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With all the talk about the Tamron 150-600mm, I've been looking for a cheaper way to get it super telephoto nature photography. I'm moving to Montana in a matter of months and I will be living close to Yellowstone. I've already gone out and photographed the landscape but I have no real way of getting the animals at a safe distance. I have a 200mm F/2.8 II which is just not long enough. In comes the idea of using a Pentax Q as a teleconverter. I've been looking online at the prices of them and it looks like you can pick them up for about $150 or so and an adapter for $20. I haven't taken the dive and gotten them yet in fear of poor image quality. I can only think that having a 5.6 or a 4.7 times crop factor would bring all of the small imperfections of a lens out. If anyone has tried using a Pentax Q with an adapter I would love to know how well it works. Having a 1120mm F/2.8 sounds pretty awesome to me!