Zeiss siemens star chart pdf series#

Wide angle lenses for A7 series cameras.

Leica Summicron 90mm 2.0 pre Asph Review.

It is a more complicated business than you might have guessed. We can also highly recommend Roger Cicala’s article on optical quality assurance. You might want to consider returning this or have it serviced. This one is badly decentered in a way that it might actually have a visible influence on your results. One corner is very slightly worse, but this will be pretty much unnoticeable.

This is pretty much as good as it gets, there is almost no variation. To check centering you need to compare the corners to each other, not compare the corners to the center.

If your lens has field curvature the corners will look worse than the center.

When testing zooms for decentering you should do it at the extremes and in the middle.

Zooms are more prone to decentering, compared to primes you should lower your standard a bit.

Usually fast and wide lenses are more prone to decentering.

Zeiss for example has significantly better quality control than Sony, but no manufacturer is perfect.

Every manufacturer ships decentered lenses, but some are worse than others.

You will have to decide if what you see is an issue for you or not and if you can expect to find a better copy.

A perfectly centered lens does not exist and a very slight decentering you will only rarely if ever notice in your pictures.

You check for yourself to see if you are okay with it and not to see what we think. We are neither your free-lens-checking-service nor your lens manufacturer’s quality assurance team.

This is the most important one: do not send us your shots and ask if we think your lens is okay.

Move your camera on the ballhead until your target is in one of the extreme corners of the frame and take the shotĬhimney in upper right corner Chimney in lower left cornerīefore you rate your shots there are a few things to consider:.

You put your target in the center of the frame and you focus on it.įocus is on the chimney in the center of the frame.

electronic first curtain shutter off (if you have a stable tripod).use the widest aperture of your lens (some lenses have very bad corner performance, stop these down until there is visible detail in the corners).Some building far away (chimney, antenna, church tower etc.).This test was published by the German Gletscherbruch homepage, but as this website is only available in German we decided to write an English version. If you know how it works it will take you less than 5 minutes per lens!

Zeiss siemens star chart pdf how to#

In this article we will show you how to easily test your lenses for proper centering. You may have already heard of sample variation or decentered lenses.