Its true that if two lenses come out equal, we will not know if there is
a difference in reality. The same thing could be said using film as
well. But I am confident that we have sufficient resolution in the 6Mp
sensor based on my experience.
It would be better of course if we could avoid Bayer interpolation and
the anti-aliasing filter. We are probably going to be shooting B&W
targets (at least some part of it), which would obviate the need for any
color interpretation. If I had to the time, I would write a simple
program to just extract the lumininance info from the raw data, after
all, white is white and black is black, and it would be obviouse despite
the RGB filter in front of the CCD. Of course the ideal would just be a
sensor dedicated to B&W. If there was a version of the *D with this, I
would buy it in a second.
rg
J. C. O'Connell wrote:
OK, thanks for the offer. You don't need to run
anything for me thank you. No, I don't know which
ones to try. But if I don't do a film test
how am I are going to know if the two highest
testing lenses with the same result are really
the same or one is better and the camera just cant
resolve that difference?
Thanks again,
jco
-----Original Message-----
From: Gonz [mailto:[EMAIL PROTECTED]
Sent: Monday, September 19, 2005 4:51 PM
To: [email protected]
Subject: Re: Pentax K 2.5/200mm
If you could give me an example, We can try to accomodate it given the
lens options that we have available to our test. There are several *
lenses in our lineup, and other non-* legendary lenses as well. I.e. I
don't know if there is a difference between the A* 300 2.8 and the FA*
300 2.8, but we will find out. They have different optical formulas.
If you know the answer to some of these differences on film, by all
means share. We will probably not do a film test, it just adds another
dimension we are not prepared to undertake right now.
rg
J. C. O'Connell wrote:
Ok, thanks for the feedback. Have you specifically
found ANY pair of OUTSTANDING lenses that you could see a difference
between the two on fine grain BW film but the istD was unable to
resolve the that difference? I say this because I am specifically
concerned about its ability to resolve the differences between the
finest lenses out there, not just see differences between excellent,
good, and fair lenses... jco
-----Original Message-----
From: Gonz [mailto:[EMAIL PROTECTED]
Sent: Monday, September 19, 2005 4:29 PM
To: [email protected]
Subject: Re: Pentax K 2.5/200mm
J. C. O'Connell wrote:
So now I will ask a question, is the resolution of the istD series
cameras high enough to tell the difference between an excellent and a
slightly better truly exception lens In the APS region it covers? Or
does at some point the resolution become "camera limited" and two
lenses both outstanding but slightly different performance become
"one" and these differences are not resolved at all as they clearly
would be on film grained BW film?
JCO
Oh you can tell the difference instantly. I've compared several
lenses
in the same focal range but different levels of quality and the results
speak for themselves. I'm about to undertake a more substantial project
with another PDML member to document lens characteristics of various
lenses.
rg
