Quote Originally Posted by Field View Post
Orange filter vs. no filter OM2n 28mm f3.5 lens.

http://www.flickr.com/photos/6222653...7629961032651/

That was at 6.75 in Tmax 1:4. Clearly no filter needs even more time... so far only the yellow filter seems worth using. I'm not sure how much to increase development for EI25 filterless, but everything is vastly blown out.
Yeah that orange is really contrasty, and no filter was too weak, looks like great filters are the standard yellow #8 (K2) and Mark tried a #12, which also looked great. I suppose a 9 and 11 wd be grand too, not sure much more than the #12 wd work out as swell as those between 8 and 12?