[MEK]

I currently own the Sigma 105 and Tamron 90 Macro Lenses ( Pentax Mount ) as well a D-FA 100 Pentax Macro Lens ( as well a few others )
And from the Samples I own , there is little to no difference between the Sigma and Tamron ( For Me )
The D-FA100 is no better from what I can see ...

So that means I pretty much have to try the Tokina ...
I also want to try a larger lens , and 150mm works rather well for macro , ??
Oh well , hopefully no rush ...

[sejac]

Mek, I have the Canon 180mm macro. Great lens. A bit of a challenge to use, but gives some very nice results.

[MEK]

I have used 100mm Lens with 1.5x and 2x Tele converters , With the crop factor , I like 150mm .. Anything more becomes very hard to Free Hand