testing lenses for "bad" samples
Recently, I've noticed that in some messages people remark about a lens being a "bad" sample. My question is what do you have to do to see this besides shooting a roll of film with it? What would you look for in the photos? In addition, is there anything on the lens itself that would lead someone to believe that a lens is a "bad" sample? My question involves only Nikkor lenses. If anyone has seen a "bad" lens, specifically a 28-105 or a 70-300, please reply. Actually, any advice would be most welcome.
The Fontana Nikonian (It's near Ranchoooo Cucamonga :-) )
Life is like a photo...
It's how you see it that makes the difference
"Professional photographers are predictable; the world is full of dangerous amateurs" - Murphy's Law for Photography
#1. "RE: testing lenses for "bad" samples" | In response to Reply # 0
You cannot judge the performance of lens by just looking at it, or by shooting a roll of film and looking at 10cmx15cm photos.
In order to evaluate a lens to be a "bad sample" , meaning that its performance in general deviates significantly from the statistic mean of the series , you have to perform controled tests with resolution targets.
As far as I know Nikkors are well matched in terms of colour redition , field illumination and contrast.This cannot be said for some of the 35mm-to-X zooms that have more than allowed sample to sample variation.
#2. "RE: testing lenses for "bad" samples" | In response to Reply # 0krf Charter MemberMon 27-Aug-01 09:33 PM
What most people are referring to as a "bad" lens is one with specks of dust on an inside element or a slight flaw in the coating on an outside element. In most cases, these imperfections do not visibly affect the quality of images produced, but do tend to irritate the owner of the lens.
Visit my Nikonians gallery.
#3. "RE: testing lenses for "bad" samples" | In response to Reply # 2
LAST EDITED ON Aug-28-01 AT 12:03 PM (GMT)
What David was referring to was a "bad sample" , not a "bad" lens.
You can have an immaculate , clean brand new lens without a single spot of dust on any element of the lens and yet the lens can be a "bad sample" thus not performing as it should due to subtle manufacturing faults.