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Hi Mike,
I have the Tokina 12-24mm F4 which was released well before the 11mm - 16mm F2.8 Tokina. You are welcome to give that a try but it may not be what you're looking for in regards to an astro imaging lens, being F4 not F2.8. It's an excellent terrestrial lens, that within its design paramaters is possibly slightly better optically than the F2.8 lens.
Cheers,
John B
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