8mm Forum: What is lens bloom?

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Topic: What is lens bloom?

Alan Rik
Film God

Posts: 2211
From: New York City, NY, USA
Registered: Jun 2003

posted March 04, 2005 07:56 PM

Hi! Yes.. its Alan R. posting day! (sorry Kev.. just trying to catch up!)
What is lens bloom? I looked it up on the internet and couldn't find anything on it.
All that came up was Orlando Bloom. Who is he anyways? [Smile]

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted March 05, 2005 04:27 AM

Len bloom is when something or other contaminates the coating on the lens. In some of the Elmo lenses you can see lens bloom on the inside elements. I was told a long time ago that this was caused by some adhesive that was used in the manufacture of these lenses breaking down and attacking the lens coatings on the inside. It makes the lens look as if its got a smokey coating on the inside when you view it with the projector lamp running.
Very often a strip down of the lens and a good clean will remove it but in very bad cases the only answer is to have the lens recoated.

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted March 05, 2005 09:00 AM

Next time you Google around, try putting your search phrase in quotes, i.e. "lens bloom" instead of lens bloom [Wink]

as for Orlando Bloom, he's your typical young-stud Hollywood actor having appeared in recent features such as Pirates of the Caribbean and Troy... [Big Grin]

Back to the lens bloom... is that the one that would cause a kind of giant halo to appear around the rectangular projection image on the screen, with the halo somewhat lighting up the entire room?

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Call me Phoenix. *dusts off the ashes*

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Douglas Meltzer
Moderator

Posts: 4554
From: New York, NY, USA
Registered: Jun 2003

posted March 05, 2005 02:38 PM

Lens bloom makes your footage look as if it was shot with a diffusion filter. The highlights are spread out and the contrast is softened. In extreme cases, Jan's halo effect takes place, similar to looking at a bright window through a piece of gauze.

Doug

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I think there's room for just one more film.....

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