F Bulgarelli Posted August 22, 2009 Share Posted August 22, 2009 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 More sharing options...
Chris Millar Posted August 22, 2009 Share Posted August 22, 2009 square iris, yes. Modify a lens (open it up and replace the iris) or at least on a Bolex both the PTL and POE zooms have a two blade design that will achieve similar effects although oriented 45deg into a diamond shape ... Link to comment Share on other sites More sharing options...
Jim Hyslop Posted August 22, 2009 Share Posted August 22, 2009 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 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 More sharing options...
Sherman Johnson Posted August 22, 2009 Share Posted August 22, 2009 Looks like it's perhaps a hard matte in the matte box... Probably a matte size that's smaller than the diameter of the front element... Link to comment Share on other sites More sharing options...
Tom Jensen Posted August 22, 2009 Share Posted August 22, 2009 Out of focus practicals? Link to comment Share on other sites More sharing options...
Chris Millar Posted August 22, 2009 Share Posted August 22, 2009 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 More sharing options...
Chris Millar Posted August 22, 2009 Share Posted August 22, 2009 Out of focus practicals? I think the edges are too sharp for this - but yes its an option huh ;) - time consuming ! Link to comment Share on other sites More sharing options...
Richard Vialet Posted August 22, 2009 Share Posted August 22, 2009 Yea it seems like a hard matte on the mattebox effect. Aren't there some anamorphic zooms and telephoto primes that have square bokeh like that as well? Link to comment Share on other sites More sharing options...
F Bulgarelli Posted August 22, 2009 Author Share Posted August 22, 2009 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 Link to comment Share on other sites More sharing options...
Bruce Greene Posted August 22, 2009 Share Posted August 22, 2009 yeah, it might be a square/rectangular iris? interestingthe 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 More sharing options...
Premium Member Satsuki Murashige Posted August 22, 2009 Premium Member Share Posted August 22, 2009 Hey Francisco, Here's a thread that explains the two causes: http://www.cinematography.com/index.php?sh...hl=square+bokeh. Link to comment Share on other sites More sharing options...
Leo Anthony Vale Posted August 22, 2009 Share Posted August 22, 2009 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 More sharing options...
F Bulgarelli Posted August 23, 2009 Author Share Posted August 23, 2009 Thanks guys, anamorphic zooms, sounds like that's the answer Link to comment Share on other sites More sharing options...
Nathan Martin Posted August 23, 2009 Share Posted August 23, 2009 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 More sharing options...
boy yniguez Posted August 28, 2009 Share Posted August 28, 2009 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 More sharing options...
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