Robert Anderson
23-Apr-1999, 17:15
I need to tap into the knowledge base of you die-hard LF users. This is probably a no brainer, but I can't figure it out, guess we all know what that means!
A ghost image is appearing within the frame on the final film that is not discer nable on the ground glass, but only under certain circumstances, usually involvi ng direct light [sun]. The lighting angle is not into the camera position, usual ly 30 degrees or more out of frame. The ghost is usually the size of a dime, and is a non-mirrored, 50% intensity likeness of a bright object within the frame.
I would like to know why this happens, and how to eliminate it.
It appears to be related to any bright object [in direct light, or from direct l ight] that is within the composition, that is approximately +1 1/2 to +2 stops o ver the base exposure. It also seems to happen more often when this object/zone [has happened with potted flowers, as well as with a sun spot on the exterior of an adobe house] is located in the outside 1/3 of the frame, but not always. It has happened with all of my lenses, and both with and with out camera movements.
I have purposely re-shot several of the shots with different combinations of len ses, apertures, bed angle, movements, etc. all to no avail! The simple answer is to shoot in total shade, but that is not applicable for this assignment [archit ectural exteriors].
The culprit:
Arca-Swiss F-line 4x5, std. & bag bellows, Caltar II N 75/6.8, 90/6.8, 135/5.6, 210/5.6, Arca Bino hood, Canham modified lens shade, all of this stuff is new. T he shots are proofed on Polaroid type 54 [NO GHOST VISIBLE!!] and final film sho t on Fuji Q/L RVP [With Ghosts] with Fuji Q/L film holder, typical exposure is f 22.5 @ 1/8 sec. though I've tried just about every other combination and bracket ing.
I typically shoot medium format on location, and use the 4x5 for product shots a nd interiors. I have never encountered this before. Any help would be most welco me and appreciated.
A ghost image is appearing within the frame on the final film that is not discer nable on the ground glass, but only under certain circumstances, usually involvi ng direct light [sun]. The lighting angle is not into the camera position, usual ly 30 degrees or more out of frame. The ghost is usually the size of a dime, and is a non-mirrored, 50% intensity likeness of a bright object within the frame.
I would like to know why this happens, and how to eliminate it.
It appears to be related to any bright object [in direct light, or from direct l ight] that is within the composition, that is approximately +1 1/2 to +2 stops o ver the base exposure. It also seems to happen more often when this object/zone [has happened with potted flowers, as well as with a sun spot on the exterior of an adobe house] is located in the outside 1/3 of the frame, but not always. It has happened with all of my lenses, and both with and with out camera movements.
I have purposely re-shot several of the shots with different combinations of len ses, apertures, bed angle, movements, etc. all to no avail! The simple answer is to shoot in total shade, but that is not applicable for this assignment [archit ectural exteriors].
The culprit:
Arca-Swiss F-line 4x5, std. & bag bellows, Caltar II N 75/6.8, 90/6.8, 135/5.6, 210/5.6, Arca Bino hood, Canham modified lens shade, all of this stuff is new. T he shots are proofed on Polaroid type 54 [NO GHOST VISIBLE!!] and final film sho t on Fuji Q/L RVP [With Ghosts] with Fuji Q/L film holder, typical exposure is f 22.5 @ 1/8 sec. though I've tried just about every other combination and bracket ing.
I typically shoot medium format on location, and use the 4x5 for product shots a nd interiors. I have never encountered this before. Any help would be most welco me and appreciated.