What is the difference between a T* lens and the rest of the lenses? jonnrossi [at] gmail.com
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.
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I believe it refers to coated lenses. Lenses without coating need to be shaded more carefully.
Ned