AG Schnozz wrote:
> I've just been working on some lens testing of my various
> Olympus lenses on the E-1.
>
> Using the USAF line-pair test chart, I photographed it using my
> collection of lenses using the same chart-size (filling the
> viewfinder). I had the chart taped to the side of my house in
> direct sunlight and used every common F-stop from F4-F22 (if the
> lens supported it). In a couple of instances, I did also do a
> wide-open test.
>
> I was a touch lazy in the summer heat and just used a monopod,
> but the shutter speeds never dropped below 1/250, so I was
> pretty safe. Aperture priority exposure mode. If I feel like
> doing this again, I'll use a tripod. Also, I used JPEG HQ mode
> with +2 sharpening. No halos visible. In comparative testing,
> I've found an increase of about one line pair when shooting RAW.
> So these measurements are relative to a best possible in JPEG HQ
> mode.
>
> First things first. The DZ 14-54 lens is as good if not better
> than any of my prime lenses when it comes to sharpness and
> contrast. Therefore, there really is no gain to shoot with the
> prime lenses in any focal length the DZ covers. However,
> distortion, and symmetry is a touch better with the old Zuikos.
> There are other issues at play too, but for pure resolution, the
> DZ 14-54 is outstandng. I'll get into specifics on the website
> where I'll post samples of each focal length and aperture, but
> I'm summarizing here with my comments.
>
> A measurement of -1 LP means that it resolved one less line-pair
> from the best image possible (in this test). As no lens or
> setting exceeded my best possible, I believe I hit the AA filter
> and process engine limits. -2 LP would be two line-pairs less.
> For a point of comparison, the limit is the sixth "6" LP in my
> test chart.
---------------------------------------
Interesting stuff and nice to know that the 14-54 and modern lens technology
really is better (at least in some respects) than the old stuff. But I didn't
undertand the last sentence above ("the limit is the sixth, etc.") and I was
expecting to find the base line resolution from which all these -1 and -2
deltas
were meaured. What don't I understand or what did I miss?
Chuck Norcutt
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|