Norman koren lens test software

If resolution results with the 50x distances indicate greater than 100 lpmm are obtained the maximum which a 50x distance can report, i will ask that this lens be. Imatest is a useful program which allows you to make sophisticated plots of the system response function, which is simply the mtf of the lens multiplied by the mtf of the sensor. Canon ef lenses sharpness measured with imatest from qt. Norman koren founder, chief technology officer imatest llc. The comparisons between cameras are similar to those presented below, but the absolute values are different because a sharpening radius of 2 vs. Nov 09, 2004 the fixed lens camera market may be a bit niche, but its here that youll find some of the best cameras you can buy. Printer test images colour and monochrome images for testing. Jan 21, 2016 there are other lens attributes distortion, vignetting, chromatic aberrations, contrast, etc but for the most part these can addressed in post processing with software. By all means test with your own images too, but remember that if you are printing your own photo, then you are actually testing far more than just the printer. Basics photograph test chart standard or usercreated in controlled environment or as part of a scene. Optical testing i used norman korens imatest software to look at lens sharpness.

To make a really good copy of the chart, you need a pretty good inkjet printer. Canon ef lenses sharpness measured with imatest from. You obviously want the line at 0 to be the mostsharp in your test. Can you name a few names in the lens making industry. You also can look at the luminous landscape, other landscape sites, and norman koren s imagetest site. Imatest was founded by photographerengineer norman koren in boulder, colorado in 2004 to develop software for testing.

Apr 04, 2018 a couple of weeks ago i had an opportunity to visit norman koren, founder of imatest, llc. If resolution results with the 50x distances indicate greater than 100 lpmm are obtained the maximum which a 50x distance can report, i. Norman koren founded imatest in 2003 with a vision to transform the way people tested and validated their cameras. I process images with picture window pro, a superb program that deserves to be better known. Sensors ranging from apsc to fullframe are designed to match their lenses, which cover ranges from 2875mm equivalent, so image quality is topnotch. Ping is a computer network administration software utility used to test the reachability of a host on an internet protocol ip network. The test includes the camera and its sensor as well as the lens and the conversion software if one shoots raw. Lens flare veiling glare stray light bouncing between lens elements or off lens barrel interior. Lens testing our precision mtf test jig recently we designed and built a precision motion stage capable of focus adjustments to about 0. View norman korens profile on linkedin, the worlds largest professional community. You can also select a camera to see the results for all the lenses tested on it. I prefer the norman koren lens test targets for critical focusing test.

It measures the roundtrip time for messages sent from the originating host to a destination computer that are echoed back to the source. Welcome to my website, in which i share my passion for photography, my ideas, and even a visitors guide to boulder, colorado. Dxomarks 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. Thus, i place the emulsion face down and take advantage of silverfast flip function to get the image right into photoshop. The reason for using a slanted edge is to sample the brightness of pixels at distance increments of less than one. For digital cameras the sensor photosite spacing is a resolution limiting factor when testing an excellent quality lens. Based on a flexure design, so theres no bearings to rumble or cause misalignment.

See norman korens site for a detailed description of mtfs and pitfalls of it. Whether its still shots or video, visible light or infrared, imatest has helped businesses in a variety of industries, including mobile, automotive, medical and manufacturing. Norman koren has created a series of charts that will make testing your digiscope setup fairly easy. Imatest was founded by photographerengineer norman koren in boulder, colorado in 2004 to develop software for testing digital camera image quality using imatest software, a variety of image quality factors can be analyzed including image sharpness, color response, noise, dynamic. An edmund scientific lens resolution chart with several overlain koren 2003 lens test.

