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I've just been having a quick look on eBay and it made me wonder, why is it that you can get a 300mm lens with IS and USM for £320 but if you want to step up to a 400mm then you're going to be paying £1,000+
Even if you were to add a teleconverter or an extender to the 300mm then it would still be over £500 cheaper... It has really confused me
Just to show I haven't made the numbers up:
70-300mm with IS and USM for £320
100-400mm with IS and USM for £1,100
2X Teleconverter for £330
Even if you were to add a teleconverter or an extender to the 300mm then it would still be over £500 cheaper... It has really confused me

Just to show I haven't made the numbers up:
70-300mm with IS and USM for £320
100-400mm with IS and USM for £1,100
2X Teleconverter for £330
