On Sun, 28 Mar 2004 18:30:42 Konstantinos Bibis <[EMAIL PROTECTED]> wrote:
> - ------------------- > > What is the difference between the B&W UV uncoated vs the B&W UV multi > > coated filter? Will it make a difference in picture quality on a Canon > > consumer EF 75-300 f/4-5.6 III? > >=20 > > -------------------------------------------- > > I have a similar question. Some people argue that a UV can protect > the lens and some others that putting anything in front of your lens > knocks points off performance. I've read stories that people had > focusing problems with certain UV filters. > I recently got the Sigma 70-200 /2.8 HSM and thinking wether i > should use a UV. At the moment i don't;but i'm using the hood that > came with it for protection as well. But still i'm uncomfortable when > handling with the thought that front element mayu be scratched or > when i have to clean it to get the dust off i scratch it by cleaning it > or something like that. Has anybody solid experience of a decent > quality (Hoya,Sigma or BW) (multicoated?) filter causing any focusing > problems or image quality degradation ? Hi Konstantinos, I know there are widely differing opinions on this, but my take is simple. A filter, even an expensive multicoated filter, is a lot less expensive than my lenses. Therefore I always use a UV filter. Except of course if I'm using a polarizer ;-) I always (well nearly always) buy filters with good multicoating to ensure that the filter doesn't become a source of flare. I've found that Hoya HMC and HMC-Supers are excellent. Another good filter range are the Pentax SMC filters (they also have brass filter rings too). B+W are good, but multicoated B+Ws are pretty expensive. A good MC filter doesn't detract from the images enough for me to even consider not using one.... Your other question about focusing problems may relate not to UV filters but to polarizers. A guy I know had a 75-300 Canon lens that he said wouldn't AF with a polarizer on. He wanted to know if it made it too dark or something. The polarizer it turns out was NOT a circular polarizer, but a linear one. AF cameras can get very confused when a linear polarizer is mounted on the lens. Actually the metering systems can get confused too.... Haven't heard of any AF problems relating to UV filters though, coated or otherwise. Cheers Gary This message has passed through an insecure network. All enquiries should be directed to the message author * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
