it might also be a problem of the lens without having to blame the
filter for it
Joseph Chamberlain, DDS wrote:
I am using the slim filter from Heliopan which is the thinnest one they have
available and specially made for wide angle lenses.
My reasoning behind the coating question was based on the assumption that
the more light gets reflected off the surface of the filter, the less light
will be available to pass through. This compounded by the curvature of the
lens towards the edges could create a significant reduction of light on the
borders of the image. No ?
The only filter I have seen that is slimmer than the one I am using is the
B+W. However, there is a price to be paid. B+W slim filters are so thin that
they don't have threads on the outside thus preventing a lens cap from being
placed in front of the lens.
I am going to run some tests as Laurenz suggested and see what the
difference is. I have always been skeptical about using lenses (specially
the more expensive ones) without a filter as protection. But in this
particular case I just might have to open an exception.
Joseph
---
Dr. Joseph Chamberlain
Oral and Maxillofacial Surgery
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On 11/15/05 10:01 AM, "Gregory Fraser" <Gregory.Fraser@xxxxxxxxxxx> wrote:
My impression is that this is being cause (at least in
part) by the filter I
am using. When I purchase my camera I asked for Heliopan
multicoated UV
filters for both lenses.
Seriously speaking, would cheaper coating cause vignetting? If so then
wouldn't no coating at all (or no filter) cause even more vignetting?
Are you using the slim or super-slim filters designed for wide angle lenses or
are you using the regular, thicker filters?
Greg
--
Pablo Coronel R. Ph.D. Research Associate Department of Food Science
North Carolina State University Room 14B Schaub Hall, Box 7624 Raleigh,
NC, 27695 Phone (919) 513-8077 Fax (919) 515-7124 e-Fax (419) 818-7590
e-mail pcorone@xxxxxxxxxxxxxx http://www4.ncsu.edu/~pcorone
