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Originally posted by FantasticMrFox That's often cited, but really not true. Compare some random Pentax lens to its Canon equivalent (e.g. 50 f/1.8, 16-50 vs 17-55, 16-85, 18-135, 55-300 vs 55-250 etc.) and you will find that Pentax rarely has a price advantage in lenses, often it's actually more pricey.
What you compared the numbers and you didn't post?
I'm going to do one comparison.
Canon 100 macro.. Canon EF 100 ƒ2.8 - $849
Pentax D FA 100 macro $399
I just picked the 100 macro randomly, it doesn't really encourage me to head off down the Canon is cheaper path.
OK, you talked me into it, one more...
Canon EF 50mm f/1.8 II Lens $114
Pentax smc DA 50mm f/1.8 Lens $116
Based on my sample of two lenses, Canon competes with Pentax on plastic fantastics, but not on specialized high quality glass.
One more for a tie breaker
Canon EF 200mm f/2.8L II USM Lens $749
Pentax DA* 200 ƒ2.8 $ 725
OK, you have to win by two...
Canon EF 35mm f/2 IS USM Lens $599
Pentax 35mm DA L F2.4 AL Lens $104
I'd be interested to see what you come up with to make your case.