Hi again Rick, the first one is the one I recall seeing from your original posting about the issue - IIRC you also experimented with white point etc. But it was good of you to answer since I was lacking the ambient light bit, around here it is all artificial so I'll walk a few paces to one of the backside canals.
Cheers Ecke 2010/7/2 Rick Womer <[email protected]>: > Ecke, > > I'm not sure what you mean by "worst parameters". Here's an example, though: > > http://photo.net/photodb/photo?photo_id=10151334 > > (ISO 1600, f/3.5 @ 1/3 sec) > > And another: > > http://photo.net/photodb/photo?photo_id=9202604 > > (ISO 1600, f/4 @ 1/30) > > What these two photos share is ISO 1600 and natural dusk light. ISO 1600 pix > taken in artificial light (e.g. downtown Chicago pix) don't have magenta > concrete. > > Cheers, > > Rick > > http://photo.net/photos/RickW > > > --- On Thu, 7/1/10, eckinator <[email protected]> wrote: > >> From: eckinator <[email protected]> >> Subject: Re: filter enablement and cleaning >> To: "Pentax-Discuss Mail List" <[email protected]> >> Date: Thursday, July 1, 2010, 5:07 PM >> Rick, >> >> I'll happily let you know. Since you've spent more time >> looking into >> it, what are the worst parameters regarding magenta >> concrete? >> >> Cheers >> Ecke >> >> 2010/7/1 Rick Womer <[email protected]>: >> > Ecke, >> > >> > I will be very interested to know if the new filter >> eliminates the magenta concrete. That and VPN in dark >> skies are the two biggest problems with nocturnal >> photography with my K10D. >> > >> > Rick >> > >> > http://photo.net/photos/RickW >> > >> > >> > --- On Thu, 7/1/10, eckinator <[email protected]> >> wrote: >> > >> > >> >> hi gang >> >> >> >> maybe this is old news to most of you but I >> thought I'd >> >> post it anyway >> >> in case it isn't >> >> >> >> got my recent aby steal, a B+W UV/IR-CUT filter in >> the mail >> >> today and >> >> replaced the Hoya Pro1 Digital MRC UV filter used >> so far >> >> which despite >> >> frequent old school cleaning - give it a good >> moist breath >> >> and wipe it >> >> with a piece of microfibre cloth - had lots of >> spots and >> >> fingerprint >> >> residue etc on it. I remember reading somewhere >> Hoyas have >> >> a bad rep >> >> for being hard to clean and so I broke out the >> lens >> >> cleaning liquid >> >> and a bunch of other stuff and the result was >> invariably a >> >> colorful >> >> smeary mess looking something like a wet oil stain >> in the >> >> street if >> >> you know what I mean. Tried helmet visor cleaning >> tissue >> >> next, >> >> eyeglass cleaning tissue, Olympus silicone >> impregnated lens >> >> cleaning >> >> parchment and everything I could think of. Same >> mess every >> >> time. >> >> >> >> So I quit and googled "cleaning Hoya filters" >> thinking, >> >> "heck I'll ask >> >> PDML if I can't find anything". >> >> >> >> Sure enough the first result was >> >> http://www.hoyafilter.com/products/hoya/coatings.html >> >> where it says >> >> "Never use any chemicals, such as lens cleaning >> fluid, on >> >> your >> >> filters, as these can damage the coatings. If any >> stubborn >> >> stains >> >> occur, these can usually be washed off with some >> clean >> >> water and a >> >> soft cotton cloth." >> >> Big OUCH, I had used all apparently suitable >> chemicals at >> >> my >> >> disposal... so I let it soak in water for a while, >> found a >> >> clean >> >> cotton kitchen towel and gently rubbed. Some came >> off, some >> >> didn't so >> >> I rubbed harder, figuring the filter was probably >> ruined >> >> anyway. But >> >> guess what, every single stain came off, there is >> no lint >> >> on the >> >> filter, no scratches, no cleaning marks no matter >> which way >> >> or side I >> >> hold it into the light, under a light or shine one >> across >> >> it. It looks >> >> absolutely like new. I can't find a single fault. >> >> >> >> BTW I bought the B+W to test the claim that the >> K10D's AA >> >> filter's IR >> >> suppression is weak and that the filter will >> prevent color >> >> casts >> >> ("magenta concrete") in darker image areas. There >> won't be >> >> a newer >> >> Pentax for me in the near future so I have to >> squeeze the >> >> best out of >> >> what I have. If there is anything to report, I >> will pass it >> >> on, if you >> >> don't hear from me about this again I wasted a >> couple of >> >> Euros. >> >> >> >> Cheers >> >> Ecke >> >> >> >> -- >> >> PDML Pentax-Discuss Mail List >> >> [email protected] >> >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> >> to UNSUBSCRIBE from the PDML, please visit the >> link >> >> directly above and follow the directions. >> >> >> > >> > >> > >> > >> > >> > -- >> > PDML Pentax-Discuss Mail List >> > [email protected] >> > http://pdml.net/mailman/listinfo/pdml_pdml.net >> > to UNSUBSCRIBE from the PDML, please visit the link >> directly above and follow the directions. >> > >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link >> directly above and follow the directions. >> > > > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
