Z7 dof? at DVinfo.net

Michael Rees · February 22nd, 2009, 02:30 PM

Can the Z7 achieve a good DOF with the proper settings. I have heard that it doesent do to well with that and focuses on ENG type shootings more. Anyone have any other info on this, I dont know if what I heard was true but if you set the focus on the lens to servo i think it will do fine. Test clips please!

Tom Hardwick · February 22nd, 2009, 03:07 PM

A good depth of field implies a deep dof - is this what you're after? In which case you're in luck - any camera that uses tiny 1"/3 chips also comes with very short focal length lenses, meaning it takes concentration to get any sort of differential focus at all.

tom.

Michael Rees · February 22nd, 2009, 08:11 PM

Actually, by "good" DOF I meant a short DOF with a short focus range. Somewhat resembling a 35mm adapter with proper settings. But ,okay...

Greg Laves · February 22nd, 2009, 11:38 PM

I have been able to achieve a really good "shallow" DOF look with the Z7 in a talking head shot. It required more space than my 2/3" Betacam would need to get the same look. But it can be done. The subject was about 12 feet in front of the background and the camera was maybe 15 feet from the subject. I used negative gain (-6db) to help get the aperature wide open. Since the camera was not really close to the subject, I could also use a little telephoto on the lens to help soften the background, as well.

Tom Hardwick · February 23rd, 2009, 02:02 AM

Michael - the Z7 - of all the 1"/3 chipped camcorders - is the best at obtaining differential focus in your shots, and that's because the lens is so fast (f/2) at full telephoto.

So the way to get your talent standing out sharply from soft foregrounds and backgrounds is to

1) Use maximum aperture (use the NDs and raise the shutter speed if necessary)

2) have the subject as close to your camera as possible

3) Have the background as far away as possible.

4) Use full telephoto, A telephoto converter is good too as it increases the focal length while not decreasing the max aperture (as ramping zooms all do).

tom.

Zach Love · February 23rd, 2009, 04:07 PM

Z7 will have the same DOF as: Sony PD170, S270, Z1, Z5... Canon XL1, GL1, XH-L1, XH-A1... JVC HD110, HD200... Panasonic DVX100, HVX200, HPX170... ... ... ...

Any of these 1/3" cameras will have just about the same DOF. Cameras like the HX-A1 & Z5 have 20x lenses, compared to the Z7's stock 12x lens. I purchased a MTF adapter & now have a range of almost 100x zoom by being able to change lenses.

Just remember that DOF is determined by ONLY two factors:
1. Lens (Length)
2. Aperture (F-stop)

A 50mm lens w/ an aperture of 2.0 will have the same DOF on a 35mm film camera as it does on a 1/3" video camera. The real difference is the FOV (Field of View).

If you want the same DOF & FOV of a 35mm film camera on a Z7, buy a Letus or Redrock.

If you don't want to use an adapter, then get a camera w/ larger chips like the 1/2" EX1 or EX3, or any of the costly 2/3" shoulder mount cameras (but those are $20k+++).

Tom Hardwick · February 24th, 2009, 03:10 AM

Quote:

Originally Posted by Zach Love

Z7 will have the same DOF as: Sony PD170, S270, Z1, Z5... Canon XL1, GL1, XH-L1,JVC HD110, HD200... Panasonic DVX100

You're quite correct in that the Z7 will 'have the same dof' as those other cameras mentioned but only at the same focal lengths and apertures.

The good thing about the Z7 is that it opens to f/2 at 54 mm focal length. The Z1 can only manage f/2.8, the DVX100 can't even get there - it peters out at 45 mm and f/2.8.

So in the real world the Z7 opens up better shallow dof possibilities than the other fixed lensed cameras, for an equivalent fov.

tom.

Greg Laves · February 24th, 2009, 04:40 PM

Quote:

Originally Posted by Zach Love

Z7 will have the same DOF as: Sony PD170, S270, Z1, Z5... Canon XL1, GL1, XH-L1, XH-A1... JVC HD110, HD200... Panasonic DVX100, HVX200, HPX170... ... ... ...

If you want the same DOF & FOV of a 35mm film camera on a Z7, buy a Letus or Redrock.

If you don't want to use an adapter, then get a camera w/ larger chips like the 1/2" EX1 or EX3, or any of the costly 2/3" shoulder mount cameras (but those are $20k+++).

