Any Downloadable Lens Testing Charts On The Web?

Are there any downloadable lens testing charts available on the Internet?

I don't need anything exotic, I just would like to check for the sweet spot
and also would like to see how much pincushion or barrel distortion my
lenses have.

So, the simpler the better.

yes, lots of options, the easiest may be available at my pages at
http://medfmt.8k.com/mf/resolution.html using 1951 USAF images etc.

see http://medfmt.8k.com/mf/lenstest.html for misc. lens test notes;
my favorite is the chart by Roger Hicks on the effect of one stop
over-exposure in reducing lens resolution at the optimal f/stops by up to
20% - yet another got-cha in lens testing issues ;-)

hth bobm
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* Robert Monaghan POB 752182 Southern Methodist Univ. Dallas Tx 75275 *
********************Standard Disclaimers Apply*************************

Jeremy wrote:
: Are there any downloadable lens testing charts available on the Internet?

: I don't need anything exotic, I just would like to check for the sweet spot
: and also would like to see how much pincushion or barrel distortion my
: lenses have.

: So, the simpler the better.

You may want to consider a brick wall. It's flat so you can use it to check for the
"sweet spot" and the straight lines run both vertically and horizontally makes the
distortion easy to spot.

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Keep working millions on welfare depend on you
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"Frank Pittel" wrote in message
...

You may want to consider a brick wall. It's flat so you can use it to
check for the
"sweet spot" and the straight lines run both vertically and horizontally
makes the
distortion easy to spot.


I don't follow you--it it easy to determine the sweet spot when looking at a
brick wall? I thought it would require something with lines that were
closer together?

Jeremy wrote:

: "Frank Pittel" wrote in message
: ...
:
: You may want to consider a brick wall. It's flat so you can use it to
: check for the
: "sweet spot" and the straight lines run both vertically and horizontally
: makes the
: distortion easy to spot.
:

: I don't follow you--it it easy to determine the sweet spot when looking at a
: brick wall? I thought it would require something with lines that were
: closer together?

There's a lot of very fine detail in the bricks and the grout.


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Keep working millions on welfare depend on you
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