take a shot of blank wall onto a test sheet of film or paper. See if the spot shows up. It won't, because the filter glass is so out of focus on the film.
take a shot of blank wall onto a test sheet of film or paper. See if the spot shows up. It won't, because the filter glass is so out of focus on the film.
Science is what we understand well enough to explain to a computer. Art is everything else we do.
--A=B by Petkovšek et. al.
Specks on the glass will be completely out of focus and you will never see them
Shoot a test
Flikr Photos Here: https://www.flickr.com/photos/18134483@N04/
“The secret of getting ahead is getting started.”
― Mark Twain
Thank you very much!
I read this post because I was interested in purchasing a ND center filter for my Schneider super-angulon 90mm f/8 lens. After reading the posts there seems to be some confusion on terminology. The pictures taken by prince fritz first show the correct appearance for a ND center filter - darker in the center and gradually lightening to the periphery. An ordinary ND filter is uniformly "dark" from center to edge. These are different filter for different uses. Ordinary ND reduces light to allow longer exposures or bring very bright scenes closer to the exposure range of the film used. ND center filters are used because of the fairly dramatic light drop off of wide angle lenses from center to edge. These ND center filters even out the amount of light striking the film from center to edge. Think of these filters as graduated filters but instead of upper and lower gradation, these are center to edge graduated.
+1
center nd filters are designed to be darker in the center and taper off at the edges.
Posting Permissions
Reply With Quote
Bookmarks