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.
