Lens test
Hmm ...., I know there are more interesting, but sometimes it is simply necessary. I must say that, I know all the rich sayings: "Here I am wasting my time ... but in time I can shoot again" or "as long as I see something in my pictures is all right and I take pictures". Well, everything is a matter of opinion. I have a different view!
If I bought a lens, I would like for the original purchase price and an acceptable and sound quality and not what is simply called rubber cucumber. Believe me, the differences and the dispersion of the lenses can be considerable and immense. From the outside, however, I can recognize a bad lens at an image quality not once, not even by a few photos from the balcony down, so I try here first.
While industry and editorial offices of individual photo magazines have enormous opportunities to test, it is for the private man is much harder to create opportunities here. But you need not despair, therefore. It is entirely possible with simple means to create at least one statement, whether one here has a good or bad lens in front of him. But once we go in medias res.
A good statement, what about the imaging performance of a lens, we already reach through cutting images of a 5-Euro vouchers. The fine delicate lines and good high-resolution print quality on the bill are actually likely to require the lens. In several single shots (from banking law reasons, you may not reproduce, but only at most 1 / 3 of the money note) and recorded at different apertures, we may well see if is tightly focused and committed in which the aperture sharpness.
Do you think this method is too trivial!
Well, we'll do our testing a little more sophisticated and measurable, above all things, known and with the Siemens star. In individual recordings, black/white and in JPG-format is made with various covers a number of shots. If you look at the pictures now - with the different apertures recorded - in an image editing program, the data sizes, so you will know that, even though it is the same design and same image, different file sizes are about. In plain language this means, in this and that solves the lens aperture, the lines still on and here or there, a little less. So at a designated higher file size, the image quality is considered higher. Again, in other words, more sharply distinguished the lens the more information are reflected in the image file and the greater will be the saved file.
With this method, image size, they may very well compare different lenses. If you now make a chart where you draw the file size of each aperture of the lenses and use for each lens in the diagram is another color, so you have already a very strong and meaningful-enabled profile created by the individual lenses. The different colored points can be set very well with a direct comparison of the lenses.
