uncleflo

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Some cool dude. Higher order of decision making. Absolute.

Registered since September 28th, 2017

Has a total of 3439 bookmarks.

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Tag selected: optical.

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How to Test Your Lens | B&H Explora

https://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-to-test-your-lens

Saved by uncleflo on January 6th, 2019.

So, you just bought a shiny, new, and maybe expensive, lens for your camera, and being the savvy consumer, you did your homework. You pored over customer reviews on the B&H Photo website, read online reviews splattered all over the Internet, grabbed a copy of every photo magazine that reviewed the lens, bookmarked dozens of websites, and now have the lens’s MTF curve charts burned into your retinas. Now, your lens is here and it is time to go out shooting. Honestly, not a problem. Your lens should be as good as it can be and, as photographers, we want to take photos. So, stop reading and go out and make some photographs! Still here? OK, let me tell you why you might want to test that lens yourself. The main reason is that even with today's precision computer-controlled manufacturing techniques, there are variations in each and every lens that rolls off an assembly line. This means that some examples will be better than others. Some lenses will be outstanding and others will make you wonder if all of those glowing reviews you read online were completely bogus.

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Lens Tests: A Simple Method

http://www.zen20934.zen.co.uk/photography/LensTests/simplemethod.htm

Saved by uncleflo on January 6th, 2019.

This is a simplified subjective method of testing lenses optical sharpness. This should not be confused with tests for focus accuracy and discrimination in a 3D environment, that is a totally different issue although often confused by the inexperienced. A focus accuracy test is suggested here Focus Test. The advantage over this method, compared to just taking a shot of a garden etc, is elimination of variables such as subject and camera movement, insufficient depth of field, flatness of field and variations in focus location. It uses a nice consistent high contrast subject to make comparisons easy; checking sharpness on general photographic views is not very easy. As the method is subjective, it is worth testing against a known good lens for comparison.

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ISO 12233 Test Chart

https://stephen-westin.com/misc/res-chart.html

Saved by uncleflo on January 6th, 2019.

In 2000, the International Standards Organization adopted ISO Standard 12233: Photography -- Electronic still-picture cameras - Resolution measurements for the measurement of camera resolution. This standard is protected by copyright, but the design of the associated test chart seems not to be protected; its description has been available on the Web in an Excel spreadsheet. I have semi-manually converted this to an Adobe Illustrator file which is displayed here. In 2014 and again in 2017, the ISO revised the standard and the chart below was replaced by several new ones. Those new charts are not available here. In principle, you should be able to print this chart and perform resolution tests on your camera. The reality isn't that simple; there are lots of subtleties having to do with focus distance, quality and contrast of your printer, evenness of illumination, surface reflections, etc.

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Canon EF 28-300mm f/3.5-5.6L IS USM Lens

http://www.bhphotovideo.com/c/product/319784-USA/Canon_9322A002AA_28_300mm_f_3_5_5_6L_IS_USM.html

Saved by uncleflo on July 23rd, 2016.

The EF 28-300mm f/3.5-5.6L IS USM Lens from Canon is an all-in-one zoom lens for versatile and easy subject selection for multiple photographic applications. This lens offers the highest optical performance in its class, plus the convenience of focusing as close as 2.3 feet over the entire zooming range.

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Diamond Properties

http://www.chm.bris.ac.uk/motm/diamond/diamprop.htm

Saved by uncleflo on April 4th, 2015.

Choose virtually any characteristic of a material - electronic, structural, or optical - and the value associated with diamond will almost always be the most extreme: Diamond is invariably 'the biggest and the best'. The following is a table of the properties of diamond that render it so potentially useful across many fields of science (Ref. 'Synthetic Diamond - Emerging CVD Science and Technology', Spear and Dismukes, Wiley, NY, 1994).

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The Truthful Mouse Guide

http://www.overclock.net/t/951894/the-truthful-mouse-guide

Saved by uncleflo on May 16th, 2013.

I know that there is a CS:S Mouse Optimization Guide already stickied in the forum but I decided to make my own mouse guide because I felt that there were simply a few things left unsaid/misunderstood.

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