Bob W wrote: >On 3 Nov 2013, at 17:59, Mark Roberts <postmas...@robertstech.com> wrote: >> >> Larry Colen wrote: >> >>> Yup he lists exactly the situation I said you would see effects in. Other >>> than >>> that has any one actually done any side by side testing to see if they see >>> any >>> differences? Or is it just more fun to argue without being hampered by >>> facts? >> >> Personally, I don't spend much time doing testing of this sort. I find >> sources I trust and I certainly trust Mike J for this kind of thing >> and go by their tests. I have experienced this kind of effect in >> real life (I was just editing some of my shots from Ireland this >> morning and found some examples of this caused by a polarizer in broad >> daylight). >> >>>> http://www.luminous-landscape.com/columns/sm-feb-05.shtml > >Mike J is a good, persuasive writer, and talks a lot of sense, but what makes >you think he's done any testing?
If you mean formal, controlled, scientific testing, nothing. But informal testing, his years of experience and less formal testing, plus my own replication of the effect is good enough for me. And likely is good enough for anyone whose purpose is real photography and not laboratory-level quantifying of the effects. For those who need MTF graphs, etc. for scientific measurements then formal tests with proper controls are in order. -- Mark Roberts - Photography & Multimedia www.robertstech.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
