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How do you zoom in/out with out losing focus with t2i?

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[J_Gasper]
Posts: 2983 - Karma: 1,594
^^^^
Nov 30 2010 8:50PM
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eheath
Posts: 61107 - Karma: 118,279
Well, i'm guessing you're posted up, standing still, hopefully on a tripod. Zoom in where you want to zoom in, focus, and then zoom out and in most cases as long as your subject is in the same focal plane as where you zoomed into, it will be in focus when you zoom out. Otherwise, you'd have to pull focus while you zoom if you're trying to zoom in on something in a different focal plane.
Nov 30 2010 8:52PM
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family_vacation
Posts: 6200 - Karma: 7,841
It will be a lot easier with a narrow aperture.
Nov 30 2010 9:14PM
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a_pla5tic_bag
Posts: 9210 - Karma: 5,357
What they said, plus as you zoom in you have a shallower area that's in focus.
Nov 30 2010 9:17PM
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1337
Posts: 31038 - Karma: 29,003
f stop greater than or equal to 8
Nov 30 2010 9:18PM
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eheath
Posts: 61107 - Karma: 118,279
Yeah but you'll lose the shallow DOF that everyone loves(overrated) after f8-11
Nov 30 2010 9:18PM
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a_pla5tic_bag
Posts: 9210 - Karma: 5,357
mhmm. plus then you'll potentially be shooting at a lower shutter with a zoom lens which is never fun if it's to slow.
Nov 30 2010 9:29PM
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.jr
Posts: 5313 - Karma: 356
after f/4-5.6*

So what was that Redrock for big guy? lol.
Nov 30 2010 9:40PM
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MADDECENT
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Nov 30 2010 10:00PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
i know some of you have helped me in the past, would the sigma 18- 50 2.8 be narrow enough aperture?
Nov 30 2010 10:00PM
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50in07
Posts: 3070 - Karma: 1,471
yes. As mentioned before set your f-stop around 8ish
Nov 30 2010 10:10PM
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[J_Gasper]
Posts: 2983 - Karma: 1,594
ok thanks
Nov 30 2010 10:19PM
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eheath
Posts: 61107 - Karma: 118,279
Well 35mm adapters add a very nice film look and i like being able to use different lenses for different looks. I mean, obviously i want nice shallow DOF for things but i mean since the t2i and 7d kids only care about shallow DOF.
Nov 30 2010 11:10PM
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Freshbakedbread
Posts: 949 - Karma: 483
I'd like to have an f 1.8 accurate auto focus... would look so killer with impossible looking follow shots, and camera moves
Nov 30 2010 11:30PM
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t_rob
Posts: 6433 - Karma: 11,458
except when you're getting below f/4 you start losing total focus of a subject that big.
Nov 30 2010 11:36PM
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WillStart
Posts: 3955 - Karma: 3,192
nah man, ever since 35mm adapters came out one of the main selling points has been shallow DOF, the manufacturers always made a point of mentioning it in the product description. it only seems like kids are going crazy now because it's affordable.

to OP, everybody else pretty much covered it. but one of the downsides to DSLR video is that zooming is really difficult and just doesn't work that well. Pretty jerky on even some really nice lenses
Nov 30 2010 11:55PM
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eheath
Posts: 61107 - Karma: 118,279
I meant more the kids on NS, obviously shallow DOF has been desired forever.
Dec 1 2010 2:19AM
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