doesn't autofocus on my camera body because it doesn't have built in motor but at least it should be usable in manual mode right?
5
votes
2answers
637 views

Which Nikon-mount Sigma macro zoom lens for a beginner?

I am a photography beginner. I have a Nikon D90 with the kit lens. I am planning to buy an additional lens. I started with a Canon S3IS, and shot some macro photos, which I think are good. I want ...
5
votes
2answers
783 views

Wider angle lens for indoor photography?

I'm an amateur photographer and only just picked up my first DSLR (went for a 50D with a basic 18-55mm Canon IS lens) and was considering purchasing a wider angle lens such as the Sigma 28mm f/1.8-22 ...
12
votes
4answers
1k views

Sigma 10-20mm f5.6 alternatives?

I've been wanting to add a wide angle lens to my collection for a while now. Sigma 10-20mm f5.6 looks good. I was looking at it about 2 years ago. I was wondering if there have been newer wide angle ...
9
votes
5answers
4k views

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

Specifically: Sigma 18-50mm f/2.8 EX DC Macro (not the previous non-macro version. HSM is only on Nikon fit) Vs. Tamron 17-50mm f2.8 SP XR Di II LD VC Lens (not the cheaper one without vibration ...
26
votes
9answers
1k views

Are Sigma lenses comparable to Canon lenses for a Canon camera?

I always feel that I should buy a Canon lens for my Canon camera, and Sigma would just be a cheap knock-off. Is that the case?