Both of these images were shot with the Nikon D7000 and 18-135mm lens. I take the UV filter off when shooting and only use it when packing the stuff back in my case. The extra glass is just more air to glass surface that's unnecessary.
Camera is in P mode ISO set to 100. Top photo f5.6 at 1/100th ss, lens 202mm DX.
ISO 100 f5.6 at 1/50th ss, lens 120mm DX.
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