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Message: <blockquote data-quote="Troubador" data-source="post: 3432128" data-attributes="member: 109211">Interesting stuff VB but beware of drawing specific conclusions about T* based on one product and expecting them to be exactly applicable to another product. I believe T* is probably a family of coatings not just one coating and is probable tailored to suit different priorities and perhaps even different grades of glass in different  products.For example HT is an excellent all-round instrument but it has a special capability in low light (AK prisms and HT glass). SF is an excellent all-round instrument but I am sure it was not designed to compete with HT but to perform best in normal nature observing light levels. I would bet money on the T* coatings being different due to these different tasks.Lee</blockquote>