T* is Zeiss' name for their multicoating procedure (and the coating it produces). The Zeiss/Hasselblad lenses that are not T* coated have a Zeiss T (without the star) coating, which has less layers. Still good though.
The coatings are there to reduce reflections from the surfaces of the lens elements. This mainly reduces veiling glare, improving contrast, and makes them transmit more light (the light that otherwise would have been reflected now gets through to the film).
The lenses themselves generally are not different: a f/4 150 mm Sonnar, for instance, is the same, whether with or without T* coating.
It is true that you need to use a good lens shade.
But the beneficial effect of such a thing is much, much larger than the improvement from T to T* star coating brought.
Joined: May 22, 2008
Posted: May 22 2008 - 20:35
I believe it refers to coated lenses. Lenses without coating need to be shaded more carefully.
Ned
__________________________
Ned
Joined: Jul 07, 2007
Posted: May 24 2008 - 01:16
T* is Zeiss' name for their multicoating procedure (and the coating it produces). The Zeiss/Hasselblad lenses that are not T* coated have a Zeiss T (without the star) coating, which has less layers. Still good though.
The coatings are there to reduce reflections from the surfaces of the lens elements. This mainly reduces veiling glare, improving contrast, and makes them transmit more light (the light that otherwise would have been reflected now gets through to the film).
The lenses themselves generally are not different: a f/4 150 mm Sonnar, for instance, is the same, whether with or without T* coating.
It is true that you need to use a good lens shade.
But the beneficial effect of such a thing is much, much larger than the improvement from T to T* star coating brought.