Alley in Pisa, Italy

by Lars Kotthoff

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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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32
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 ...
4
votes
2answers
474 views

How do you choose among different 70-300mm lens for Nikon DSLRs?

I have a Nikon D5100 and it's my first dSLR. I've played with the kit lens for a while and now want to explore the zoom category. I've shortlisted these 70-300mm lenses: Nikon AF Zoom-Nikkor ...
18
votes
9answers
17k 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 ...
11
votes
3answers
841 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? ...
0
votes
3answers
3k views

70-200mm lens: Canon or Sigma? f/2.8 or f/4?

I was thinking of buying a Canon EF 70-200m f2.8 mk1 (I would love to buy mk2 but here's a noticable difference in price, at least in my country), but after awhile I came to the conclusion that this ...
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 ...
15
votes
1answer
564 views

Clipped bokeh circles at max aperture with wide aperture, short focal length lenses

I recently purchased a Sigma 30mm f/1.4 lens for my Canon 450D and noticed soon that at least wide open, any bokeh circles in the lower half of an image (in landscape orientation) seem to have their ...
6
votes
1answer
348 views

When focusing at max zoom, focus is lost after zooming out. Is that normal?

On my Canon kit lens, I could completely zoom in, focus on the object and then zoom out to take the picture with the object still in focus. Now I have a Sigma 18-200mm (with a Canon 600D) and that ...
5
votes
3answers
2k 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 ...
5
votes
5answers
936 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 ...
10
votes
2answers
894 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 ...
6
votes
4answers
270 views

How do I clean the external forward-facing glass on my lens?

How do I clean the external forward-facing glass on my lens? Over the last year or so of use it has accumulated a little dust and a translucent smear mark. Nothing serious, but I'd like to remove ...
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 ...
7
votes
7answers
428 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 ...
1
vote
2answers
219 views

upgrading from kit lens [duplicate]

Am bit new to DSLR .Interested in landscape My problem I feel kit lens came along with my 650D is not giving me sharper images.(Culprit might be myself) Budget problem for upgrading to Canon lens ...
1
vote
2answers
2k views

What Canon/Tamron/Sigma standard zoom lens to choose?

I have a Canon 600D with a kit 18-55 f3.5-5.6 IS II lens. Now I want to upgrade it with my not very loose budget. Three main things I want to improve with a new lens are: larger aperture better ...
1
vote
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.
-3
votes
2answers
415 views

Cheap telephoto lens with zoom higher than AF-S DX VR Zoom-Nikkor 55-200mm

I currently own an AF-S DX VR Zoom-Nikkor 55-200mm f/4-5.6G IF-ED lens, but I feel that the 200mm maximum zoom is not enough always. I've found two cheap options: Sigma 70-300mm F4-5.6 DG Macro ...