05-06-2010, 01:24 PM
RAMd®d wrote:
focus was hard with these lenses but more “cine-style” lenses are being made as we speak.
Can somebody explain what feature(s) make a lens a "cine-style" lens?
Reduced (on none) breathing when focusing.
Long focus throw.
Smooth and repeatable focus, zoom and iris rings i.e. direct link from ring to mechanism with end stops (and no click stops).
Gears on focus, zoom and iris.
No image movement when focusing.
Centered tracking when zooming.
Parfocal.
Front element doesn't extend or rotate when focusing or zooming.
Focus (especially infinity) doesn't change with temperature.
Colour matched across different lenses.
Low flare.
Low distortion.
For example Zeiss have a series of lenses for stills and cine use.
The glass is the same, but they are housed differently.
The stills versions are about $1,000 each.
The cine versions are about $4,000 each.
A typical cine prime lens can easily cost 20, 30 or even 40 grand.
A typical cine zoom lens can easily cost well over 100 grand and they don't even cover full frame i.e. the cine frame is more like 1.4x crop.