Non-Nikon Zoom Lens for Nikon D300s?

[itisgregory]

I want to purchase a non-nikon zoom lens for the D300s for wildlife. I already have the Nikon 70-300mm f/4.5-5.6 but CANNOT afford the $5,000-$10,000 for the Nikon lens that have a much farther reach. I was looking at the Sigma (50-500mm, 150-500mm) and Tamron (200-500mm). These are under $1,100. I am fully aware that these are "slower" lenses in low light, not as superior as a Nikon lens and lack some Nikon features; however price is the issue and I am not a professional photographer.

What manufactures AND lenses would you recommend? I am not stuck on Sigma or Tamron. I mentioned those because they seem very popular. Any comments are GREATLY appreciated.

Sincerely
Gregory

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[KmH]

I have and use a couple of the Sigma APO 150-500 mm's for field sports. I shot the eagle in my avatar with the Sigma @500mm handheld, with OS on, from about 200 feet.
Be advised: LensRental.com quit buying that lens and the 50-500 mm lenses from Sigma because they had to many had problems.

I have had no problems with mine, but the one's I bought were from their early production.

[itisgregory]

Thanks for the helpful information. I will research more.

[djacobox372]

you might be able to find a nikkor 600mm f5.6 ais for 1500 or so. its manual focus, but has amazing iq wide open--definately the best iq for the $$ at 500+ mm