42 votes
Accepted

What does the word "Contemporary" mean in a lens description?

This is a Sigma name for one of their lens lines. It is not a general purpose term and really only has the marketing meaning Sigma ascribes to it. From the Sigma website, that definition is: ...
mattdm's user avatar
  • 143k
27 votes
Accepted

What caused the rainbow artifacts in the shadows in this image?

Because that rainbow is partially obscured by your subject, I would tend to believe that it has nothing to do with any of your equipment. Rather, there was something in the room acting as a prism and ...
twalberg's user avatar
  • 5,138
15 votes
Accepted

Canon EOS 6D mark II with Sigma Lens looks weird on LCD Monitor

Based on your comment, you have a Sigma 17-70mm f/2.8-4 DC Macro OS HSM Lens, which is an APS-C lens, on a full-frame camera. An APS-C sensor is smaller than a full-frame sensor, so the lenses that ...
Gern Blanston's user avatar
15 votes

Rings in SOME of my canon 5D mIV shots

It is a common problem when using some 3rd party lenses. Just turn off the in-camera lens corrections.
Mike Sowsun's user avatar
  • 12.2k
9 votes

Canon EOS 6D mark II with Sigma Lens looks weird on LCD Monitor

You are apparently using a Sigma DC lens on the full frame Canon EOS 6D. Sigma DC lenses are designed to be used on "crop body" cameras. That is, cameras with APS-C or smaller sensors. APS-C sensors ...
Michael C's user avatar
  • 175k
8 votes
Accepted

Sigma's for Sony can be calibrated with Sigma Docker. What about Sony lenses?

The Sigma dock only works with select Sigma lenses. The lens needs to have the needed firmware to respond to the commands sent by the dock. Even Sigma lenses that are not part of their 'Global Vision' ...
Michael C's user avatar
  • 175k
7 votes
Accepted

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

Is there a reason why Canon and Nikon allow third party makers to make lens that provide similar specs to first-party lens such are AF, IS and aperture control when they sell for less? Controlling a ...
Caleb's user avatar
  • 31.7k
7 votes
Accepted

Why am I able to set wider aperture than my lens technically allows?

This is probably because some cameras disable autofocus at slow apertures. The camera manufacturers think that performance won't be good enough, and so they disable it. The third-party lens is ...
mattdm's user avatar
  • 143k
6 votes

Is there a focusing issue with the Sigma 17-50mm f/2.8 on a Canon 70D?

The first sample image in the question is focused well in front of the central pillar. The second is focused well behind the flowers. You have told us that you are using single point AF but you haven'...
Michael C's user avatar
  • 175k
6 votes
Accepted

Tamron or Sigma 70-300mm for Nikon ?

Neither of those lenses are really what most macro specialists would consider a macro lens. For a lens to be considered a true macro lens it should be able to project a life sized image of the subject ...
Michael C's user avatar
  • 175k
6 votes

Why doesn't my Sigma ring flash work in TTL mode with the Nikon D500 when it works fine with other Nikon Models?

Nikon doesn't tell Sigma how their TTL protocol works (and Sigma does not pay to license it). The communication is reverse engineered. Sometimes, the protocol used varies slightly from camera body ...
mattdm's user avatar
  • 143k
6 votes

Why won't my dSLR take photos with my Sigma 24-70 lens?

It sounds like your Sigma 24-70 has sticking aperture blades. If it happens only intermittently, you can try and free them up. Select a small aperture like f/22 and use your depth of field preview ...
Mike Sowsun's user avatar
  • 12.2k
6 votes

Does it make sense to buy a Sigma Art f1.4 for a crop sensor body?

However, if I understand correctly the aperture need to be multiplied as well, which results in an f2.1 and means I am losing at least an f-stop. In short: No. If you use a FF-lens with an APS-C ...
Lothar's user avatar
  • 292
6 votes

Large double onion ring in the middle of shoots when i useing Sigma 35mm f1.4 DG HSM Art lens on my Canon 6D mark ii

Yes, DG lens serie from Sigma are compatible with fullframe cameras. About the effect seems like you enable in-camera lens correction. And this correct do not work well with 3th party lenses. Check ...
Romeo Ninov's user avatar
6 votes
Accepted

Why do these images from my Sony a7III have a dark semi-circle on the left side?

