What r compatible lenses for 18 mm - 200 mm range?

Hii there!

I have decided to buy Nikon D3100… And i want one lens which can serve all purposes ( eg prime, zoom, telephoto, wide angle ) so please tell me 18 mm - 200 mm lens will b gud or not and also compatible lens name…

if you want to add any other lens then ur suggestions r most welcome

thanxx

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Why can't I use a Canon speedlight off camera as a slave to a Nikon's optical trigger?

How does the speedlight know that Canon is not sending the trigger flash?

Is there some kind of radio signal from my Canon camera telling my Canon speedlight to go off? Then why can't it work without the flash? Because there is no radio trigger, you have to pay extra for that, and it only works for the 600ex rt.

So how does it know?

And how the heck does it read the TTL information?

side note: Girlfriend uses Nikon (has commander mode). Yongnuo speedlight works as a slave for both our cameras (doesn't have TTL).

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What size canvas can I use to print my pictures on?

I recently got a Nikon D3000 and was wondering how big of a canvas picture can I get printed that will still look good? Also is there a certain mode it should be on to produce the best pictures for prints?

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