Or get a broadcast lens for your Z7. No f stop ramping. F1.4 capability. And much cheaper than buying an EX3 or larger camcorder.

Jason LeFrense · March 11th, 2009, 08:05 PM

I fought with the same problems and I have tried everything from lighting to shutter speeds and still could get the effect I was looking for. So I purchased the Brevis 35mm adapter and it makes a world of a difference. I'm extremely happy with the results. I would imagine the other 35mm adapters will work just as good.

February 22nd, 2009, 02:30 PM	#1
Michael Rees Regular Crew Join Date: Jan 2009 Location: United States Posts: 50	Z7 dof? Can the Z7 achieve a good DOF with the proper settings. I have heard that it doesent do to well with that and focuses on ENG type shootings more. Anyone have any other info on this, I dont know if what I heard was true but if you set the focus on the lens to servo i think it will do fine. Test clips please!

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February 22nd, 2009, 03:07 PM	#2
Tom Hardwick Inner Circle Join Date: Mar 2003 Location: Billericay, England UK Posts: 4,711	A good depth of field implies a deep dof - is this what you're after? In which case you're in luck - any camera that uses tiny 1"/3 chips also comes with very short focal length lenses, meaning it takes concentration to get any sort of differential focus at all. tom.

February 22nd, 2009, 08:11 PM	#3
Michael Rees Regular Crew Join Date: Jan 2009 Location: United States Posts: 50	Actually, by "good" DOF I meant a short DOF with a short focus range. Somewhat resembling a 35mm adapter with proper settings. But ,okay...

February 22nd, 2009, 11:38 PM	#4
Greg Laves Major Player Join Date: Nov 2007 Location: Corpus Christi, TX Posts: 640	I have been able to achieve a really good "shallow" DOF look with the Z7 in a talking head shot. It required more space than my 2/3" Betacam would need to get the same look. But it can be done. The subject was about 12 feet in front of the background and the camera was maybe 15 feet from the subject. I used negative gain (-6db) to help get the aperature wide open. Since the camera was not really close to the subject, I could also use a little telephoto on the lens to help soften the background, as well.

February 23rd, 2009, 02:02 AM	#5
Tom Hardwick Inner Circle Join Date: Mar 2003 Location: Billericay, England UK Posts: 4,711	Michael - the Z7 - of all the 1"/3 chipped camcorders - is the best at obtaining differential focus in your shots, and that's because the lens is so fast (f/2) at full telephoto. So the way to get your talent standing out sharply from soft foregrounds and backgrounds is to 1) Use maximum aperture (use the NDs and raise the shutter speed if necessary) 2) have the subject as close to your camera as possible 3) Have the background as far away as possible. 4) Use full telephoto, A telephoto converter is good too as it increases the focal length while not decreasing the max aperture (as ramping zooms all do). tom.

February 23rd, 2009, 04:07 PM	#6
Zach Love Major Player Join Date: Jul 2006 Location: Chicago, IL Posts: 944	Z7 will have the same DOF as: Sony PD170, S270, Z1, Z5... Canon XL1, GL1, XH-L1, XH-A1... JVC HD110, HD200... Panasonic DVX100, HVX200, HPX170... ... ... ... Any of these 1/3" cameras will have just about the same DOF. Cameras like the HX-A1 & Z5 have 20x lenses, compared to the Z7's stock 12x lens. I purchased a MTF adapter & now have a range of almost 100x zoom by being able to change lenses. Just remember that DOF is determined by ONLY two factors: 1. Lens (Length) 2. Aperture (F-stop) A 50mm lens w/ an aperture of 2.0 will have the same DOF on a 35mm film camera as it does on a 1/3" video camera. The real difference is the FOV (Field of View). If you want the same DOF & FOV of a 35mm film camera on a Z7, buy a Letus or Redrock. If you don't want to use an adapter, then get a camera w/ larger chips like the 1/2" EX1 or EX3, or any of the costly 2/3" shoulder mount cameras (but those are $20k+++).

March 11th, 2009, 08:05 PM	#9
Jason LeFrense Regular Crew Join Date: Jun 2008 Location: Sydney Canada Posts: 126	I fought with the same problems and I have tried everything from lighting to shutter speeds and still could get the effect I was looking for. So I purchased the Brevis 35mm adapter and it makes a world of a difference. I'm extremely happy with the results. I would imagine the other 35mm adapters will work just as good.