The Denkmeier Upgrade offers not only the aperture from 40 to 60mm , but also the BF from 5mm to 10mm or even 15mm. I wonder if the ITF filter was replace also?

If that is so , anyone with a rusted ITF would worth taking up the upgrade, after all the cost of replacing the ITF is around usd100 already.

anyone any info is the ITF was also replace?

lee