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0
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2answers
8k views

What do the lens parameter abbreviations mean? [duplicate]

Possible Duplicate: What do all those cryptic number and letter codes in a lens name mean? Canon EF 50mm f/1.8 II What does EF, II mean? Sigma 10mm/F2.8 EX DC Fisheye HSM compatibil ...
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1answer
1k views

whats with the nikor lens naming using the letters D + G? [duplicate]

Possible Duplicate: What do all those cryptic number and letter codes in a lens name mean? Nikon 50mm f/1.8D Nikon 35mm f/1.8G what does the D and G distinction mean on these lenses and ...
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votes
1answer
550 views

Nikon lens naming [duplicate]

Possible Duplicate: What does all those parts in a lens name mean? I'm thinking about buying myself a new lens for my Nikon and I have a question about the naming conventions Nikon uses for ...
0
votes
1answer
2k 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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2answers
1k views

What does f/4.5-5.6G stand for on a Nikon Lens? [duplicate]

Can you please explain me what is 4.5 - 5.6G in a lense description.And how it is different from other generation of like 3.5G or 6.5. "Nikon AF-S DX NIKKOR 55 - 300 mm f/4.5-5.6G ED VR Lens"
1
vote
1answer
200 views

How to read lens specs [duplicate]

Can someone help me decipher the specs of a camera lens. Purely for example, I see a lens being advertised as: AF Nikkor 24-50mm 1:3.3-4.5 Wide Angle Zoom What is AF? What exactly does 24-50mm ...
0
votes
0answers
120 views

Nikon Lens Types. What is AF, AF-S, D, G mean? [duplicate]

What do these lens types denote. I have seen similar questions, but they don't have the answer I'm looking for. I have a Nikon D5200. It does not have a focus motor in the camera, so it relies on the ...
0
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1answer
77 views

What is the difference between the AF-S 50mm f1.8G and the AF 50mm 1.8D? [duplicate]

I am curious to know what is the difference between an AF-S and AF lens. What makes AF-S more costly than AF? Is there any difference in image quality ?
37
votes
3answers
280k views

What does STM mean on a Canon lens?

The Canon EF 40mm f/2.8 has a designation of STM on the lens. What does this mean? What are the advantages of having it and does it replace an older technology? We have a terminology thread that ...
13
votes
4answers
41k views

What is USM, and what are its pros and cons?

My Canon lenses have the designation USM on them, which I assume is for the same reason that they say "Ultrasonic". What does this mean, and why or why do I not want it?
21
votes
3answers
29k views

What is the difference between Canon “L” lenses and non-L lenses?

The Canon L lenses are much more expensive and presumably much better quality than non-L lenses. What makes an "L" lens? How much better are they over a similar length/speed "ordinary" canon lenses?
18
votes
2answers
11k views

What is T-number / T-stop?

Usually, when discussing aperture of a lens, F-stop and F-number are used for quantifying. But some photographers, and especially videographers, also mention T-stop. The concept and numbering used ...
24
votes
1answer
7k views

How do soft focus or defocus control rings work?

Lenses like this one from Nikon have a "defocus control" feature which allows you to Control the degree of spherical aberration in background or foreground elements for more creative control. ...
12
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3answers
1k views

Decrypting Canon's Nomenclature Of Cameras

I'm an avid Canon user and I haven't used any cam other than Canon's ever. Right now, I'm having a 550D with 70-200 to compliment it. My question today is, Canon has a very wide range of camera ...
7
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3answers
8k views

What do the AF-A, AF-C, and AF-S autofocus settings mean?

My camera has these settings for autofocus, and I don't know what they mean. I suspect "A" is "Auto", and "C" is "continuous", but I have no idea what "S" is.

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