Prismayic light: Camera T2i lens 24-108L @ 85 f 5.6 1/50" iso 400 Temp 2600° K raw capture camera profile, camera neutral. No PP except to change image size This shot taken...

pfredd

Camera T2i lens 24-108L @ 85 f 5.6 1/50" iso 400
Temp 2600° K raw capture camera profile, camera neutral. No PP except to change image size
This shot taken and submitted to illustrate the total disappearance of prismatic lights. In life this chandelier sparkles with hundreds points of prismatic lights, violet thru red. The capture you see here, and others taken of other cut glass fixtures, have none.
Are there any light science techs or lens designers who can explain the phenomenon.
The image here is to illustrate only, not to "fix". But feel free to play with RGB balance if you want to waste time.

Attached file:
(Download)

pfredd

pfredd wrote:

Camera T2i lens 24-108L @ 85 f 5.6 1/50"... (show quote)

UP-2-IT Loc: RED STICK, LA

Not really a lot to explain, in the case of the picture you posted with the absense if direct lighting there would be no prism effect. It appears that dthe lighting used for the display was indirect lighting If you look at the ceiling lights in most modern offices the plastic covers are molded to do away with the prism effect.

ShakyShutter Loc: Arizona

For the result you are looking for the light striking the crystals has to contain the colors of light you expect to see.

Tungsten light has a pretty narrow and warm light and strobe lights are also fairly narrow but it's close to sunlight in color.

Place this object in sunlight which has all the colors or mixed light with bright sharp light sources and it will sparkle like no bodies business.

English_Wolf Loc: Near Pensacola, FL

pfredd wrote:

.../... This shot taken and submitted to illustrate the total disappearance of prismatic lights. In life this chandelier sparkles with hundreds points of prismatic lights, violet thru red. The capture you see here, and others taken of other cut glass fixtures, have none. .../...

Are you saying that you saw the reflections when you took the pictures and did not see them when looking at it?

birdpix Loc: South East Pennsylvania

Try backlighting it. Especially with sunlight.

pfredd

Yes, I said In life this chandelier sparkles with hundreds points of prismatic light. These coloured shards of light are being produced by incandescent bulbs within the fixture, which is very large and hangs inside where the sun don't shine.
To restate the question in simplicity ... " Why do our eyes see bright rays of coloured light which the camera does not capture them" ?

English_Wolf Loc: Near Pensacola, FL

Now that is odd. I have never experienced this.

A question comes to mind, are using ANY filter on your lens?

Can you post the full original so that we can look at it 1:1 vs a thumbnail?

I had the case of a 'disappearing waiter' on a picture one time. Took me a long time to realize why.

pfredd

English_Wolf wrote:

Now that is odd. I have never experienced this.

A question comes to mind, are using ANY filter on your lens?

Can you post the full original so that we can look at it 1:1 vs a thumbnail?

I had the case of a 'disappearing waiter' on a picture one time. Took me a long time to realize why.

Wa

pfredd

English_Wolf wrote:

Now that is odd. I have never experienced this.

A question comes to mind, are using ANY filter on your lens?

Can you post the full original so that we can look at it 1:1 vs a thumbnail?

I had the case of a 'disappearing waiter' on a picture one time. Took me a long time to realize why.

Was rather hoping for your oar in the water. So, no filter, no glass at all in front of lens. The subject is near 40 ft. tall. The shot was taken about mid point up and at a distance 25 ± ft. Here is a crop ( to reduce file size ) at mid point showing about 2 ft. of the total height. The other 38 ft. are just more of the same. The lighting is by bulbs inside this cylinder comprised of strands of crystal glass 'beads'. A guess only the bulbs are clear incandescent 440V as used in traffic signals. Sharp bright coloured sparkles are seen by eye throughout the fixture. The camera captures NO colour data in the subject, however background contained a small blue sign lit by light cast from subject and a bit of neon sign both full colour.
As to your disappearing waiter, well, we've all had that. I find tipping helps
Cheers

English_Wolf Loc: Near Pensacola, FL

Not the original so... The size here does not matter (as far as thumbnails go).

Click "store original" next to the browse case.

pfredd

English_Wolf wrote:

Not the original so... The size here does not matter (as far as thumbnails go).

Click "store original" next to the browse case.

Right you are.

3Dean Loc: Southern California

pfredd wrote:

Sharp bright coloured sparkles are seen by eye throughout the fixture. The camera captures NO colour data in the subject...

I think the color sparkles are just being overpowered by the brightness of the lamp. Retake the picture, but this time underexpose it.

I was able to isolate some of the color sparkles with some Photoshop adjustments of Levels, Color Balance, and Saturation.

English_Wolf Loc: Near Pensacola, FL

Yup, same results. (3Dean results are better than mine so, no post).

One thing, on 11 I am surprised by the lack of details....

1:1

pfredd

I was able to isolate some of the color sparkles with some Photoshop adjustments of Levels, Color Balance, and Saturation.[/quote]

A fine job of emphasizing some bits of colour. The 2 attached are #1 3 stops under 6.3 1/50 84mm Adobe RGB 1998 3800°K #2 5.6 1/6 28mm 3200° K This is light as seen by eye except no brilliant sparkles. I am in the lobby where this light hangs about 1 day each year, and have tried to capture every time, using different equipment but always same dull result.
All shots are hand held, but the lack of sharpness is due to poor focus. Neither the lens or my eye of either viewfinder can see good focus. I see by the neon 'S' and the blue bar sign in #2 that focus is well beyond the light, by about 50 ft.
I do appreciate all help in discovering the 'why', even though it is nothing photo.