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Linked Questions

0
votes
2answers
6k 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 ...
1
vote
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 ...
0
votes
1answer
505 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
422 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?
1
vote
1answer
129 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 ...
-1
votes
2answers
201 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"
0
votes
0answers
79 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 ...
32
votes
3answers
219k 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 ...
10
votes
4answers
27k 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?
17
votes
2answers
8k 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 ...
20
votes
3answers
21k 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?
24
votes
1answer
5k 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
votes
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
votes
3answers
5k 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.
11
votes
4answers
2k views

Lens “family” names - what do they mean and should I care?

Some lens manufacturers have special names for their lens designs/families. Just to name a few: Leica - Summar/Summarit/Summilux, Elmar/Elmarit, Noctilux Carl Zeiss - Planar, Tessar, Sonnar, ...

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