Tracked perfectly on my i-Optron Skyguider Pro with 6lbs of counter weight. It also is great for birding, but not birds in flight since it is a manual focus lens. There is a REALLY handy focus marking lock which I used for focusing to infinity on the stars. Last picture of the Orion Nebulae was taken with this lens.Obviously this is a manual focus lens. Also accepts 40.5mm drop in filters which is great if you want to use light pollution or h-alpha filters for astro. Nikon 400mm f/3.5 light bucket lens. 122mm screw on metal lens cap. The item "Nikon NIKKOR AI-S ED 400mm f/3.5 Lens For Birds & Astrophotography D750 D4 D810a" is in sale since Monday, January 13, 2020. This item is in the category "Cameras & Photo\Lenses & Filters\Lenses". The seller is "zanetti2102" and is located in Mayer, Minnesota.
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