Norman koren, imatest founder and cto, imatest llc, boulder, colorado image quality is a term widely used by industries that put cameras in their products, but what is image quality. The opensource, freeware imagej aka nih image software was used on the test images with a plot profile feature that allows a line to be drawn across the bar pattern to determine the contrast of each line pair in the pattern. Ive read the norman koren tutorial on the subject a few times and he offers up a test chart as well as some links to others some are dead, however. Detailed analysis of the canon eos5d images, from imatesttm ive recently begun using norman korens excellent imatest analysis program for quantitative, thoroughly objective analysis of. Resolution testing with norman korens lens test chart. Using imatest software, a variety of image quality factors can be analyzed including image sharpness, color response, noise, dynamic range, tonal response, lens flare, lens distortion, lens. Nov 26, 20 several websites provided useful information about slanted edge tests. A4 monochrome test image for print evaluation latest 2014 version explanatory article. The sharpness of a photographic imaging system or of a component of the system lens, film, image sensor, scanner, enlarging lens, etc. Imatest is used by a great many companies to develop and test digital cameras, and is now working 247 in.

You should check norman koren site for tips on conducting scan tests so you adjust your holders height for best focus accuracy. The norman koren test chart was imaged with the bigshot camera and the nikon camera. I did not want to spend a bunch of money on printed targets and evaluation software, so i used the recipe outlined by norman koren in a tutorial that is posted on his website. Norman korens lens test chart the koren chart was described previously, but another few items are worth noting. In the simple distortion module, shot on a different target, the results from the three lenses came out between 0. See the complete profile on linkedin and discover normans. In their page, understanding the mtf graphs, numbers and grades, they state. Interview with norman koren of imatest photography life. A couple of weeks ago i had an opportunity to visit norman koren, founder of imatest, llc.

Several websites provided useful information about slanted edge tests. The chart was photographed under tungsten bulb lighting from two modeling lights. You can also select a camera to see the results for all the lenses. Feb 16, 2007 see norman koren s site for a detailed description of mtfs and pitfalls of it. The imaged sine patterns were analyzed with imagej software and. Resolution and mtf curves in film and lenses norman koren. Where can i download a lens test chart canon slr lens. Most of my work since then has been done on the canon eos10d, 20d, 40d, and 6d, the panasonic lumix dmcg3 and lx100, and the sony a7rii.

Of course the mirror lens is a stop slower, manual focus, isnt a zoom and has donut shaped out of focus highlights poor bokeh. Imatest was founded by photographerengineer norman koren in boulder, colorado in 2004 to develop software for testing digital camera image quality. Lens makers and lens component makers are also using imatest as a part of their evaluation and testing process. The names are not that big in lens making, because the two really big companies nikon and canon have their own software, which traditionally has been a part of their advantage.

In interactive mode, the software calculates all the imagequality factors available on the test chart and displays the results graphically. Robert monaghans detailed printable pdf version and its variants have been a standard for half a century. The mtf curves on the right are from the photodo old site test of the canon 2870mm f2. May 23, 2015 however, the nice people at imatest have given me an imatest master license for their wonderful image testing software thanks norman koren and ive just had a 4ft by 7ft lens testing chart printed on dibond by digitalab. You also can look at the luminous landscape, other landscape sites, and norman korens imagetest site. Nov 26, 2010 the af1951 target you can find online and print for free, or whatever you are shooting, should give you a decent idea of how well the lens resolves. He also sells a lens test kit based on a modified usaf 1951 test chart. The usual reference is the united states air force lens test chart, but there are variations on this and he suggests that its inappropriate for digital tests and offers up his own. Norman koren founder, chief technology officer imatest. One is that the test chart is presented such that an mtf 50% sample strip is provided on the chart at about 10 linesmm spatial resolution for comparing. Recently we designed and built a precision motion stage capable of focus adjustments to about 0. Sharpness is arguably the most important imagequality factor as it is most closely related to the amount of detail an image can render. I deal more with large format gear and have encountered lens that would hold infinity focus wide open for. The above example was shot with the canon eos 5d mark ii and canon ef 200mm f2 l is usm lens at f2 using tungsten studio lights.

