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Questions about specific terms used within photography

learn more… | top users | synonyms (1)

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1answer
536 views

What does “OS” mean on a Sigma lens? [duplicate]

I want to buy a Sigma 180mm F/2.8 EX DG Macro OS HSM Sigma. What does EX mean? What does DG mean? What does OS mean? What does HSM mean?
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votes
1answer
70 views

about luminance and illuminance: what is the difference? [duplicate]

First of all, let me say that english is not my first language, so please excuse any mistakes that you could meet from here on out. I read several articles and explanations about luminance and ...
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votes
1answer
1k views

What is Canon's Super Spectra Coating?

In the Canon EF 25-105mm f/4 L USM IS lens specs, it says that the lens coating is "Super Spectra Coating". What is the Super Spectra Coating and how it differs from other types of coating?
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votes
2answers
81 views

How much zoom does a lens need to have before we call it a superzoom lens?

I've read that superzoom lenses have poor image quality, but how much zoom does a lens need to have before we call it a superzoom lens? 3x is certainly not a superzoom, while 10x probably is. ...
-1
votes
1answer
65 views

How are “Tele Photography” and “Candid Photography” different for a wedding?

For wedding functions, are "tele photography" and "candid photography" the same? If not, what are all the similarities and dissimilarities?
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votes
1answer
55 views

ACR terminology

Can someone recommend a guide (or a sensical glossary) that would pull together all the terminology used in the Adobe Camera Raw, preferably by tab (Basic, Tone Curve, Detail, etc.), with all the ...
-1
votes
0answers
28 views

What is Exposure value [duplicate]

can you guys help me with understanding the basics about what is Exposure value and how to use that for better photography?