Tested some Toyo close up filters on this stock this morning, and on finishing processing went back to look at one of the reference shots taken at f8. I've found so far with this less that less processing is often better but was surprised to find that this photo had not been processed at all. I downsized it and tried sharpening but that looked worse. So I've just converted to higher quality JPEG. I tried the Toyo filters with my Cosinas last year and didn't think much of the results. They did seem to go better with this lens - I've loaded one photo taken with an ext tube and one with a +4 filter, both wide open, next to this one on Flickr;