What is the "AURA" effect with IR film?

[sanking]

Some IR comparisons:

http://www.digitaltruth.com/products...sts2/index.php

Wow, great link. But quite surprised to see a film comparison on a digital site?

Sandy

[Vaughn]

Vaughn:
...To get the shot one has to wade out and set up on a ledge just a few feet from the second (steeper) part of the falls so it's a treacherous spot. And I'm not as young and fearless as I once was.

Cheers. Bob G.

Take care! Don't let your obit read "He died doing a re-shoot."

Near-by hikers found Bob floating below Raymondskill Falls. His last words were, "How's that aura, Dora?" Friends and family are confused as his wife's name is not Dora and Bob was not a known Zappa fan.

His relatives were able recover Bob's film holders downstream. His last image he made before he plunged over Raymondskill Falls was unharmed and it was developed. Generally, the family felt he did a better job the first time.

Vaughn

[Ron Marshall]

Wow, great link. But quite surprised to see a film comparison on a digital site?

Sandy

Their name never made sense to me as they sell mostly photo products.

They host The Massive Development Chart.



http://www.digitaltruth.com/

[Kirk Keyes]

EFKE make two versions of their IR 820 films the original has an anti-halation layer but it doesn't give the same effects as Kodak's old IR films, so they now also make "Aura" with no anti-halation layer.

So it's purely down to halation.

Ian

Another source could be from IR's ability to 'see' more deeply into the surface of a subject. Skin is fairly transparent in IR, as you may notice from how blood veins are rendered. So some subject surfaces are rendered a little softer.

But mostly, it's going to be the halation.

[Jim Michael]

The 120 rolls of the non-AH version we processed had a large number of emulsion defects. Using the dust & scratch filter with the threshold set to something like 32 saved a lot of retouching time.

Don't mistake that 820 for a film speed.

EFKE make two versions of their IR 820 films the original has an anti-halation layer but it doesn't give the same effects as Kodak's old IR films, so they now also make "Aura" with no anti-halation layer.

So it's purely down to halation.

Ian

[davemiller]

The flaring effect is much more evident in the smaller formats due to due to the greater degree of enlargement generally employed.

[rguinter]

Take care! Don't let your obit read "He died doing a re-shoot."

Near-by hikers found Bob floating below Raymondskill Falls. His last words were, "How's that aura, Dora?" Friends and family are confused as his wife's name is not Dora and Bob was not a known Zappa fan.

His relatives were able recover Bob's film holders downstream. His last image he made before he plunged over Raymondskill Falls was unharmed and it was developed. Generally, the family felt he did a better job the first time.

Vaughn

Yeah... but gotta get that winter shot with all the ice floes. Live dangerously... that's my motto.

Bob G.

[rguinter]

I looked through my summer 2010 photos and found a few more... these done with Efke Aura.

Typical exposures around f16 @ 1sec w/ B&W 092 filter.

The truck f22 @ 4 sec w/ B&W 092.

Cheers. Bob G.

[Brian C. Miller]

The first one demonstrates the reflection of sunlight. Note how the sun reflected off the cross produces a halo. The second one shows some halation from the willow tree. The crop is from the branches on the left. The lack of a halation layer allows the light to bleed, creating a halo. I would not expose the film this way on LF, as I'd rather just get the "wood" effect and have everything ultra crisp.

Kodak HIE, 35mm, Nikon FTN, 50mm lens, 092 filter.

[Thalmees]

FWIW, I have had good success shooting the Rollie product in both 120 and 4x5 using a Cokin 007 IR filter allowing 6 stops for the filter (i.e., ISO 6). The Cokin literature says to allow 6 stops for the filter and my spot meter confirmns that.

A good reference point here tgtaylor.
Thanks.