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Message: <blockquote data-quote="dwever" data-source="post: 3532062" data-attributes="member: 118803">Below is an internet picture of the 40-150 f/2.8 Pro with and without the TC1.4 on an E-M1.  I own this same set up with an E-M1 Mark II (bought from B&H)Unlike DSLR's from Nikon and Canon where their implementation of teleconverters has of late with certain glass reached a point of virtually zero compromise in resolving power, the Olympus system has not pulled this off with about a worst case loss of about 8% at 150mm depending on the aperture selected.So, as I prepare to go out with the North Alabama Birding Society this Saturday, I am still undecided on whether to use the 1.4 TC or just stay with the phenomenal lens and hope I don't have to crop too much later on.  Admittedly the results are so close my comments are pixel peeping and my decision will rest on how far my shots are, but my wish is for a 4/3 format that calls itself a legitimate alternative for pros and prosumers that they would in fact make legitimate parallels or lead in this area of optical technology.Having said that, I am thrilled with an extremely small, lightweight, fully weather-sealed TC that doesn't significantly negatively impact image quality or AF speed. But for the Olympus 40-150mm ƒ/2.8 Zuiko Pro or the 300mm ƒ/4 Zuiko Pro lens, the MC-14 teleconverter is a an accessory that needs to close the gap just a pinch.I'll try and update this post with the actual resolution differences between TC 1.4 and without.</blockquote>

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