Jump to content

square, out of focus highlights


F Bulgarelli

Recommended Posts

Hello,

 

Does anyone know how to obtain this effect?

 

http://www.youtube.com/watch?v=EdZZLdjBfCI

 

about 39 seconds into the trailer

 

It's in the movie "the Sister Keeper"

 

The car headlights and other highlights appear square

 

Could be a special iris or maybe just one of those filters with square grids,

 

any thoughts?

 

thanks

 

Francisco

Link to comment
Share on other sites

Does anyone know how to obtain this effect?

 

http://www.youtube.com/watch?v=EdZZLdjBfCI

 

about 39 seconds into the trailer

 

[...]

 

Could be a special iris or maybe just one of those filters with square grids,

 

If by "square grids" you're referring to filters like this

 

cross.jpg

 

then no - those are called star filters.

 

You can create your own custom bokeh effects. Have a look here.

 

--

Jim

Link to comment
Share on other sites

You can create your own custom bokeh effects. Have a look here.

 

--

Jim

 

With those you'll get out of focus effects on highlights that should otherwise be more in focus... And in all likelihood would look quite nice, but unpredictable. Basically Im saying that you can no longer trust your lens to operate/focus as you would normally.

 

By replacing the iris as I have suggested you'll still be able to pull focus and have expected results (to a point) - exposure you'll have to nut out either with a bit of fore-thought or experimentation.

Link to comment
Share on other sites

yeah, it might be a square/rectangular iris? interesting

the thing is, they are shooting night which would have required an open or almost wide open aperture

 

I haven't seen the clip, but this is usually caused by a hard matte in the matte box at wide aperture. Try making some mattes in the shape you want and experiment. You can see the effect in the viewfinder. It only shows on out of focus highlights like headlights and such.

 

It drove me crazy, until I figured it out, when I didn't want it:)

Link to comment
Share on other sites

The car headlights and other highlights appear square

 

Could be a special iris or maybe just one of those filters with square grids,

 

One often sees that bokeh with Cooke zooms.

Because they usually have the square matte at the front of the lens.

 

usually the 20-100mm, also the 20-60mm & some of the 25-250mm models.

 

http://www.redrental.co.il/redrental/img.a...images/zoom2%20

 

q=tbn:9dzeGcon91YXtM:http://www.abelcine.com/store/image.php%3Fproductid%3D1001102"]http://tbn2.google.com/images?q=tbn:9dzeGc...uctid%3D1001102[/url]

Link to comment
Share on other sites

I was playing around with this effect today actually. The way I do it is to make an additional iris. I cut a piece of black card to sit over the rear element of the lens, then cut the desired shape out of the card and tape it to the back of the lens. If shooting on filM

you will need a bit of testing to check your exposure compensation

Link to comment
Share on other sites

Hello,

 

Does anyone know how to obtain this effect?

 

http://www.youtube.com/watch?v=EdZZLdjBfCI

 

about 39 seconds into the trailer

 

It's in the movie "the Sister Keeper"

 

The car headlights and other highlights appear square

 

Could be a special iris or maybe just one of those filters with square grids,

 

any thoughts?

 

thanks

 

Francisco

 

hello, francisco,

sherman is correct about the mattebox. it happens when the ac puts an 85mm mask on the mattebox when shooting with a telephoto thinking " hey the angle of acceptance of the 85mm is wider than longer telephotos so it must be fine". WRONG! the diameter of the front element has to be taken into consideration, a smaller mask actually is cutting light that's supposed to enter the outer edges of the lens thus decreasing exposure. since objects very near the telephoto lens disappear, you won't see this cut-offs in the sides of the image, only in the bokeh!

 

boy

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...