Sorry for the bad news: Semi circular artifacts especially on a fast shutter speed are usually an early indication of shutter failure on the a7 III. Examples: Please inspect the edges of your shutter ...
Kai Mattern's user avatar
  • 4,273
5 votes

Will a Sigma 1.4tc teleconverter work with my Canon 70D?

Any teleconverter/extender made for the Canon EF mount will work with your camera. Your question should be, "Which teleconverter would work with my lens." The short answer: It depends on what you ...
Michael C's user avatar
  • 175k
5 votes
Accepted

Why Is Sigma DG lens cropping on Nikon D810?

It's possible the lens is miscommunicating with your camera. If the camera's Auto DX crop setting (under Shooting Menu > ...
scottbb's user avatar
  • 32.7k
5 votes

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

Most/some third-party lenses report better apertures than they actually have - e.g. with f/6.3, the ...
flolilo's user avatar
  • 6,468
5 votes
Accepted

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

All three of these lenses are older designs from almost thirty years ago at the infancy of the autofocus era that gave birth to the Canon EOS platform. With lenses in the same basic class that are ...
Michael C's user avatar
  • 175k
5 votes

Does it make sense to buy a Sigma Art f1.4 for a crop sensor body?

You will never lose any transmission stops (low light ability) using a smaller sensor, unless something behind the camera mount severely constrains what reaches the sensor (unlikely with general ...
rackandboneman's user avatar
5 votes

Large double onion ring in the middle of shoots when i useing Sigma 35mm f1.4 DG HSM Art lens on my Canon 6D mark ii

This is a known issue when using certain third party lenses with certain Canon cameras that have in camera lens correction enabled. It seems almost totally random which camera and lens combinations ...
Michael C's user avatar
  • 175k
4 votes

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

Canon filed their patent on the EF mount in 1987, so it expired in 2007. Additionally, clean room reverse engineering to adapt to an interface is not protected by patent. Canikon could block sigma ...
Unkle George's user avatar
4 votes

Does the Sigma 70-300 AF-D work on the Nikon D3200?

Your lens will work on your camera, but it will need to be manually focused. The seller may have technically been correct while intentionally being a bit misleading: it is an autofocus lens and it can ...
Michael C's user avatar
  • 175k
4 votes

Sigma HSM lens won't focus on Nikon D5300

Sigma issued an advisory about compatibility with the D5300 in late 2013. They have released firmware updates for lenses that can be upgraded via their USB dock. Unfortunately, the 70-200mm f/2.8 ...
scottbb's user avatar
  • 32.7k
4 votes

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

The biggest handicap you're going to have to deal with when using that lens for sports is the relative narrow maximum aperture. At the longest focal length, which you're going to be using most often, ...
Michael C's user avatar
  • 175k
4 votes
Accepted

Can Sigma lenses be converted from EF-S to EF for Canon?

No. It's not a mount issue—it's a glass issue. Sigma's mount conversion is to change between different mount systems so it will physically mount and electronically communicate to the system of your ...
inkista's user avatar
  • 52.1k
4 votes
Accepted

Are third-party lenses compatible with Dual Pixel Autofocus (DPAF) on a Canon 80D?

Yes, assuming: The third party lens is an autofocus lens. The third party lens is compatible with the Canon EF mount. The third party lens is compatible with the 80D with regards to any type of ...
Michael C's user avatar
  • 175k
4 votes

Sigma DC 18-250mm Macro HSM Lens Autofocus not locking to let me click the picture

It sounds like you've already done almost all you can to diagnose the issue yourself. The only other obvious thing you might try is using your 18-250mm lens on your friend's camera. You can also rule ...
Michael C's user avatar
  • 175k
4 votes

Is there any difference in distance from Sensor to the lens (first glass) when we compare Sigma 24-70 2.8 and Sony 24-70 2.8?

The "closer to the sensor" advantage of which your friend speaks has a lot more to do with the distance between the sensor and the flange upon which the lens is attached, referred to as the ...
Michael C's user avatar
  • 175k

Only top scored, non community-wiki answers of a minimum length are eligible