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41 votes
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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: ...
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27 votes
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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 ...
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25 votes

Why are photos taken with my old lenses all out of focus on my new Nikon D5300 body?

Your old D80 had a focus motor built into the body that connects to a mechanical coupling on Nikkor AF lenses to move the focus elements in the lens. Your D5300 does not have a focus motor in the body....
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22 votes

is there a real difference between "digital" and "film" lenses?

I think you are putting too much emphasis on the "digital" part of the lens' DG designation. It seems to be more to differentiate them from "digital" lenses that are APS-C only. Sigma calls their ...
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18 votes
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is there a real difference between "digital" and "film" lenses?

Yes, lenses designed for digital sensors have several differences from their older film based camera lens counterparts. One of the primary differences is that digital sensors are more reflective than ...
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15 votes
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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 ...
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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.
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9 votes

Which mount is this Sigma lens for?

I think you've got a Minolta A-mount lens. Compare to this photo (image borrowed from here): Minolta and Konica merged at some point and were subsequently acquired by Sony, and this mount is ...
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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 ...
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8 votes
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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' ...
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7 votes
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How important is it to buy the Sigma USB dock?

You don't really need the dock until you need to install a firmware update, or until you decide you want to fine tune the lens. My suggestion: don't buy the dock until either of those situations arise....
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7 votes
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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 ...
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7 votes
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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 ...
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6 votes

is there a real difference between "digital" and "film" lenses?

Some 'film' lenses designed for 35mm rangefinder cameras have a rear element which lies quite close to the plane of the film or sensor (mostly wide-angle lenses). These work fine for film, but when ...
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6 votes

is there a real difference between "digital" and "film" lenses?

There is one significant difference between film and digital sensor for lens optics - digital sensors have a bit of glass and some filters in front of them. The lensrental.com blog has a pretty ...
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6 votes
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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 ...
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  • 168k
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'...
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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 ...
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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 ...
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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 ...
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  • 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 ...
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  • 9,455
5 votes

Why are my photos taken with the Sigma 18-50mm f/2.8 coming out blurred?

This photo is severely back focused. Areas about 15-20 feet behind the main subjects are in focus. Some things to keep in mind: When using wider apertures, especially combined with larger sensors, ...
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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 ...
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5 votes
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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 > Image area) is set to "On", and if somehow your camera is interpreting the lens ...
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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 Sigma 150-600mm f5-6.3 Contemporary DG OS HSM would no longer work with phase-detection-AF (or, to ...
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  • 6,307
5 votes
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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 ...
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  • 168k
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 ...
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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 ...
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  • 168k
4 votes
Accepted

Why does my lens refocus when the f-stop is changed?

does the focus change from one f-stop to the next Depth of field changes when you change the aperture, so the camera is probably adjusting to ensure that the object at the selected AF point remains ...
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