Question

 What is called optical centre of a lense?

Answer optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.
http://wiki.answers.com/Q/What_is_called_optical_centre_of_a_lense

Top Q&A For: What is called optical centre of a lense

Canon slr 500 D with 18-200 zoom lense your lense is stuck and after pushing the button it is not coming out what is the problem?

Have you tried rotating it?You are supposed to rotate it with the lens release button pushed to take it out.If its still stuck, you are better off taking it to a professional repair shop, or callin... Read More »
http://wiki.answers.com/Q/Canon_slr_500_D_with_18-200_zoom_lense_your_lense_is_stuck_an...

What kind of lense attachments can I get for my Fuji finepix S5600 it has a 55mm lense. ?

Wide angle lenses which screw on like filters are available,they often come in a standard size thread called a T-mount,which will need a 55mm to T-mount adapter so it will fit on the front of your... Read More »
http://answers.yahoo.com//question/index?qid=20080916100052AAo0SMd

Do you really need the standard lense that comes with the canon EOS100D18-55mm Or can you just buy a better lense maybe 70-300mm?

What happens if you use a centre positive plug on something that asks for centre negative?

There's a good chance you'd fry whatever you plugged it into. At best, it just wouldn't work.
http://answers.yahoo.com/question/index?qid=20130413123713AAtCQvF


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