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- Path: sparky!uunet!wupost!crcnis1.unl.edu!cse!kting
- From: kting@cse.unl.edu (Kea Ting)
- Newsgroups: rec.photo
- Subject: Re: Nikon N90, 28-70D lens - HELP
- Date: 20 Nov 1992 06:11:48 GMT
- Organization: University of Nebraska--Lincoln
- Lines: 29
- Distribution: world
- Message-ID: <1ehvj4INNk5u@crcnis1.unl.edu>
- References: <1992Nov20.035156.6835@leland.Stanford.EDU>
- NNTP-Posting-Host: cse.unl.edu
- Keywords: Vignetting, N90/F90, 28-70/3.5-4.5D AF lens
-
- krish@leland.Stanford.EDU (venkatraman) writes:
-
- >Well, it's a great camera and quite happy with it but I do have a
- >problem that I'm hoping that someone can explain. I seem to be experiencing
- >a whole lot of vignetting at 70mm when I use larger apertures. It
- >seems to start at about f16 and is very pronounced by f5.6 and f4-f3.5.
- >I shot a bunch of test slides and it's just too obvious to ignore.
-
- >BTW, I have a Nikon UV filter on the lens, I've tried both with and without
- >the Nikon hood recommended for the lens and it does not seem to be be
- >that pronounced at shorter zooms but then I haven't really tested for
- >it.
-
- >(Note the phenomenon I'm describing is a noticeable darkening of the
- >corners and I'm assuming that that's vignetting, do (!) correct me if
- >I'm wrong)
-
- Try to take off the UV filter and do some test ,
- the UV filter ring might be too thick. Try to test it withoud the filter
- and with the filter both at the 28mm and 70mm. If it is vignetting, the slide
- corner darkening at 28mm should be a lot more when compare with slide that
- take at 70mm.
- Good luck.
-
- --
- soon
-
- University Of Disclaimer :
- Nebraska-Lincoln I always speak for myself.
-