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Message: <blockquote data-quote="aroy" data-source="post: 277611" data-attributes="member: 16090">Add a TC1.4 and you get a 420mm lense. With TC2.0 you get a 600mm lense, but with deteriorated quality. At times it is better to get a small sharp and contrasty image rather than a big low contrast image. This is a trade off which has to be experienced and decided on personally.Normally for small birds the high megapixel DX format will yeald better image simply because the subject is much smaller than the sensor and 1/2 inch high subject on a 24MP FF sensor will have less pixels than on a 24MP DX sensor. FF has an advantage only when its full real estate is utilised. With the DR of lower end FX and DX sensors for the same MP within a stop of each other, unless you shoot at high ISO, image quality is practically same.</blockquote>