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How do You call this trick : cut out a shape in the center of a black thick paper and tape it on the front of Your lens.
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Dec 9, 2022 17:37:16   #
Dan' de Bourgogne
 
This way, while focusing at very close distance and setting the widest aperture , the "not focused" highlights take the shape of the cut hole.
I suppose such items do exist with different shapes, for diff. diameter.
How do you call those "filters"?
I would like to buy a set of such "things" but under the name "filter", I can't find them. (I know, they are not a filter!)

here the hole I cut was a heart ca 22 mm big...The lens was Nikkor 50 mm, f/1.4 opened at f/1.8
here the hole I cut was a heart ca 22 mm big...The...
(Download)

here the hole I cut was a bird ca 26 mm big...The lens was Tamron 90 mm macro, f/2.8 opened at f/3.2
here the hole I cut was a bird ca 26 mm big...The ...
(Download)

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Dec 9, 2022 17:59:33   #
NMGal Loc: NE NM
 
Fascinating.

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Dec 9, 2022 18:40:01   #
Architect1776 Loc: In my mind
 
Dan' de Bourgogne wrote:
This way, while focusing at very close distance and setting the widest aperture , the "not focused" highlights take the shape of the cut hole.
I suppose such items do exist with different shapes, for diff. diameter.
How do you call those "filters"?
I would like to buy a set of such "things" but under the name "filter", I can't find them. (I know, they are not a filter!)



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Dec 9, 2022 19:03:11   #
TriX Loc: Raleigh, NC
 
Cokin makes these with cutouts of various shapes - there’s a set of them in this old post: https://www.uglyhedgehog.com/t-444168-1.html

If they’re of interest to you, I can take some images of the cutouts available. Notice that Cokins come in various sizes for different lens front elements. These are for 62 mm max, but the P series accommodates larger sizes.

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Dec 9, 2022 19:19:40   #
E.L.. Shapiro Loc: Ottawa, Ontario Canada
 
At wide apertures, just about any opaque cutout that you place in a clear filter near the center of the lens will cause the bokeh image to take on that shape. Of course, the cutout needs t be small enough not to block the entire light path.

Personally, I am not a fan of hearts and such but a piece of black pinstripe tape across an old skylight filter can make for some nice brushstroke-like backgrounds. At anywhere between f/ and/ f'2.8, this will work well on a typical head and shoulders portrait distance with a 75mm-200mm focal length.

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Dec 9, 2022 21:06:39   #
User ID
 
The current term is actually "bokeh filter". That will work for any searches you care to attempt.

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Dec 9, 2022 21:53:21   #
Bill_de Loc: US
 
User ID wrote:
The current term is actually "bokeh filter". That will work for any searches you care to attempt.


Thanks. Never heard of these.

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Dec 9, 2022 23:15:46   #
User ID
 
Bill_de wrote:
Thanks. Never heard of these.

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I simply cannot recall the really proper term and it bothers me. So I searched and searched various descriptions with and without the terms "mat box" and "vignette". I really worked at it.

Not one search turned up the "classic" proper term but each and every search led to this uglee new term which I had never heard until now, "Bokeh Filter".

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Dec 10, 2022 05:21:43   #
Manglesphoto Loc: 70 miles south of St.Louis
 
User ID wrote:
I simply cannot recall the really proper term and it bothers me. So I searched and searched various descriptions with and without the terms "mat box" and "vignette". I really worked at it.

Not one search turned up the "classic" proper term but each and every search led to this uglee new term which I had never heard until now, "Bokeh Filter".


I have heard them called "Scrims"

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Dec 10, 2022 09:13:45   #
AnnH
 
Try looking for "bokeh overlay" along with the shape you are looking for, like "star bokeh overlay". There are quite a few free ones you can download so include free in your search you can find some to play with. I haven't used any but in tutorials I have watched you may have to mask out areas where you don't want the shapes, such as on the face in a portrait.

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Dec 10, 2022 10:13:00   #
twowindsbear
 
This was HUGE back in the mid- to late- 70's with wedding photographers.

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Dec 10, 2022 11:50:05   #
User ID
 
Manglesphoto wrote:
I have heard them called "Scrims"

I know scrims as used in lighting, but never heard that term connected with mat boxes or lens accessories.

Thanks but Im still banging my head against a wall about this ... but more gently as I consider giving up.

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Dec 10, 2022 12:59:00   #
E.L.. Shapiro Loc: Ottawa, Ontario Canada
 
User ID wrote:
I know scrims as used in lighting, but never heard that term connected with mat boxes or lens accessories.

Thanks but Im still banging my head against a wall about this ... but more gently as I consider giving up.


Please stop banging your head against the wall, that can cause brain damage! Or, at least property damage.

They're all kinds of terminology, some overlap from optics to lighting. A SCRIM is a sheet of diffusion material that is stretched on a frame and is placed between a light source and the subject. A GOBO is shot for a Go-Between usually applied to an opaque light-blocking unit. These terms are somets used for light shaping inserts for projectors, optical spotlights, and accessory optical snoots.

If I can recall my optical class from the last century, the shaping of "bokeh" blobs into cute stuff is called "lightpath interference" which shows up in out-of-focus backgrounds at wide apertures and will not greatly affect the in-focus image.

It is usually not an aperture cutout but an opaque element. Think of a cookie cutter- ir s not the dough you throw away or reuse- it is the dough you shape and bake to make the cookies.

You can make the cutouts out of black paper or black masking tape and affix the to a discarded skylight or clear filter. Or, you can buy this kit (see attached photo) on eBay for a few bucks. Notice the cutout is black in the center of a clear filter. The kit has a variety of shapes.





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Dec 10, 2022 13:42:58   #
BigOldArt Loc: Seminole, FL
 
TriX wrote:
Cokin makes these with cutouts of various shapes - there’s a set of them in this old post: https://www.uglyhedgehog.com/t-444168-1.html

If they’re of interest to you, I can take some images of the cutouts available. Notice that Cokins come in various sizes for different lens front elements. These are for 62 mm max, but the P series accommodates larger sizes.


Can one get the same effects in Post Processing?

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Dec 10, 2022 14:00:29   #
User ID
 
E.L.. Shapiro wrote:
Please stop banging your head against the wall, that can cause brain damage! Or, at least property damage.

They're all kinds of terminology, some overlap from optics to lighting. A SCRIM is a sheet of diffusion material that is stretched on a frame and is placed between a light source and the subject. A GOBO is shot for a Go-Between usually applied to an opaque light-blocking unit. These terms are somets used for light shaping inserts for projectors, optical spotlights, and accessory optical snoots.

If I can recall my optical class from the last century, the shaping of "bokeh" blobs into cute stuff is called "lightpath interference" which shows up in out-of-focus backgrounds at wide apertures and will not greatly affect the in-focus image.

It is usually not an aperture cutout but an opaque element. Think of a cookie cutter- ir s not the dough you throw away or reuse- it is the dough you shape and bake to make the cookies.

You can make the cutouts out of black paper or black masking tape and affix the to a discarded skylight or clear filter. Or, you can buy this kit (see attached photo) on eBay for a few bucks. Notice the cutout is black in the center of a clear filter. The kit has a variety of shapes.
Please stop banging your head against the wall, th... (show quote)

In some back alley of my mind Ive been believing that there was a specific name for the lens-mounted cut out out shape, typically a trite heart or key hole.

Scrims and gobos are for lights, not for lenses. Maybe there really is no such name after all. Its just my imagination. The current widely used term, "bokeh filter" is simply grotesque.

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