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Message: <blockquote data-quote="hark" data-source="post: 734492" data-attributes="member: 13196">I have the 300mm f/4 PF and have used it with a Nikon 1.4x TC as well as a Nikon 1.7x TC. I prefer the reach of the 1.7x TC but wide open it is f/6.7. Sometimes I miss shots which wasn't nearly so much of an issue when I used the 1.4x TC. As you mentioned, when used with the 1.4x TC, wide open it is f/5.6. I haven't found any other alternatives that are as light as this combo. I believe someone here bought a 70-300mm f/4.5-5.6 VR lens and attached a Kenko TC. But there is a more noticeable degrading of images with that TC. The Nikon teleconverters are worth the cost when it comes to quality. But only you can justify the cost.</blockquote>