We routinely use norman korens excellent imatest analysis program for quantitative, thoroughly objective analysis of digicam test images. Imatest has become the world leader in software and tools for analyzing. Bob atkins, the busy director of the nature photography pages, had a page on technical optics that covers lens testing. Since july 2003 i have been working more than full time on imatest, so much of this website is outofdate. Or you can buy detailed and pricey mutiple test charts like the edmund 58940. Printed test charts were placed on the edmund scientific test chart as in the middle and edge of the chart as shown here. Optical testing i used norman koren s imatest software to look at lens sharpness. Imatest is a software package that allows you to measure lens sharpness and digital camera performance using inexpensive easilyavailable targets. This changed in 2004, when norman koren released his first version of imatest, a software to automate digital image quality measurement. An edmund scientific lens resolution chart was illuminated with a monolight flash. Imatest provides customers with software, charts and equipment to meet and exceed. We present a unique visual explanation of mtf and how it relates to image quality. For film, these tests provide an approximate estimate of the 50% and 10% mtf frequencies far from. I used the koren 2003 lens test chart developed and explained by norman koren to calculate 50% mtf.

Note should you do your own testing with imagetest you will need to test one lens multiple times over several days to get your procedure down pat. Manipulation is limited to dodging, burning, and adjusting color and contrast. Since a pinhole does not let in much light, exposure times will be much longer for a pinhole camera than for a camera with a normal lens. You still need to set up the target shots carefully, but now you just input sets of digital images into the software, and then read measurements. Note also that focus target distance field subject test distance were maintained as a near constant for the subject lensbody system tested. There is no perfect lens test, either lens rentals blog. I have looked into different test patterns and prefer the one from norman koren in stevees post above. I think that is best for normal lens testing distances. Detailed analysis of the canon eos5d images, from imatesttm ive recently begun using norman koren s excellent imatest analysis program for quantitative, thoroughly objective analysis of. Prior to april 2003, all my images were captured on film and scanned. Therefore, you must use a digital camera that provides a method for controlling long exposures e. Whether its still shots or video, visible light or infrared, imatest has helped businesses in a variety of industries, including mobile, automotive, medical and. Imatest gives companies the right tools to test their image capture technology and has been a leader in image quality testing for over 10 years.

Initially focused on photographers with robust software to visualize the effect of. One is that the test chart is presented such that an mtf 50% sample strip is provided on the chart at about 10 linesmm spatial resolution for comparing against the line pairs at the critical frequency. Raw files were converted to 300 dpi tifs with phase one dslr software and. Jul 11, 2016 view norman korens profile on linkedin, the worlds largest professional community. Norman koren, imatest founder and cto, imatest llc, boulder, colorado image quality is a term widely used by industries that put cameras in their products, but. Yes, that is 500nm, or about the wavelength of green light. Oct 10, 20 in all cases the same test devicesoftware, test procedures altered as required for lens focal length and lighting conditions were used. If you want more detail, norman koren has posted some downloadable test charts along with detailed instructions for using them. Photodo is an outstanding internet lens test resource, with 458 lenses optically mtf tested as of june 2000. In all cases the same test devicesoftware, test procedures altered as required for lens focal length and lighting conditions were used. How can ishould i check the sharpness of my camera lens. Images were captured of an international organization for standardization iso 12233 standardized test target, a validated instrument for measuring camera resolution, with a canon eos 1n film camera and a canon eos 1ds mark ii digital camera tokyo, japan. Norman koren founded imatest in 2003 with a vision to transform the way.

An objective comparison of 35mm film and digital camera. December 27, 2016 december 27, 2016 henry koren gamma, chart contrast and mtf calculations gamma the average slope of log pixel levels as a function of log exposure for light through dark gray tones is used, per the iso 12233 standard, to linearize the input data, i. For the lightbox camera described, exposure times may need to be tens of. Imatest llc is a company that produces image quality testing software and offers a range of consulting services. The af1951 target you can find online and print for free, or whatever you are shooting, should give you a decent idea of how well the lens resolves. View norman korens profile on linkedin, the worlds largest professional. Making such tests is yet another of my stalled projects, i hope to eventually restart.