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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 why does it matter?

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    \$\begingroup\$ Duplicate: photo.stackexchange.com/questions/496/… \$\endgroup\$
    – mattdm
    Dec 27, 2010 at 19:21
  • \$\begingroup\$ This is definitely a duplicate of the question matt noted. I'm closing as a duplicate. \$\endgroup\$
    – jrista
    Dec 28, 2010 at 1:56

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G means "gelded" which means there is no aperture ring and so the aperture can only be adjusted on the camera itself. D means "distance information" and helps the camera to know what it is focusing on based on distance.

http://www.ehow.com/about_5385361_nikon-vs-lenses.html

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    \$\begingroup\$ I highly doubt that Nikon chose to label their lenses with a pejorative term like that. More likely that's an after-the-fact joke explanation made by a clever but unhappy customer. \$\endgroup\$
    – mattdm
    Dec 27, 2010 at 19:13
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    \$\begingroup\$ In this context the G(elded) lens is also a D. See kenrockwell.com/nikon/nikortek.htm#g ... Ken also explains the other limitations of G. \$\endgroup\$
    – Leonidas
    Dec 27, 2010 at 19:18
  • \$\begingroup\$ While I tend to agree with Matt about the naming, I do think it's an apt description for it. \$\endgroup\$
    – Joanne C
    Dec 28, 2010 at 1:09

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