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With reference to Greg's comments re TEC, TEC has announced that all future products will be all fluorite with the middle element. The TEC-140 recent production run is fluorite and has better blue correction than the previous ED model.
One item not specifically mentioned that needs to be considered in these choices is the back focus available when using the flattener. TEC BF for the FF is only 85mm which I personally found to be too short to accommodate gear I wanted to use.
Peter
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