Download Lens Test Chart
Sasha Stolt
DXOMARK's comprehensive camera lens test result database allows you to browse and select lenses for comparison based on their characteristics, brand, price, lens type, lens size, focal range and aperture. You can also select a camera to see the results for all the lenses tested on it.
With DXOMARK you can display the lenses with three different views - Grid, List or Graph in order for you to have the best solution to compare the filtered results. Choose the lenses you want to compare from the results below. Then in the selection box, you can check up to three lenses at a time to compare their measurements.
When you simply google 'print lens test chart PDF', a whole lot of links come up. The first one offers an A3-sized chart at 300 dpi. But there are many more. Alternatively, maybe you can download a Siemens star chart in vector format so that resolution is no longer an issue?
I use the ISO12233. Printed A3+ size on my photo printer on photo paper, and mounted onto a cardboard. I do not have any lenses that need bigger resolution. But you got to use a good printer, and good paper of course, and good genuine ink else it will fade out in just a few weeks and become useless.
If the resolution is insufficient for your purposes, simply print 4 of them in A3+, and mount them 2x side by side and 2x top to bottom onto a cardboard or a plywood. Now it is 4 times the area at the same resolution. Should be plenty for any lens imaginable, even if the printer was not the best.
Tom, Though not shooting m43 Jim Kasson is an excellent source of information regarding lens testing. This page gives an intro into his methods. He is all about science so can deep dive a bit but overall a fantastic resource .
If you want to test say your 100-400 at 400mm, you got to put that test chart on a scaffold, maybe 15 or 20m away so it fills the frame at a determined exact scale, in the sun so that it has a good contrast. If you can't do that accurately, you can put a ruler on the test chart that you can then measure on the picture to determine the exact scale.
You use a test chart, because you want to determine lines per millimeter. That is an absolute figure. After all, you would not try to measure the diameter of a watch pin with a rusty old caliper either, would you?
If you do not need to measure absolute resolution figures, you can use other things than test charts to get a feel for how sharp a lens is. Often you just want to compare two lenses, that you can do with anything like a newspaper sheet. Or you want to see if a lens id de-centered, field curvature, or whatever, that you can do with a newspaper too. You have not told us yet what it is you want to do or achieve.
Flare seems to be a bit of a weakness with Laowa lenses , it can be an issue if shooting the wrong subject On my otherwise fantastic 100mm 2x maco. I think I have seen it mentioned in a few other reviews of different Laowa lens. Once you know about the issue you can generally work around it
Reviewers often test flare by having the sun inside or just outside the field of view and looking for artefacts. Veiling glare happens where you have light spilling from a bright area (like a window) into a dark one. They seem to have different but related physical causes, so a lens with veiling glare tends to flare but not necessarily that badly.
westin/misc/res-chart.html is a scalable vector graphic. It has no inherent resolution. You make it as big as you need. I print this in tiled sections on a laser printer to provide more appropriately sized charts for wide angles lenses.
With the 2x macro it is not such a challenge as the typical shooting scenarios are not really the ones that are likely to show this. I have seen it but only really when I was testing it out. It is an excellent performer otherwise. I use the Nikon Z 105 more for the convenience of focus stacking etc. I think Laowa still has a m43 50mm x2 macro though I have not seen much about it in the forum
If you want a compact camera that produces great quality photos without the hassle of changing lenses, there are plenty of choices available for every budget. Read on to find out which portable enthusiast compacts are our favorites.
For our DxOMark lens reviews, we evaluate the performance of interchangeable lenses for cameras equipped with sensors that can capture images in RAW format. In this article, we explain how we test for different criteria in the DxOMark image quality test lab and how the test results translate into sub-scores and the final DxOMark lens score.
We use the sub-scores for the criteria above to compute the final DxOMark lens score. The score shows the amount of information captured by the lens on a given camera and how well the camera and lens perform together. However, the score does not reflect the intrinsic quality of the camera sensor.
The Modulation Transfer Function (MTF) of a camera (body and lens) is measured in line with the ISO 12233 standard SFR method (see MTF measurement definition). The target is a pattern of white and black squares tilted at a 5 angle and filling the field of the camera. DxO Labs designed the target and produced it using a high-resolution printer to achieve sharp transitions between black and white areas without aliasing. The target is attached to a frame made with aluminum profiles to provide the necessary rigidity to the target assembly.
3a7c801d34