uncleflo

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

Registered since September 28th, 2017

Has a total of 3459 bookmarks.

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Tag selected: precise.

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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.

sharpness histogram sharpen broadsheet flatness clipping lens stabilizer timer infinity check focal pixel recommend exposure adjust compensate focus filter optical hardware camera comparison accuracy precise precision photo photography test testing environment confuse compare equipment standard quality


The Making of a Marble Sculpture

https://www.youtube.com/watch?v=gyWeksAo8VM

Saved by uncleflo on October 28th, 2018.

Demonstration of how to create a sculpture from an existing sculpture, by very talented artists in Italy, on marble stone. The large stone is first cut by a hand saw machine to get rid of the larger pieces. The stone is then chivelled by to nearby precision. A poke pointer and precision hole sawing than marks exact depth holes and marks where the statue surface should be. The statue is then passed on to another expert, who takes the time to very precisely sculpt and smooth the final layers to the final statue.

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Blargh - gettimeofday() should never be used to measure time

http://blog.habets.pp.se/2010/09/gettimeofday-should-never-be-used-to-measure-time

Saved by uncleflo on June 17th, 2013.

gettimeofday() and time() should only be used to get the current time if the current wall-clock time is actually what you want. They should never be used to measure time or schedule an event X time into the future. What's the problem? gettimeofday() returns the current wall clock time and timezone. time() returns a subset of this info (only whole seconds, and not timezone). Using these functions in order to measure the passage of time (how long an operation took) therefore seems like a no-brainer. After all, in real life you measure by checking your watch before and after the operation.

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Avago Technologies - AEAT-86AD-LCSF0 - High Temp Multi-turn Encoder Module with Built-in Controller, 14-Bit, Gray

http://www.avagotech.com/products/motion_control_solutions/absolute_encoders/multi-turn_modules/aeat-86ad-lcsf0/

Saved by uncleflo on May 11th, 2008.

The AEAT-86AD provides all functions as an optoelectronic mechanical unit in order to implement, with single turn absolute encoder, an absolute multi-turn encoder with a combined capacity of up to 30 bits at extended temperature.

high-definition temperature precise rotation electronics encoder digital


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