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[Official] OCN Camera Thread - Page 258

post #2571 of 29551
Thread Starter 
Quote:
Originally Posted by spice003 View Post
has any one bought lenses of ebay before, because i got a 10% coupon and i cans save up $100. What you guys think? I'm thinking of picking this up
That's a great lens (but overpriced by Canon) and if you get it for under $500, you will have done well. It's a zoom that I've had my eye on.
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post #2572 of 29551
does the canon 2x extender work with this lens?
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post #2573 of 29551
Thread Starter 
Quote:
Originally Posted by spice003 View Post
does the canon 2x extender work with this lens?
Don't know, have to Google that one.
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post #2574 of 29551
yeah i was just reading, it works with any EF lens,but AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture. so does that mean i wont have auto focus?
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post #2575 of 29551
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Quote:
Originally Posted by spice003 View Post
yeah i was just reading, it works with any EF lens,but AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture. so does that mean i wont have auto focus?
Well, the 70-300mm can only do f/4, so if that's what it says I guess not. I think you'll find that 300mm on a crop sensor is a a lot of reach to begin with though, so you may not even need the TC converter.
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post #2576 of 29551
yeah, i'm just gonna get that lens for now, maybe sell it in a couple of years, and get an L series with like f2.8 or something. Thanx for the help though.
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post #2577 of 29551
That aperture need has something to do with the AF system used by the camera. I don't fully understand, nor have I fully read up on it. To Auto Focus, the camera opens the aperture up all the way and then closes it down to what yo asked for before it opens the shutter. It may need faster stops to get more light, or it may be there because focuses slowly with slower lenses, etc.
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post #2578 of 29551
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Quote:
Originally Posted by Mootsfox View Post
That aperture need has something to do with the AF system used by the camera. I don't fully understand, nor have I fully read up on it. To Auto Focus, the camera opens the aperture up all the way and then closes it down to what yo asked for before it opens the shutter. It may need faster stops to get more light, or it may be there because focuses slowly with slower lenses, etc.
Yeah, AF works by examining contrast, which requires extremes in light an dark, so it makes sense what you say.
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post #2579 of 29551
take look at this, lol. man that thing is huge.


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post #2580 of 29551
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Quote:
Originally Posted by spice003 View Post
take look at this, lol. man that thing is huge.


LOL, that's probably the 600mm or 800mm L lens, practically a friggin' telescope.
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