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.
30
votes
7answers
2k 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 ...
10
votes
3answers
665 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?
...
16
votes
9answers
11k 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 ...
3
votes
2answers
194 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 ...
5
votes
5answers
798 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 ...
4
votes
2answers
970 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 ...
11
votes
5answers
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 ...
10
votes
2answers
659 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 ...
5
votes
4answers
221 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 ...
7
votes
7answers
409 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 ...
6
votes
1answer
191 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 ...
6
votes
4answers
3k 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 ...
1
vote
2answers
837 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
3k 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.
