I find myself in a lens buying quandary
And was wondering, has anyone used this DA* with extension tubes for macro ? If so, is there a best focal length (would like to hear that 135 is best

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Basically I need to get a longer macro than my DA35 for bugs and butterflies but funds are limited (arent they always). In UK right now a Pentax 100mm macro and DA*50-135 can be had for similar prices. Admittedly a Tamron 90 is cheaper but still not as flexible as the DA*, and I prefer to stick with Pentax glass
so one thought was to get a DA* 50-135 as it is most definitely the more useable/adaptable lens for me, to add to the two primes I currently use
But at about 1:6 reproduction it sure will suck for macro needs - a few quid will get me some Kenro auto extension tubes . . . so the 1:2 I will use is within easy reach
ta