Does 7D really have custom shutter speeds ? - Page 2 - DVXuser.com -- The online community for filmmaking

Jester2138 · 11-04-2009, 07:31 AM

Yes but I believe that is accomplished by basically combining several frames into one. It's physically impossible to have the sensor exposed for separate frames 24 times per second, while each exposure lasts 1/10 of a second.

mhood · 11-04-2009, 07:36 AM

That makes perfect sense...Thanks! Anyone know how the "ghosts" were achieved? What would one do with Premiere CS4.1 to duplicate the effect? I guess it's motion blur to the extreme?

bwwd · 11-04-2009, 08:57 AM

They advertise that you can set any shutter speed from 30 to 4k so can you set 48 for example ?

Kholi · 11-04-2009, 09:22 AM

Quote:

Originally Posted by zcream

I am in Manual exposure mode.

I can only change the shutter from 1/30 to 1/45 to 1/60 with the dial.
Canon advertises that I can use ANY shutter speed.

What am I missing ?

I'd love to know how you got to a 1/45 in the first place. I've never seen it on this camera.

NoxNoctus · 11-04-2009, 09:51 AM

Those thinking that "Setting shutter speed between 30 to 4K" means everything from 1/31, 1/32, to 1/3998, 1/3999 or something need to realize shutter speed and f/stop correlation. Every time you move a stop brighter the shutter speed correlates and moves a stop down as well. There's no real in-betweeners on a set scale.

Martti Ekstrand · 11-04-2009, 09:58 AM

Quote:

Originally Posted by mhood

I recall a very nice GH1 (IIRC) piece shot at night in a graveyard. It involved "ghosty" very blurred movement of characters that really worked in the piece. IIRC, a very slow shutter speed (way below the frame rate) was how the shooter accomplished the effect.

That was me. My second GH1 film, "A Kindling Light". You find it on Vimeo through my sig link below.

Quote:

Originally Posted by Jester2138

Yes but I believe that is accomplished by basically combining several frames into one. It's physically impossible to have the sensor exposed for separate frames 24 times per second, while each exposure lasts 1/10 of a second.

Wrong. It was filmed at 1/2 second shutter speed.

Quote:

Originally Posted by mhood

That makes perfect sense...Thanks! Anyone know how the "ghosts" were achieved? What would one do with Premiere CS4.1 to duplicate the effect? I guess it's motion blur to the extreme?

I do know but I don't want to high-jack this thread so you can check info about how I did it and ask more here:

http://www.dvxuser.com/V6/showthread.php?t=177342

mhood · 11-04-2009, 10:53 AM

One more (what seems to be an OT ? to me)....So the GH1 does allow 1/2s shutter speeds in 720 mode and the 7D limits all shutter speeds to no lower than FPS? Too bad...it was a magnificent effect and you used it perfectly. Incredible concept, understanding and execution.

PSA1 · 11-04-2009, 10:57 AM

Video camera like my XHA1 also allow lower shutter speed than frame rate, and it double light sensitivity from 30th to 15th and on down to I believe 1/4th

zcream · 11-04-2009, 04:21 PM

I had my CF1 : Exposure setting to 1/2 stop increments. So it moves 30, 45, 60 etc.

I changed it to 1/3 stop increments and now I get 30, 40, 50 etc.

Quote:

Originally Posted by Kholi

I'd love to know how you got to a 1/45 in the first place. I've never seen it on this camera.

zephyrize · 11-04-2009, 05:48 PM

If I understood your question correctly,
you're asking why you can not dial any number for the shutter speed, ex.: 1/30, 1/29, 1/28,..

Shutter speeds increase or decrease by FRACTIONS, values such as 1/7 or 1/22 do not exist in any camera.
it's like f-numbers, there are f2, f2.8, f3.2, but no such thing as f2.1 or f3.0 ...

11-04-2009, 07:36 AM	#12
mhood Senior Member Join Date: Sep 2008 Posts: 948	That makes perfect sense...Thanks! Anyone know how the "ghosts" were achieved? What would one do with Premiere CS4.1 to duplicate the effect? I guess it's motion blur to the extreme? __________________ "All i need in a camera is out there, just not in the same body at the same time. :-) " mattsand

11-04-2009, 10:53 AM	#17
mhood Senior Member Join Date: Sep 2008 Posts: 948	One more (what seems to be an OT ? to me)....So the GH1 does allow 1/2s shutter speeds in 720 mode and the 7D limits all shutter speeds to no lower than FPS? Too bad...it was a magnificent effect and you used it perfectly. Incredible concept, understanding and execution. __________________ "All i need in a camera is out there, just not in the same body at the same time. :-) " mattsand

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11-04-2009, 07:31 AM	#11
Jester2138 Senior Member Join Date: May 2009 Location: New Orleans, LA Posts: 338	Yes but I believe that is accomplished by basically combining several frames into one. It's physically impossible to have the sensor exposed for separate frames 24 times per second, while each exposure lasts 1/10 of a second.

11-04-2009, 08:57 AM	#13
bwwd Senior Member Join Date: Dec 2008 Posts: 807	They advertise that you can set any shutter speed from 30 to 4k so can you set 48 for example ?

11-04-2009, 09:51 AM	#15
NoxNoctus Senior Member Join Date: Jul 2009 Location: Raleigh, NC Posts: 296	Those thinking that "Setting shutter speed between 30 to 4K" means everything from 1/31, 1/32, to 1/3998, 1/3999 or something need to realize shutter speed and f/stop correlation. Every time you move a stop brighter the shutter speed correlates and moves a stop down as well. There's no real in-betweeners on a set scale.

11-04-2009, 10:57 AM	#18
PSA1 Senior Member Join Date: Apr 2009 Posts: 109	Video camera like my XHA1 also allow lower shutter speed than frame rate, and it double light sensitivity from 30th to 15th and on down to I believe 1/4th

11-04-2009, 05:48 PM	#20
zephyrize Junior Member Join Date: Oct 2009 Location: Montreal - Canada Posts: 19	If I understood your question correctly, you're asking why you can not dial any number for the shutter speed, ex.: 1/30, 1/29, 1/28,.. Shutter speeds increase or decrease by FRACTIONS, values such as 1/7 or 1/22 do not exist in any camera. it's like f-numbers, there are f2, f2.8, f3.2, but no such thing as f2.1 or f3.0 ...