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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Beginners... shoot f8

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jlaurili said:
Does it matter if that 25mm is from a zoom lens or a prime? So if i'm using the RED zoom at 18mm then focus is no issue?
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Doesn't matter whether it's zoom or prime. Wide angle lenses like 18mm will be easier to focus because their DOF is deeper. If you're physically close to something you'll still need to be very accurate. Again - DOF charts will tell the tale. Start studying them now so the general measurements are in your head by the time you get your camera.
 
"how much effective db gain can be applied "

i was always under impression RED would NOT have any gain settings ???...
you would just under expose ( use higher ASA) and bring up ( make lighter) in post ..
depending on how much you under expose at some point noise would come into image ( when you lighten it)... the amount of noise that one likes/dislikes would be different for each persons ...
based on the Stump test i would not have problem rating the camera at ASA 640 - and probably up to 800 .... 1200 or higher it would depend on the scene/project .... also RED has better data in place today so the Stump test are out dated - soooooooooooo we'll have to wait for new test .. NAB should have some images at different ratings
 
joelnet said:
Doesn't matter whether it's zoom or prime. Wide angle lenses like 18mm will be easier to focus because their DOF is deeper. If you're physically close to something you'll still need to be very accurate. Again - DOF charts will tell the tale. Start studying them now so the general measurements are in your head by the time you get your camera.
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That sounds good to be, because i'm looking to go as wide as possible. And if the target it really close, I should just be able to measure the distance.
 
<It's the combo of long lens and open aperture that causes shallow DOF.>

And Focus Distance. How close you are to what you are focused on.

Then there's the argument that given the same framing, the focal length doesn't technically affect DOF. It just changes the characteristics of the image by either stretching or compressing perspective, thus making the background or foreground elements look more out of focus. This argument would state that technically it's only aperture and focus distance that affect DOF.

Here's an article on that:
http://www.bluesky-web.com/dofmyth.htm
 
acehole said:
F8 and be there!
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I'll do it if you will!


"...OK, everyone. We have clear, sunny skies. Grab the reflectors, we're shooting at high noon!"

Or...

"F8?? How the f@&$ am I supposed to afford the lights and utility bill to shoot at F8??? ...I just spent all my money on the camera!"
 
You right Gibby, shallow dof is not proper everywhere. It's just that deep dof comes natural and the shallow one is very difficult for me to achieve: think that to get it i shoot a reflected image in a spinning glass!
and now, pop, red, it's there.
I say wow.
 
donatello said:
the figures are from American Cinematographers manual ..based on 35mm format 24mm X 18mm...
they should be viewed as not exact figures but just showing how F8 and F2.8 have different DoF ...

seems to me that if a 25mm is always 25mm on any format then DoF should be the same - what will be different will be the field of view ...

you can have a 4k on a 24x18mm or 2/3" sensor ..
i believe the DoF will be the same if you have a 2/3 sensor that is 4k or 480p/i ?
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Given that the Red's sensor size is not exactly the same size as a 35mm frame, what conversion should be used in order to employ the American Cinematographer's DoF measurements? Does using Nikons rather than PL mount lenses affect these measurements?
 
Sean said:
Given that the Red's sensor size is not exactly the same size as a 35mm frame, what conversion should be used in order to employ the American Cinematographer's DoF measurements? Does using Nikons rather than PL mount lenses affect these measurements?
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Hi,

The 35mm DOF charts are a good starting point, HOWEVER a Red or any other digital sensor will have less DOF if your lenses are sharp enough! Film is not flat, a sensor is, there will be less fudge factor.

The mount has no effect on DOF but lens sharpness does. On film Zeiss lenses look sharper than Cooke lenses. This is because they transmit more blue light, Cookes transmit more red light. The red layer of film is less sharp than the blue layer.

Stephen
 
Stephen Williams said:
Hi,

... On film Zeiss lenses look sharper than Cooke lenses. This is because they transmit more blue light, Cookes transmit more red light. The red layer of film is less sharp than the blue layer.

Stephen
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Does this mean the Cooke lens will appear sharper with a digital sensor such as RedOne's?
 
joelnet said:
Doesn't matter whether it's zoom or prime. Wide angle lenses like 18mm will be easier to focus because their DOF is deeper. If you're physically close to something you'll still need to be very accurate. Again - DOF charts will tell the tale. Start studying them now so the general measurements are in your head by the time you get your camera.
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Hi,

Image magnification & F stop are the 2 things that effect DOF. If the image is the same size on the sensor the DOF is identical regardless of lens focal length.

Shoot people standing up head to toe in screen, then you will find focus pulling easy regardless of lens!

Stephen
 
Mardi_Gras said:
Does this mean the Cooke lens will appear sharper with a digital sensor such as RedOne's?
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Hi,

Yes, and they will appear to have less DOF than they do on film as a result!

Stephen
 
Stephen Williams said:
Film is not flat, a sensor is, there will be less fudge factor.
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Maybe I'm missing something, but film gets pressed flat when it's exposed. Any curvature in the film will be soft. I don't see where DOF comes into that equation.

One lens maybe be sharper than another so I suppose the sharper lens might give the feeling of greater DOF because more stuff is sharp.
 
Stephen Williams said:
Hi,

Yes, and they will appear to have less DOF than they do on film as a result!

Stephen
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This is rather confusing... less DOF, yet sharper overall image, how does that compute, pls clarify if you don't mind
 
Wait, this is the last straw!!!

First no Lens, no microphone, no monitor, no battery, and no hard drive...

Now you tell us that Red won't come with a Red Headed Focus puller?!!

Next thing your going to tell us is that it doesn't come with a DP either!!!

:)
 
joelnet said:
Maybe I'm missing something, but film gets pressed flat when it's exposed. Any curvature in the film will be soft. I don't see where DOF comes into that equation.

One lens maybe be sharper than another so I suppose the sharper lens might give the feeling of greater DOF because more stuff is sharp.
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Hi,

Film is never flat when running, fearly flat maybe!

A sharper lens will show less DOF, not more!

Stephen
 
Mardi_Gras said:
This is rather confusing... less DOF, yet sharper overall image, how does that compute, pls clarify if you don't mind
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Hi,

If the resoloution is higher then you will see more difference in what is in focus and what is soft. This gives the effect of less DOF.

One of the main reason that on 1/3 chip video cameras have a large DOF. Very little resoloution (nothing is sharp) everything is equally soft!

Stephen
 
Thom said:
Wait, this is the last straw!!!

First no Lens, no microphone, no monitor, no battery, and no hard drive...

Now you tell us that Red won't come with a Red Headed Focus puller?!![/quotequote]

Sure it does... He's 46 years old, about 6'4" tall and weights about 260lbs. On the bright side, if you feed him well and treat him right, he can carry your RED and other gear for you. You will also want to wash him regularly because he's known to stink. ...answers to the name "Fergus".

Next thing your going to tell us is that it doesn't come with a DP either!!!
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No DP...
Click to expand...
 
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