Canon 550D Full HD video

shaocaholica said:
Maybe I'm the one confused here but the three lenses mentioned by J Davis all have full aperture control down to 1/3 stop increments on any Canon body even though they don't have a physical aperture ring.

17-55/2.8, 11-16 and 24-105L
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Hey thats good news! I should be able to test it on my 7D with a 17-55/2.8 rental in about a week.
 
J Davis said:
FYI - I've been shooting solidly with canon FD's, AIS and various nikon F mount lenses since last summer on the GH1 and since last fall on the 7D. When it comes to EOS lenses I rent. Both cameras got set to Manual as soon as I got them and they stayed that way so forgive me if I am ignorant of any camera functionality like exposure compensation etc. I still haven't read my 7D manual yet! (too lazy)
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I'm trying to figure out why you think these Canon lenses (17-55/2.8, 11-16 and 24-105L) are less capable than a "manual lens".
 
shaocaholica said:
I'm trying to figure out why you think these Canon lenses (17-55/2.8, 11-16 and 24-105L) are less capable than a "manual lens".
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Just to put that in context, it was referring to their use on a t2i in the event that there is no way to adjust exposure in between stops other than moving away from 180 degree shutter. Until one of gets a t2i in our hands to test there is no way to be sure on ISO 1/3rd steps or that it can control these lenses for in between fstop apertures. (Manual lenses have the ring that can be set to in between fstops). Hope I have explained it better now.
 
J Davis said:
Just to put that in context, it was referring to their use on a t2i in the event that there is no way to adjust exposure in between stops other than moving away from 180 degree shutter. Until one of gets a t2i in our hands to test there is no way to be sure on ISO 1/3rd steps or that it can control these lenses for in between fstop apertures. (Manual lenses have the ring that can be set to in between fstops). Hope I have explained it better now.
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I gotcha now. I'm 100% certain you'll be able to set 1/3 stop aperture values on those lenses via the camera on the T2i. Not having that kind of control is unheard of for a DSLR and if even rumored there would be a huge uproar in the stills community.
 
If so I will very likely flip my 7D for the t2i. Still to early to be sure. I'll await reviews from phil bloom and other early testers. There still could be some gotya's with the codec as it is a single chip cam.
 
I gotcha now. I'm 100% certain you'll be able to set 1/3 stop aperture values on those lenses via the camera on the T2i. Not having that kind of control is unheard of for a DSLR and if even rumored there would be a huge uproar in the stills community.
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t1i doesnt have the 1/3 increments.. its is possible t2i doesnt.
 
SteB said:
The Dpreview preview of the T2i/550D shows a menu for setting exposure level increments to either 1/2 stop or a 1/3 stop. I'm not sure if this alters the aperture setting increments.
http://www.dpreview.com/previews/canoneos550d/page12.asp
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That setting is for for aperture, shutter and exposure compensation. So, yes, it does indeed affect the aperture. Having 1/3 and 1/2 stop adjustments for exposure settings is pretty standard on DSLRs even the entry level ones. This shouldn't be seen as anything special or out of place.
 
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Hi Guys,

I am just getting into the DSLR video shooting as am writing this, and I'm trying to learn as much about it as possible. One thing that kept me wondering was why is it that important to have 180 degree shutter. Well how I understand it is that it gives it a better film look? Am I understanding this correctly?

Also, I don't understand the connection between 1/3 fstop ISO and the 180 degree shutter. How would the ISO change the shutter? I though if you are recording 24p then if you set it to 1/48 shutter, you should be getting 180 degree shutter. Why would ISO interfere with this if it is 1 fstop instead of 1/3 fstop? Could someone please explain this to me because at the moment I am not fully catching on how this all relates. Thanks

Peter
 
peti1212 said:
Hi Guys,

I am just getting into the DSLR video shooting as am writing this, and I'm trying to learn as much about it as possible. One thing that kept me wondering was why is it that important to have 180 degree shutter. Well how I understand it is that it gives it a better film look? Am I understanding this correctly?

Also, I don't understand the connection between 1/3 fstop ISO and the 180 degree shutter. How would the ISO change the shutter? I though if you are recording 24p then if you set it to 1/48 shutter, you should be getting 180 degree shutter. Why would ISO interfere with this if it is 1 fstop instead of 1/3 fstop? Could someone please explain this to me because at the moment I am not fully catching on how this all relates. Thanks

Peter
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Hi Peter, welcome to dvxuser.

In order to correctly expose a still image we manipulate three things.
• ISO
• shutter speed
• aperture
When shooting video you don't mess with the shutter so you only have two things
• ISO
• aperture
So having 1/3rd stop adjustments on either ISO or aperture or both is important. The ISO brackets on the t2i are at 1 stop (200, 400, 800, 1600, 3200) with no in betweens confirmed. Thats what the specs say and we have been debating this point for a few pages now. The other way to do it is with aperture. 1/3rd stop adjustments are easy with a manual lens but with an EOS lens where aperture is controlled from the camera is becomes another story. Hence - our discussion.

edit: there are other tricks like ND filters etc but the main ones are listed above
 
Oh ok, so what you are trying to say is that with such settings, to properly expose the shots you would need more options than just those, because those are big jumps in between, correct? What I was thinking when I read this and before I read your ND filter comment was Fader ND filters. In this situation you could get a nice Fader ND filter which would allow you to easily and well expose the image. Am I understanding this right? Thanks.
 
Some more info. I just played with a rebel t1i (not t2i) and it had an EOS lens on it. In manual mode I had 1/3rd stop aperture control of an EOS lens.
 
J Davis said:
Some more info. I just played with a rebel t1i (not t2i) and it had an EOS lens on it. In manual mode I had 1/3rd stop aperture control of an EOS lens.
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This is what was surprising to me. All DSLRs and even before digital had 1/3 stop aperture adjustments. Its so ubiquitous that I didn't expect people to doubt it.
 
Hmm, im really confused and a little frustrated.

at this point, what does the 7D offer that the T2i does not? Both in video and photo realms?
 
PaPa said:
Hmm, im really confused and a little frustrated.

at this point, what does the 7D offer that the T2i does not? Both in video and photo realms?
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Photo realms they are a world apart, 7D kills the t2i

Video world remains to be seen but so far they look pretty similar.
Its too early to tell. There might be some gotcha's with the codec, artefacts,
also I don't know how SDHC data transfer rates compare to 7D CF card, maybe someone else can help out with that one.
 
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