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Linked Questions

0
votes
2answers
4k 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
454 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 ...
1
vote
1answer
81 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 ...
26
votes
3answers
122k 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 ...
17
votes
3answers
13k 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?
8
votes
3answers
13k 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?
23
votes
1answer
4k 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
918 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
3k 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.
10
votes
4answers
1k 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, ...
8
votes
3answers
707 views

Cameras using mirrors instead of lenses?

In astronomy, telescopes are most commonly built with mirrors, but there are refractors using lenses. All cameras I know of for Earthly purposes — portraits, landscapes, etc. — use only lenses, not ...
7
votes
1answer
4k views

What are the AF-A, AF-C and AF-S autofocus modes, and how and when should I use each one?

I have seen these autofocus options on all my Nikon DSLR cameras (D50, D80, D90) but I have never really used them. There is the AF button on top. What are AF-A, AF-C, and AF-S ? How do I use ...
7
votes
3answers
610 views

What are ED elements?

I find that some lenses are indicated with the letters "ED", referring to some special type of lens element. What are ED elements, and what advantages do they bring? Note that this question isn't ...
4
votes
4answers
6k views

What is the DT series of Sony lenses?

Among the Sony lenses there are some types with a DT abbreviation and some are without it. Those having DT called DT-series. What does DT mean? What is the difference between DT-series lenses and ...

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