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October 18, 2019, 01:57:08 PM


Author Topic: Is the 18-55mm lens needed if only using T2i for video?  (Read 11610 times)

Offline NathanHead

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Re: Is the 18-55mm lens needed if only using T2i for video?
« Reply #15 on: April 20, 2013, 05:37:09 PM »
I just found this topic and AndyCivil's video and I found it quite helpful.

I just wanted to ask Andy how far away the cat was during this film?
I have the same kit lens and I've noticed that on video mode it won't focus on anything too far away and its starting to make me wonder that a) there's something wrong with my lens or b) I have some autofocus setting wrong or c) I'm a total n00b and I'm only embarrassing myself by posting this

haha


Offline AndyCivil

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Re: Is the 18-55mm lens needed if only using T2i for video?
« Reply #16 on: April 20, 2013, 06:42:00 PM »
Nico was three metres away from the camera.

The most obvious "gotcha" for new videographers is that the camera doesn't focus unless you tell it to. Half pressing the shutter does the trick. In video mode, you're automatically using "contrast-based" focus where it maximises the detail inside the focus box (which you can move around the screen to indicate your subject).

When you half-press the shutter, does the outline focus box go green after the searching process?

The T2i is not like a camcorder, by the way, it will not follow things and refocus as you take your movie.

Hope this helps.

Offline NathanHead

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Re: Is the 18-55mm lens needed if only using T2i for video?
« Reply #17 on: April 21, 2013, 02:54:24 AM »
Thanks for replying

But maybe I wasn't making my first post clear enough. I know how to focus.

Both with the shutter in AF and with turning the lens dial in M. I know.

I know about not moving once in focus.
My camera will not focus on anything further away, than say two or three feet, when recording video using the 18-55mm

Offline AndyCivil

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Re: Is the 18-55mm lens needed if only using T2i for video?
« Reply #18 on: April 21, 2013, 08:36:10 AM »
When you half-press the shutter, does the outline focus box go green after the searching process?
a) for an object closer than two feet
b) for an object further away, that you claim it won't focus on

Will it not even focus to infinity if you do it in manual?

You say "in video mode" but the focusing is the same principle whether in photo or video, so it's implausible that video mode could make any difference. What if you focus in photo mode, and then turn the dial to video - is it somehow now magically out of focus?

Video mode forces the camera to use "contrast maximisation" type focusing. Is this the problem? Can you, in photo mode, try focusing experiments comparing quick focusing (viewfinder) to live view focusing, and see if you can notice any error?

I've asked lots of questions... the more you can answer the easier it is to diagnose :-)

Thinking about the error (failure to focus further than 2 ~ 3 feet) and what could cause it, I would say adding some distance between the camera and the lens. In fact, this is what an "extension tube" does - it brings the focus range closer to the camera so that you can take macro pictures. I apologise if this seems obvious, but I have to ask: do you have an extension tube fitted to your lens?


Offline NathanHead

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Re: Is the 18-55mm lens needed if only using T2i for video?
« Reply #19 on: April 21, 2013, 02:34:22 PM »
hello! I've semi-sorta found a solution.

It will focus in manual when on infinity so I can only assume that I need to explore the Auto settings more.

cheers for the responses everyone

Offline ctyhntr

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Re: Is the 18-55mm lens needed if only using T2i for video?
« Reply #20 on: April 26, 2013, 11:52:27 AM »
I agree, the kit lenses have an undeserved reputation.   I think adequate lighting is the key, as each lens have a sweet spot of aperture range which will perform its best. 

http://warrenjrphotography.com/articles/blogs/why-the-kit-lenses-are-more-than-good-enough-for-most-photographers/

Since we're replying to a ghost, I'll just say that I find the 50mm to be pretty tight for indoor work.  I too think the 18-55 is much-maligned for little reason.