As per Ryan's comment above +1 for the Delta Titanium if you can stretch the budget a fraction more (rrp $1200), Awesome glass for the money. Have recently purchased this for extra advantage of low light performance over my superzoom camera.
Here's a couple photos through the spotter via phoneskope, both Chamois & Fallow a fraction over 800m. Actual footage is clearer as these are screenshots from video
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