Physical Camera

[archkre]

If I put a Physical Camera in which:

F-number= 16

Film speed= 200

What is the correct value for Shutter speed so the camera looks right?

How do you get to that value( is there any calculation)?

Thanks

[Brian Smith]

typical settings for a midday sunny scene are

 

fstop=8

film speed=200

shutter speed=125

 

if you have a darker scene, like a sunset scene, you need the shutter to be open longer, the film to be faster, or the aperture opening to be bigger. if you have a brighter scene just the opposite. standard settings on a camera and standard film speeds are given in increments that either double or halve the amount of light that's allowed to strike the film.

[Tommy L]

Do you know how a slr camera works and what the settings mean?

[diegofer_9]

Tommy,

I am afraid your question will basically require a whole book or at least a whole thread to answer. Do some research online. i definetly need to learn a lot from slr cameras but if you look a little into understanding exposure (how long the lens remains open for light to enter) and aperture (the size of the "hole" through which light enters and hits the film), you are at a good point to start. Film speed is a little easier since you probably wont have to learn a lot to basically use 100-200 for exteriors and 200-400 for interiors, IMHO. The speed of the film means how sensible it is to light. The higher the number, the more sensible it is to light, so it is better for darker situations I.E. interiors.

Good luck, I still have to learn a lot also as you can see.

D.

[archkre]

I've read the article @ http://Http://www.setzler.net about exposure with some table settings, but none of them work OK. in my renders!

[archkre]

typical settings for a midday sunny scene are

 

fstop=8

film speed=200

shutter speed=125

 

QUOTE]

What color mapping is your favorite for those camera settings for a sunny day and exterior: HSVexponential or Linear Multiply with gamma=2.2 or which one?

 

Thanks

[Ray]

Try this:

http://www.robert-barrett.com/photo/exposure_calculator.html

[Tommy L]

Tommy,

I am afraid your question will basically require a whole book or at least a whole thread to answer.

D.

 

Not really, The basic principles can be picked up in a chapter or two of an introductry book of photography.

 

 

There are only 4 exposure parameters that change in photography:

 

1 shutter time (seconds)

2 aperture (lens diaphram diameter, size of hole the light passes thru)

3 film speed (sensitivity of medium to light)

4 available light

 

Its worth learning these terms and their intrinsic meaning. It is valuable to a visualiser, not only using vray sun, but in imagery in general; photo-matching etc.

[diegofer_9]

Tommy,

I thought you were asking if anyone knows how an SLR camera works. I didnt understand you were just directing your question to archkre, so nerver mind my post.

[Tommy L]

Oh, I see what you mean! It does look like one of those "can you just tell me everything please?" posts doesnt it...

[andstef]

There is a nice video-tutorial about physical camera and sun-sky setting on chaos group forum under Tutorials - tips and tricks. It comes along with a script, quite easy to use. Worked fine for me.

Heres the link:

http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=17824

 

Have fun rendering!

Cheers

[Christopher Nichols]

The basic rule is called "Sunny 16."

 

http://en.wikipedia.org/wiki/Sunny_16_rule

 

Meaning that mid day sunny lighting, if you set your set your f-stop at 16 then your exposure should be 1/ISO... so if your ISO is 100 then your exposure should be 1/100 (or 1/125 if you prefer).

[archkre]

I set my render/sun/ physical camera with Sunny 16 rule and 1/125 and ISO 100, but it looks absolutely overexposed indeed.Maybe I messed up in the way to understand Linear workflow and and I am doubling my 2.2's!!!!

I set preferences/gamma-lut=2.2 affecting materials,

sun /physical camera with Sunny 16 and 1/125 and ISO 100, and color mapping HSVexponential with Gamma=2.2

What is wrong in this procedure?

Thanks

[jophus14]

http://en.wikipedia.org/wiki/Sunny_16_rule

 

In this link they talk about setting shutter speed to 1/100 or 1/125 second if your ISO is set to 100. Is Vray's Physical camera shutter speed amount already broken down into fractions? What I mean is that if I type 100 in the ISO dialog box, all I have to type into the Shutter Speed dialog box is either 100 or 125, correct? You would never have to type in 1/100 or 1/125. I never thought about having my F number set to 16 because it seems like the image would be too dark.

 

According to Spot3d.com:

The LOWER the F number = The brighter the image

The LOWER the Shutter Speed = The brighter the image

The HIGHER the ISO = The brighter the image

[Advisor]

I think you should leave your color maping at linear and use 2.2 gamma in VRay frame buffer since if you saved it as High dynamic range it'll be corrected in photoshop automatically via the embeded sRGB default profile

or if you want to use gamma correction type

[Zdravko Barisic]

I've read the article @ http://Http://www.setzler.net about exposure with some table settings, but none of them work OK. in my renders!

 

VR CAm does not really matter about real life camera settings!!!

yu have to find some similar way, it works on his own but lets say "offset for some value"

[Zdravko Barisic]

I set my render/sun/ physical camera with Sunny 16 rule and 1/125 and ISO 100, but it looks absolutely overexposed indeed.Maybe I messed up in the way to understand Linear workflow and and I am doubling my 2.2's!!!!

I set preferences/gamma-lut=2.2 affecting materials,

sun /physical camera with Sunny 16 and 1/125 and ISO 100, and color mapping HSVexponential with Gamma=2.2

What is wrong in this procedure?

Thanks

 

here I am, sorry for "overposting"

Almost the most easy way is to stick with

REINHARD color mapping, check the burn value to 0.5 and start the playing w/it

you'll get some washed textures some times but it also can be corected with darkening the mats in MAX mat slot