OK so im planning to buy myself a canon eos 400d (aps-c) to use with my pentax k lense collection. However I'm concerned about the pentax k to canon ef adapter not focusing to infinity, can you guys recommend a good ebay listing/ adapter brand that i should buy from? I don't want to spend more than like £50 as it defeats the point of this cheap experiment but i also dont want to spend £10 and end up with an adapter that doesn't infinity focus. I also read that sometimes the inability to focus to infinity depends on the lense and not actually on the adapter, is that true?