A short while back I was searching for a list of Pentax lenses along with a summary of the optimum aperture ranges to use with each to obtain the best resolution. It seems one didn't exist, so I decided to pull something together for the lenses I own, using data harvested from a number of lens review websites. Then, having put some effort into that, I extended it to include a wider range of DA and FA lenses. I figured it would be useful if I should ever think of buying any of these lenses, and may also come in handy for some forum members.
What these tables summarise is how well each lens resolves detail across the aperture settings, highlighting the optimum apertures to use for center and edge sharpness respectively. The source data often went no further than f/8, but as we know, performance will gradually tail off at this point due to diffraction.
This is a work in progress. So far I've covered most of the DA and FA primes, where data is available, and I've made a start on some of the zooms. My intention is to cover all DA and FA lenses over time.
I'd welcome any constructive feedback (including corrections - it's possible I've made an error or two!) from those of you who might find this useful or interesting. I appreciate many of you won't, in which case I'm happy to provide a full refund of the asking price
Last edited by BigMackCam; 11-26-2015 at 06:37 AM.