Chris Gloag, on Jun 6 2009, 07:04 PM, said:
How?
More questions...
Is it possible to attach any prime lens above a 45mm or 50mm?
They simply screw into the filter threads of the camera lens. Thread adapter rings may be needed
to fit one on to your lenses.
The camera lens' focus is set at infinity and all the focusing is done on the Iscorama.
Here are specs on some of the Iscorama lenses:
ISCORAMA-54
Magnification (horizontal).......1.5x
Distance Scale..........2m to infinity
Rear Barrel Diameter...........78mm
Rear Lens Element Diameter...54mm
Length..............................102.5mm (maximum)
Net Weight........................1000 grams
Filter Thread......................95mm
Rear Barrel Threading.........77mm
Light-loss Absorbtion...........1/3 Stop or less
ISCORAMA-42
Magnification (horizontal).......1.5x
Distance Scale...............2m to infinity
Front outside diameter..........87mm
Rear Barrel Diameter.............43mm(?)
Rear Lens Element Diameter...42mm
Length..............................83mm (maximum)
Net Weight........................750 grams
Filter Thread......................82mm
Rear Barrel Threading.........62mm
Light-loss Absorbtion...........1/3 Stop or less
ISCORAMA-36
Magnification (horizontal).......1.5x
Distance Scale...............2m to infinity
Front outside diameter..........76.2mm
Rear Barrel Diameter.............52mm(?)
Rear Lens Element Diameter...36mm
Length..............................73.9mm (maximum)
Net Weight........................400 grams
Filter Thread......................72mm
Rear Barrel Threading.........49mm
Light-loss Absorbtion...........1/3 Stop or less
ISCORAMA WIDESCREEN 2000
Magnification (horizontal).......1.5x
Distance Scale...............none (fixed focus range 6m-inf)
Front outside diameter..........59mm
Rear Barrel Diameter.............49mm
Rear Lens Element Diameter...36mm
Length..............................50mm (maximum)
Net Weight........................225 grams
Filter Thread......................none
Rear Barrel Threading.........49mm(?)
Light-loss Absorbtion...........1/3 Stop or less
http://lavender.fort...anamorphic.html
Nico's lens is apparently the Iscorama 2001, which is a single unit.
The earliest Iscoramas which came with a Nikon, M42 or Exacta mount were detachable in order to use the anamorphic on a slide projector.
One of the most unusual (and rare) lenses ever produced for the Exakta was the Isco Göttingen 50mm f2.8 Iscorama. During photo taking, the lens permits vertical or horizontal picture shrinkage. It's a two part lens, a modified automatic 50mm f2.8 and a special anamorphoser.
This is a very interesting lens and fun to play with. You can make short objects tall, fat objects thin, etc., just by depressing the two buttons and rotating the front elements.
---Capt.Jack's Exacta Page
http://captjack.exak...Isco%20page.htm
Yes they can be used on longer lenses. The front diameter of the camera lens shouldn't be larger than the back element diameter of the iscorama lens.